A review on high-performance flexible thermoelectrics: material, device, and applications

Abstract

Flexible thermoelectric (TE) materials and their devices have gained increasing attention due to the flexibility and lightness of flexible TE technology for low-temperature waste heat collection. In recent decades, various efforts have been devoted to the impressive efficiency of flexible TE technology including the synthesis, design, and integration of flexible TE generators. In this regard, the urgent need for eco-friendly, stable, and durable power sources motivates the booming market for integrated electronics. This review comprehensively summarizes the state-of-the-art development of flexible TE materials, device types, fabrication techniques, and the fundamentals behind their applications. In addition, the employed methods for moderate physical properties including theoretical analysis, experimental prospects, and importantly the challenges of flexible TEs are introduced. Moreover, we summarized the applications of flexible TEs in textiles, wearable electronics, waste heat utilization, and their applications in sensors, the Internet of Things, health monitoring, etc. We believe that this review addresses the current research challenges and their future directions to the researchers for choosing potential materials to explore flexible TE technology.

Keywords

Flexible thermoelectrics / sensors / devices / health-monitoring / human-machine interactions

References

[1] Thakur AK,Singh SB.Graphene and its derivatives for secondary battery application. In: Sahoo S, Tiwari SK, Nayak GC, editors. Surface Engineering of Graphene. Cham: Springer International Publishing; 2019. pp. 53-80.

[2] Ahmad H,Minggu LJ,Masdar S.Enhancing methanol oxidation with a TiO₂ -modified semiconductor as a photo-catalyst.Int J Hydrogen Energy2017;42:8986-96

[3] Selvan KV,Mohamed Ali MS.State-of-the-art reviews and analyses of emerging research findings and achievements of thermoelectric materials over the past years.J Electron Mater2019;48:745-77

[4] Novak TG,Kim J.Complementary n-type and p-type graphene films for high power factor thermoelectric generators.Adv Funct Materials2020;30:2001760

[5] Stamenkovic VR,Lopes PP.Energy and fuels from electrochemical interfaces.Nat Mater2016;16:57-69

[6] Uher C.Materials aspect of thermoelectricity. 2016.

[7] Ravich II.Semiconducting lead chalcogenides. 2013. 5.

[8] Liu W,Yin K.Convergence of conduction bands as a means of enhancing thermoelectric performance of n-type Mg₂Si_1-xSn_x solid solutions.Phys Rev Lett2012;108:166601

[9] Qian X,Wang D.Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through alloying CdSe.Energy Environ Sci2019;12:1969-78

[10] Jang H,Park I.Long-range ordered graphitic structure in silk fibers delaminated using dopamine and thermal treatment for super-flexible electronic textiles: Possible applications for magnetic and thermoelectric textiles.Adv Compos Hybrid Mater2024;7:857

[11] Hsu KF,Guo F.Cubic AgPb(m)SbTe(2+m): bulk thermoelectric materials with high figure of merit.Science2004;303:818-21

[12] Li J,Lin S,Pei Y.Realizing the high thermoelectric performance of GeTe by Sb-doping and Se-alloying.Chem Mater2017;29:605-11

[13] Xiao Y.Charge and phonon transport in PbTe-based thermoelectric materials.npj Quant Mater2018;3:127

[14] Hodges JM,Grovogui JA.Chemical insights into PbSe- x%HgSe: high power factor and improved thermoelectric performance by alloying with discordant atoms.J Am Chem Soc2018;140:18115-23

[15] Tan G,Hao S.Codoping in SnTe: Enhancement of thermoelectric performance through synergy of resonance levels and band convergence.J Am Chem Soc2015;137:5100-12

[16] Li J,Li J.BiSbTe-based nanocomposites with High ZT : the effect of sic nanodispersion on thermoelectric properties.Adv Funct Materials2013;23:4317-23

[17] Fang T,Hu C.Complex band structures and lattice dynamics of Bi₂Te₃-based compounds and solid solutions.Adv Funct Materials2019;29:1900677

[18] Mizuguchi Y,Omachi A,Saini NL.Thermoelectric properties of new Bi-chalcogenide layered compounds.Cogent Physics2016;3

[19] Zhao LD,Hao SQ.All-scale hierarchical thermoelectrics: MgTe in PbTe facilitates valence band convergence and suppresses bipolar thermal transport for high performance.Energy Environ Sci2013;6:3346

[20] Rowe D.Introduction. In: Rowe D, editor. CRC Handbook of Thermoelectrics. CRC Press; 1995.

[21] Zhang X,Lin S,Li W.GeTe Thermoelectrics.Joule2020;4:986-1003

[22] Li J,Zhang X,Yang J.Electronic origin of the high thermoelectric performance of GeTe among the p-type group IV monotellurides.NPG Asia Mater2017;9:e353-e353

[23] Perumal S,Negi DS,Biswas K.High Thermoelectric performance and enhanced mechanical stability of p-type Ge_1–x Sb_xTe.Chem Mater2015;27:7171-8

[24] Li J,Zhang X.Simultaneous optimization of carrier concentration and alloy scattering for ultrahigh performance GeTe thermoelectrics.Adv Sci (Weinh)2017;4:1700341 PMCID:PMC5737105

[25] Chen Z,Li W.Vacancy-induced dislocations within grains for high-performance PbSe thermoelectrics.Nat Commun2017;8:13828 PMCID:PMC5216132

[26] Liu C,Peng Y.Charge transfer engineering to achieve extraordinary power generation in GeTe-based thermoelectric materials.Sci Adv2023;9:eadh0713 PMCID:PMC10132743

[27] Berman R.Thermal conduction in solids.Physics Today1978;31:56-7

[28] Donadio D.Atomistic simulations of heat transport in silicon nanowires.Phys Rev Lett2009;102:195901

[29] Biswas K,Blum ID.High-performance bulk thermoelectrics with all-scale hierarchical architectures.Nature2012;489:414-8

[30] Snyder GJ.Complex thermoelectric materials.Nat Mater2008;7:105-14

[31] Liang L,Shi XL.A flexible quasi-solid-state thermoelectrochemical cell with high stretchability as an energy-autonomous strain sensor.Mater Horiz2021;8:2750-60

[32] Zhang L,Yang Y.Flexible thermoelectric materials and devices: From materials to applications.Mater Today2021;46:62-108

[33] Huang L,Xu Z.Fiber-based energy conversion devices for human-body energy harvesting.Adv Mater2020;32:e1902034

[34] Yang Q,Qiu P.Flexible thermoelectrics based on ductile semiconductors.Science2022;377:854-8

[35] Shi X,Hao F.Room-temperature ductile inorganic semiconductor.Nat Mater2018;17:421-6

[36] Yang S,Qiu P.Ductile Ag₂₀S₇Te₃ with excellent shape-conformability and high thermoelectric performance.Adv Mater2021;33:e2007681

[37] Zhang H,Chen C,Wang LM.High-conductivity chalcogenide glasses in Ag-Ga₂Te₃-SnTe systems and their suitability as thermoelectric materials.ACS Appl Mater Interfaces2023;15:19170-7

[38] Gao Z,Qiu P.p-Type plastic inorganic thermoelectric materials.Adv Energy Mater2021;11:2100883

[39] Wang Y,Yang S,Chen L.Mechanical and thermoelectric properties in Te-rich Ag₂(Te,S) meta-phases.J Materiomics2024;10:543-51

[40] Yang Q,Qiu P.Incommensurately modulated structure in AgCuSe-based thermoelectric materials for intriguing electrical, thermal, and mechanical properties.Small2023;19:e2300699

[41] Liang J,Qiu P.Flexible thermoelectrics: from silver chalcogenides to full-inorganic devices.Energy Environ Sci2019;12:2983-90

[42] Kang M,Sun X.Self-powered temperature electronic skin based on island-bridge structure and Bi-Te micro-thermoelectric generator for distributed mini-region sensing.Adv Mater2023;35:e2309629

[43] Aguayo-Tapia S,Rangel-Magdaleno JJ.Entropy-based methods for motor fault detection: a review.Entropy (Basel)2024;26:299 PMCID:PMC11048766

[44] Yuan J,Wei C.A fully self-powered wearable leg movement sensing system for human health monitoring.Adv Sci (Weinh)2023;10:e2303114 PMCID:PMC10582417

[45] Hou Y,Wang Z.Whole fabric-assisted thermoelectric devices for wearable electronics.Adv Sci (Weinh)2022;9:e2103574 PMCID:PMC8728843

[46] Lee B,Park KT.High-performance compliant thermoelectric generators with magnetically self-assembled soft heat conductors for self-powered wearable electronics.Nat Commun2020;11:5948 PMCID:PMC7684283

[47] Liu Y,Wang X.Passive radiative cooling enables improved performance in wearable thermoelectric generators.Small2022;18:e2106875

[48] Twaha S,Yan Y.A comprehensive review of thermoelectric technology: Materials, applications, modelling and performance improvement.Renew Sustain Energy Rev2016;65:698-726

[49] Nozariasbmarz A,Dsouza K.Review of wearable thermoelectric energy harvesting: From body temperature to electronic systems.Appl Energy2020;258:114069

[50] Jiang Y,Zhuang HL.Evolution of defect structures leading to high ZT in GeTe-based thermoelectric materials.Nat Commun2022;13:6087 PMCID:PMC9568533

[51] Spann BT,Brubaker MD.Semiconductor thermal and electrical properties decoupled by localized phonon resonances.Adv Mater2023;35:e2209779

[52] Tarascon J.Issues and challenges facing rechargeable lithium batteries. Materials for Sustainable Energy. Co-Published with Macmillan Publishers Ltd, UK; 2010. pp. 171-9.

[53] Yin L,Trifonov A,Wang J.Designing wearable microgrids: towards autonomous sustainable on-body energy management.Energy Environ Sci2022;15:82-101

[54] Yan Q.High-performance thermoelectrics and challenges for practical devices.Nat Mater2022;21:503-13

[55] Kim F,Eom Y.3D printing of shape-conformable thermoelectric materials using all-inorganic Bi₂Te₃-based inks.Nat Energy2018;3:301-9

[56] Chowdhury I,Lofgreen K.On-chip cooling by superlattice-based thin-film thermoelectrics.Nat Nanotechnol2009;4:235-8

[57] Li G,Lara Ramos DA.Integrated microthermoelectric coolers with rapid response time and high device reliability.Nat Electron2018;1:555-61

[58] Snyder GJ,Huang CK.Thermoelectric microdevice fabricated by a MEMS-like electrochemical process.Nat Mater2003;2:528-31

[59] Morelli DT.Low temperature properties of the filled skutterudite CeFe4Sb12.Journal of Applied Physics1995;77:3777-81

[60] Yan X,Ma Y.Experimental studies on anisotropic thermoelectric properties and structures of n-type Bi₂Te_2.7Se_0.3.Nano Lett2010;10:3373-8

[61] Yang JC,Kwon SY,Bao Z.Electronic skin: recent progress and future prospects for skin-attachable devices for health monitoring, robotics, and prosthetics.Adv Mater2019;31:e1904765

[62] Chun S,Yoo Y.An artificial neural tactile sensing system.Nat Electron2021;4:429-38

[63] Pyo S,Bae K,Kim J.Recent progress in flexible tactile sensors for human-interactive systems: from sensors to advanced applications.Adv Mater2021;33:e2005902

[64] Wei Y,Wang Y.Graphene-based multifunctional textile for sensing and actuating.ACS Nano2021;15:17738-47

[65] Jung YH,Wang HS.Flexible piezoelectric acoustic sensors and machine learning for speech processing.Adv Mater2020;32:e1904020

[66] Fan F,Lin Wang Z.Flexible triboelectric generator.Nano Energy2012;1:328-34

[67] Zhou Q,Hu F.Magnetized microcilia array-based self-powered electronic skin for micro-scaled 3D morphology recognition and high-capacity communication.Adv Funct Materials2022;32:2208120

[68] Cao Z,Zheng Y.Highly flexible and sensitive temperature sensors based on Ti₃C₂T_x (MXene) for electronic skin.J Mater Chem A2019;7:25314-23

[69] Bermúdez GS, Makarov D. Magnetosensitive e-skins for interactive devices.Adv Funct Materials2021;31:2007788

[70] Lu L,Hu G,Yang B.Flexible noncontact sensing for human-machine interaction.Adv Mater2021;33:e2100218

[71] Sun T,Zheng Q,Jiang W.Stretchable fabric generates electric power from woven thermoelectric fibers.Nat Commun2020;11:572 PMCID:PMC6989526

[72] Wang Y,Zhao W.Antibacterial fabrics based on synergy of piezoelectric effect and physical interaction.Nano Today2023;48:101737

[73] Qiu W,Luo N,Wang D.Sandwich-like sound-driven triboelectric nanogenerator for energy harvesting and electrochromic based on Cu foam.Nano Energy2020;70:104543

[74] Chen Z,Wen N,Fan Z.Construction of flexible, self-supporting, and in-plane anisotropic PEDOT:PSS thermoelectric films via the wet-winding approach.ACS Appl Polym Mater2023;5:2905-16

[75] Li YY,Li D.Enhanced thermoelectric performance of Cu₂Se/Bi_0.4Sb_1.6Te₃ nanocomposites at elevated temperatures.Appl Phys Lett2016;108:062104

[76] Cao T,Chen Z.Advances in the design and assembly of flexible thermoelectric device.Prog Mater Sci2023;131:101003

[77] Lee T,Ku BC.Carbon nanotube fibers with enhanced longitudinal carrier mobility for high-performance all-carbon thermoelectric generators.Nanoscale2019;11:16919-27

[78] Zhang T,Zhang J.High-performance, flexible, and ultralong crystalline thermoelectric fibers.Nano Energy2017;41:35-42

[79] Shalini V,Archana J,Navaneethan M.Interface effect and band engineering in Bi₂Te₃:C and Bi₂Te₃:Ni-Cu with enhanced thermopower for self-powered wearable thermoelectric generator.J Alloys Compd2021;868:158905

[80] Yang ZY,Huang CH,Wang Y.Constructing A/B-Side heterogeneous asynchronous structure with Ag₂Se layers and bushy-like PPy toward high-performance flexible photo-thermoelectric generators.ACS Appl Mater Interfaces2022:33370-82

[81] Lu Y,Cai K.Ultrahigh performance PEDOT/Ag₂Se/CuAgSe composite film for wearable thermoelectric power generators.Mater Today Phys2020;14:100223

[82] Hou S,Yin L.High performance wearable thermoelectric generators using Ag2Se films with large carrier mobility.Nano Energy2021;87:106223

[83] He X,Hao Y.Highly stretchable, durable, and breathable thermoelectric fabrics for human body energy harvesting and sensing.Carbon Energy2022;4:621-32

[84] Lucas P,Yang Z.Thermoelectric bulk glasses based on the Cu–As–Te–Se system.J Mater Chem A2013;1:8917

[85] Jia Y,Sun H.Wearable thermoelectric materials and devices for self-powered electronic systems.Adv Mater2021;33:e2102990

[86] Yuan X,Shao Y.Bi₂Te₃-based wearable thermoelectric generator with high power density: from structure design to application.J Mater Chem C2022;10:6456-63

[87] Yao H,Cheng H.Recent development of thermoelectric polymers and composites.Macromol Rapid Commun2018;39:e1700727

[88] Wang H.Organic Thermoelectrics: materials preparation, performance optimization, and device integration.Joule2019;3:53-80

[89] Li M,Dargusch M,Chen Z.High-efficiency thermocells driven by thermo-electrochemical processes.Trends Chem2021;3:561-74

[90] Song W,Li T.The strategy of achieving flexibility in materials and configuration of flexible lithium-ion batteries.Energy Tech2021;9:2100539

[91] Hong X,Wen L.Nonlithium metal-sulfur batteries: steps toward a leap.Adv Mater2019;31:e1802822

[92] Cui Y,Liu W,Zhou M.Highly stretchable, sensitive, and multifunctional thermoelectric fabric for synergistic-sensing systems of human signal monitoring.Adv Fiber Mater2024;6:170-80

[93] Luo Y,Luo G.Highly sensitive piezoresistive and thermally responsive fibrous networks from the in situ growth of PEDOT on MWCNT-decorated electrospun PU fibers for pressure and temperature sensing.Microsyst Nanoeng2023;9:113 PMCID:PMC10504313

[94] Li TT,Zhang X,Lou CW.Photothermoelectric synergistic hydrovoltaic effect: a flexible photothermoelectric yarn panel for multiple renewable-energy harvesting.ACS Appl Mater Interfaces2023;

[95] Ma H,Wu H.Flexible Ag₂Se thermoelectric films enable the multifunctional thermal perception in electronic skins.ACS Appl Mater Interfaces2024;16:7453-62

[96] Hyland M,Liu J,Vashaee D.Wearable thermoelectric generators for human body heat harvesting.Appl Energy2016;182:518-24

[97] Chen G,Bick M.Smart textiles for electricity generation.Chem Rev2020;120:3668-720

[98] Elmoughni HM,Ozlem K.Thermoelectric clothing for body heat harvesting and personal cooling: design and fabrication of a textile-integrated flexible and vertical device.Energy Tech2022;10:2200528

[99] Zheng Y,Yang J.Durable, stretchable and washable inorganic-based woven thermoelectric textiles for power generation and solid-state cooling.Energy Environ Sci2022;15:2374-85

[100] Kwon C,Won C.Multi-functional and stretchable thermoelectric Bi₂Te₃ fabric for strain, pressure, and temperature-sensing.Adv Funct Materials2023;33:2300092

[101] Hajji M,Labrim H,Benaissa M.Strain effects on the electronic and thermoelectric properties of Bi2Te3: A first principles study.Comput Condens Matter2018;16:e00299

[102] Li N,Shen C.Large-scale flexible and transparent electronics based on monolayer molybdenum disulfide field-effect transistors.Nat Electron2020;3:711-7

[103] Liu S,Kong J,He C.Flexible, durable, green thermoelectric composite fabrics for textile-based wearable energy harvesting and self-powered sensing.Compos Sci Technol2023;243:110245

[104] Suarez F,Vashaee D.Designing thermoelectric generators for self-powered wearable electronics.Energy Environ Sci2016;9:2099-113

[105] Shen D,Zou G,Duley WW.Self-powered wearable electronics based on moisture enabled electricity generation.Adv Mater2018;30:e1705925

[106] Liu L,Wu L.Phase-selective synthesis of 1T' MoS₂ monolayers and heterophase bilayers.Nat Mater2018;17:1108-14

[107] Xue Y,Luo P.Asymmetric sandwich janus structure for high-performance textile-based thermo–hydroelectric generators toward human health monitoring.Adv Funct Materials2024;34:2310485

[108] Wen N,Zuo X.Investigations of morphology and carrier transport characteristics in high-performance PEDOT:PSS/tellurium binary composite fibers produced via continuous wet-spinning.Adv Funct Materials2024;34:2315677

[109] Wang X,Lv H,Chen G.Elastic aerogel thermoelectric generator with vertical temperature-difference architecture and compression-induced power enhancement.Nano Energy2021;90:106577

[110] Zhang L,Hua T,Liu S.Fiber-based thermoelectric generators: materials, device structures, fabrication, characterization, and applications.Adv Energy Mater2018;8:1700524

[111] Kim DH,Ma R.Epidermal electronics.Science2011;333:838-43

[112] Jeong JW,Shin G.Wireless optofluidic systems for programmable in vivo pharmacology and optogenetics.Cell2015;162:662-74 PMCID:PMC4525768

[113] Kim ES,Lee KH,Lee YH.Graphene substrate for van der waals epitaxy of layer-structured bismuth antimony telluride thermoelectric film.Adv Mater2017;29

[114] Jin Q,Long X.Flexible carbon nanotube-epitaxially grown nanocrystals for micro-thermoelectric modules.Adv Mater2023;35:e2304751

[115] Xu N,Sheng Y.Synergistic tandem solar electricity-water generators.Joule2020;4:347-58

[116] Zhu P,Wang Y.Recyclable, healable, and stretchable high-power thermoelectric generator.Adv Energy Mater2021;11:2100920

[117] Kraemer D,Feng HP.High-performance flat-panel solar thermoelectric generators with high thermal concentration.Nat Mater2011;10:532-8

[118] Fukui T,Fujinuma S.Control over differentiation of a metastable supramolecular assembly in one and two dimensions.Nat Chem2017;9:493-9

[119] Zhuo M,Wang X.2D organic photonics: an asymmetric optical waveguide in self-assembled halogen-bonded cocrystals.Angew Chem2018;130:11470-4

[120] Zhen X,Jiang X.Photoacoustic imaging and photothermal therapy of semiconducting polymer nanoparticles: signal amplification and second near-infrared construction.Small2021;17:e2004723

[121] Xu J,Li S.Charge-transfer cocrystal via a persistent radical cation acceptor for efficient solar-thermal conversion.Angew Chem2022;134:e202202571

[122] Kim B,Park T,Kim E.NIR-sensitive poly(3,4-ethylenedioxyselenophene) derivatives for transparent photo-thermo-electric converters.Adv Mater2013;25:5483-9

[123] Zhang T,Srinivasan B.Ultraflexible glassy semiconductor fibers for thermal sensing and positioning.ACS Appl Mater Interfaces2019;11:2441-7

[124] Lü B,Li P,Müllen K.Stable radical anions generated from a porous perylenediimide metal-organic framework for boosting near-infrared photothermal conversion.Nat Commun2019;10:767 PMCID:PMC6377642

[125] Zhao YD,Chen Y.Organic charge-transfer cocrystals toward large-area nanofiber membrane for photothermal conversion and imaging.ACS Nano2022;16:15000-7

[126] Zhao YD,Zhuo S.Stretchable photothermal membrane of NIR-II charge-transfer cocrystal for wearable solar thermoelectric power generation.Sci Adv2023;9:eadh8917 PMCID:PMC10848765

[127] Yan W,Xiang Y.Thermally drawn advanced functional fibers: New frontier of flexible electronics.Mater Today2020;35:168-94

[128] Loke G,Khudiyev T,Fink Y.Recent progress and perspectives of thermally drawn multimaterial fiber electronics.Adv Mater2020;32:e1904911

[129] Zhang J,Zhang H.Single-crystal SnSe thermoelectric fibers via laser-induced directional crystallization: from 1D fibers to multidimensional fabrics.Adv Mater2020;32:e2002702

[130] Sun M,Huang B.Tailoring microstructure and electrical transportation through tensile stress in Bi₂Te₃ thermoelectric fibers.J Materiomics2020;6:467-75

[131] Sun M,Wang H.Enhanced Thermoelectric Properties of Bi₂Te₃ -Based Micro-Nano Fibers via Thermal Drawing and Interfacial Engineering.Adv Mater2022;34:e2202942

[132] Zhang X,Li T.Synergistic work of photo-thermoelectric and hydroelectric effects of hierarchical structure photo-thermoelectric textile for solar energy harvesting and solar steam generation simultaneously.Chem Eng J2021;426:131923

[133] Novoselov KS,Morozov SV.Electric field effect in atomically thin carbon films.Science2004;306:666-9

[134] Zhang Y,Stormer HL.Experimental observation of the quantum Hall effect and Berry's phase in graphene.Nature2005;438:201-4

[135] Gupta S,Lorenzelli L.Ultra-thin chips for high-performance flexible electronics.npj Flex Electron2018;2:21

[136] Niu Q,Lu L.Single molecular layer of silk nanoribbon as potential basic building block of silk materials.ACS Nano2018;12:11860-70

[137] Jeon JW,Jeong YJ.Pyroprotein-based electronic textiles with high stability.Adv Mater2017;29

[138] Wang C,Gao E.Carbonized silk fabric for ultrastretchable, highly sensitive, and wearable strain sensors.Adv Mater2016;28:6640-8

[139] Lee H,Miller WM.Mussel-inspired surface chemistry for multifunctional coatings.Science2007;318:426-30 PMCID:PMC2601629

[140] He G,Zhao J.Bioinspired ultrastrong solid electrolytes with fast proton conduction along 2D channels.Adv Mater2017;29

[141] Liu T,Chen M.Vertically aligned polyamidoxime/graphene oxide hybrid sheets’ membrane for ultrafast and selective extraction of uranium from seawater.Adv Funct Materials2022;32:2111049

[142] Bubnova O,Malti A.Optimization of the thermoelectric figure of merit in the conducting polymer poly(3,4-ethylenedioxythiophene).Nat Mater2011;10:429-33

[143] Du C,Li G.Toward precision recognition of complex hand motions: wearable thermoelectrics by synergistic 2D nanostructure confinement and controlled reduction.Adv Funct Materials2022;32:2206083

[144] Chung T,Heeger AJ.Charge storage in doped poly(thiophene): Optical and electrochemical studies.Phys Rev B1984;30:702-10

[145] Li Z,Wu L,Dou H.Enabling giant thermopower by heterostructure engineering of hydrated vanadium pentoxide for zinc ion thermal charging cells.Nat Commun2023;14:6816 PMCID:PMC10603064

[146] Kwon DA,Kim CY,Park S.Body-temperature softening electronic ink for additive manufacturing of transformative bioelectronics via direct writing.Sci Adv2024;10:eadn1186 PMCID:PMC10901467

[147] Byun S,Agno K.Materials and manufacturing strategies for mechanically transformative electronics.Mater Today Adv2020;7:100089

[148] Byun SH,Agno KC.Design strategy for transformative electronic system toward rapid, bidirectional stiffness tuning using graphene and flexible thermoelectric device interfaces.Adv Mater2021;33:e2007239

[149] Byun SH,Heo SY.Self-cooling gallium-based transformative electronics with a radiative cooler for reliable stiffness tuning in outdoor use.Adv Sci (Weinh)2022;9:e2202549 PMCID:PMC9404411

[150] Lin Y,Dickey MD.Attributes, fabrication, and applications of gallium-based liquid metal particles.Adv Sci (Weinh)2020;7:2000192 PMCID:PMC7312306

[151] Lei Z,Wu P.Double-network thermocells with extraordinary toughness and boosted power density for continuous heat harvesting.Joule2021;5:2211-22

[152] Ding T,Wang X.All-soft and stretchable thermogalvanic gel fabric for antideformity body heat harvesting wearable.Adv Energy Mater2021;11:2102219

[153] Xu C,Zhang J,Tian H.Adaptable and wearable thermocell based on stretchable hydrogel for body heat harvesting.Adv Energy Mater2022;12:2201542

[154] Sun M,Tang G.Enhanced thermoelectric properties of polycrystalline Bi2Te3 core fibers with preferentially oriented nanosheets.APL Mater2018;6:036103

[155] Fu Y,Gu H.Superflexible inorganic Ag₂Te_0.6S_0.4 fiber with high thermoelectric performance.Adv Sci (Weinh)2023;10:e2207642 PMCID:PMC10161083

[156] Sun Y,Di C.Organic thermoelectric materials and devices based on p- and n-type poly(metal 1,1,2,2-ethenetetrathiolate)s.Adv Mater2012;24:932-7

[157] Li J,Zhang M.Polymer-based thermoelectric materials: A review of power factor improving strategies.J Materiomics2022;8:204-20

[158] Lee C,Hashimoto H.Effect of nonstoichiometry on the thermoelectric properties of a Ag2Se alloy prepared by a mechanical alloying process.J Appl Phys2007;101:024920

[159] Kim SI,Mun HA.Thermoelectrics. Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics.Science2015;348:109-14

[160] Deng T,Qiu P.High thermoelectric power factors in plastic/ductile bulk SnSe₂-based crystals.Adv Mater2024;36:e2304219

[161] Liu J,Gao Z.Enhanced thermoelectric performance in ductile Ag₂S-based materials via doping iodine.Appl Phys Lett2021;119:121905

[162] Liang X.Ductile inorganic amorphous/crystalline composite Ag₄TeS with phonon-glass electron-crystal transport behavior and excellent stability of high thermoelectric performance on plastic deformation.Acta Materialia2021;218:117231

[163] He S,Liu L.Semiconductor glass with superior flexibility and high room temperature thermoelectric performance.Sci Adv2020;6:eaaz8423 PMCID:PMC7148084

[164] Kim GH,Zhang K.Engineered doping of organic semiconductors for enhanced thermoelectric efficiency.Nat Mater2013;12:719-23

[165] Lu Y,Qiu Y.Good Performance and Flexible PEDOT:PSS/Cu₂Se Nanowire Thermoelectric Composite Films.ACS Appl Mater Interfaces2019;11:12819-29

[166] Qu S,Wang L.Highly anisotropic P3HT films with enhanced thermoelectric performance via organic small molecule epitaxy.NPG Asia Mater2016;8:e292-e292

[167] Liu Y,Zhang B.Ferroelectric polymers exhibiting behaviour reminiscent of a morphotropic phase boundary.Nature2018;562:96-100

[168] Li F,Chen Z.Ultrahigh piezoelectricity in ferroelectric ceramics by design.Nat Mater2018;17:349-54

[169] Liang J,Zhu Y.Crystalline structure-dependent mechanical and thermoelectric performance in Ag₂Se_1-xS_x system.Research (Wash D C)2020;2020:6591981 PMCID:PMC7521025

[170] Liang J,Qiu P.Modulation of the morphotropic phase boundary for high-performance ductile thermoelectric materials.Nat Commun2023;14:8442 PMCID:PMC10730612

[171] Waqar M,Chen J,Wang J.Evolution from lead-based to lead-free piezoelectrics: engineering of lattices, domains, boundaries, and defects leading to giant response.Adv Mater2022;34:e2106845

[172] Li C,Liu C.A simple thermoelectric device based on inorganic/organic composite thin film for energy harvesting.Chem Eng J2017;320:201-10

[173] Li Z,Hsiao C.A free-standing high-output power density thermoelectric device based on structure-ordered PEDOT:PSS.Adv Elect Materials2018;4:1700496

[174] Varghese T,Richardson J.High-performance and flexible thermoelectric films by screen printing solution-processed nanoplate crystals.Sci Rep2016;6:33135 PMCID:PMC5018881

[175] Wang L,Geng L.Solution-printable fullerene/TiS₂ organic/inorganic hybrids for high-performance flexible n-type thermoelectrics.Energy Environ Sci2018;11:1307-17

[176] Gao Z,Deng T.High-throughput screening of 2D van der Waals crystals with plastic deformability.Nat Commun2022;13:7491 PMCID:PMC9723169

[177] Wei S,Lv H,Chen G.SWCNT network evolution of PEDOT:PSS/SWCNT composites for thermoelectric application.Chem Eng J2022;428:131137

[178] Thomas TH,Gillett AJ.Short contacts between chains enhancing luminescence quantum yields and carrier mobilities in conjugated copolymers.Nat Commun2019;10:2614 PMCID:PMC6565747

[179] Venkateshvaran D,Sadhanala A.Approaching disorder-free transport in high-mobility conjugated polymers.Nature2014;515:384-8

[180] Yang K,Harbuzaru A.Stable organic diradicals based on fused quinoidal oligothiophene imides with high electrical conductivity.J Am Chem Soc2020;142:4329-40

[181] Zhou Y,Yao Z.Systematic investigation of solution-state aggregation effect on electrical conductivity in doped conjugated polymers.CCS Chem2021;3:2994-3004

[182] Naab BD,Olthof S.Mechanistic study on the solution-phase n-doping of 1,3-dimethyl-2-aryl-2,3-dihydro-1H-benzoimidazole derivatives.J Am Chem Soc2013;135:15018-25 PMCID:PMC3994987

[183] Lu Y,Un HI.Persistent conjugated backbone and disordered lamellar packing impart polymers with efficient n-doping and high conductivities.Adv Mater2021;33:e2005946

[184] Lu Y,Pei J.Achieving efficient n-doping of conjugated polymers by molecular dopants.Acc Chem Res2021;54:2871-83

[185] Yu ZD,Wang ZY.High n-type and p-type conductivities and power factors achieved in a single conjugated polymer.Sci Adv2023;9:eadf3495 PMCID:PMC9956111

[186] Yang CY,Huang D.A thermally activated and highly miscible dopant for n-type organic thermoelectrics.Nat Commun2020;11:3292 PMCID:PMC7335177

[187] Liu H,Chi C.Direct printing of flexible multilayer composite electrodes based on electrohydrodynamic printing.ACS Appl Electron Mater2024;6:724-36

[188] Ding X,Zhang M.Surface plasmon resonance enhanced light absorption and photothermal therapy in the second near-infrared window.J Am Chem Soc2014;136:15684-93

[189] Wang J,Deng L.High-performance photothermal conversion of narrow-bandgap Ti₂O₃ nanoparticles.Adv Mater2017;29

[190] Jiang Y,Zhen X,Pu K.Dual-peak absorbing semiconducting copolymer nanoparticles for first and second near-infrared window photothermal therapy: a comparative study.Adv Mater2018;30:e1705980

[191] Chen C,Song J.Highly flexible and efficient solar steam generation device.Adv Mater2017;29

[192] Jun YS,Ghim D,Cao S.photothermal membrane water treatment for two worlds.Acc Chem Res2019;52:1215-25

[193] Yang M,Lu W,Ho GW.Spectrum tailored defective 2D semiconductor nanosheets aerogel for full-spectrum-driven photothermal water evaporation and photochemical degradation.Adv Funct Materials2020;30:2004460

[194] Zhang Q,Ai X.Transparent power-generating windows based on solar-thermal-electric conversion.Adv Energy Mater2021;11:2101213

[195] Lu Y,Fu J.Novel smart textile with phase change materials encapsulated core-sheath structure fabricated by coaxial electrospinning.Chem Eng J2019;355:532-9

[196] Chang J,Zhang M.Tailor-made white photothermal fabrics: a bridge between pragmatism and aesthetic.Adv Mater2023;35:e2209215

[197] Zhuo S,Dong Zhao Y.Large-area nanofiber membrane of NIR photothermal Cs_0.32WO₃ for flexible and all-weather solar thermoelectric generation.Chem Eng J2024;479:147571

[198] Sun Z,Wei C.Transparent, photothermal and stretchable alginate-based hydrogels for remote actuation and human motion sensing.Carbohydr Polym2022;293:119727

[199] Xiang D,Chen X.High-performance fiber strain sensor of carbon nanotube/thermoplastic polyurethane@styrene butadiene styrene with a double percolated structure.Front Mater Sci2022;16:586

[200] Xiang D,Harkin-jones E.Synergistic effects of hybrid conductive nanofillers on the performance of 3D printed highly elastic strain sensors.Compos Part A Appl Sci Manuf2020;129:105730

[201] Wan B,Zhang Z.Water-dispersible and stable polydopamine coated cellulose nanocrystal-MXene composites for high transparent, adhesive and conductive hydrogels.Carbohydr Polym2023;314:120929

[202] Sun X,Ye L.An extremely tough and ionic conductive natural-polymer-based double network hydrogel.J Mater Chem B2021;9:7751-9

[203] Gao T,Yang Y.Mechanical reliable, NIR light-induced rapid self-healing hydrogel electrolyte towards flexible zinc-ion hybrid supercapacitors with low-temperature adaptability and long service life.J Energy Chem2024;92:63-73

[204] Xue C,Zhang L.Self-healing/pH-responsive/inherently antibacterial polysaccharide-based hydrogel for a photothermal strengthened wound dressing.Colloids Surf B Biointerfaces2022;218:112738

[205] Hou M,Liu W.Mxene hybrid conductive hydrogels with mechanical flexibility, frost-resistance, photothermoelectric conversion characteristics and their multiple applications in sensing.Chem Eng J2024;483:149299

[206] Yang H,Xiao X.Topographic design in wearable MXene sensors with in-sensor machine learning for full-body avatar reconstruction.Nat Commun2022;13:5311 PMCID:PMC9461448

[207] Armstrong LE,Belval LN.Metabolism, bioenergetics and thermal physiology: influences of the human intestinal microbiota.Nutr Res Rev2019;32:205-17

[208] Borghini S,Chiesa S.Clinical presentation and pathogenesis of cold-induced autoinflammatory disease in a family with recurrence of an NLRP₁₂ mutation.Arthritis Rheum2011;63:830-9 PMCID:PMC3112487

[209] Zeng P,Klareskog L.Working in cold environment and risk of developing rheumatoid arthritis: results from the Swedish EIRA case-control study.RMD Open2017;3:e000488 PMCID:PMC5574417

[210] Park C,Kim HH.Stretchable conductive nanocomposites and their applications in wearable devices.Appl Phys Rev2022;9:021312

[211] Pang G,Pang Z.Review of robot skin: a potential enabler for safe collaboration, immersive teleoperation, and affective interaction of future collaborative robots.IEEE Trans Med Robot Bionics2021;3:681-700

[212] Yi N,Verso AL Jr.Fabricating functional circuits on 3D freeform surfaces via intense pulsed light-induced zinc mass transfer.Mater Today (Kidlington)2021;50:24-34 PMCID:PMC8846415

[213] Chen A,Zhu G.Polymer materials for high-performance triboelectric nanogenerators.Adv Sci (Weinh)2020;7:2000186 PMCID:PMC7375247

[214] Luo Y,Luo G.All electrospun fabrics based piezoelectric tactile sensor.Nanotechnology2022;33:415502

[215] Yi Y,Liu X.Flexible piezoresistive strain sensor based on CNTs–polymer composites: a brief review.Carbon Lett2022;32:713-26

[216] Park S,Lee W.Self-powered ultra-flexible electronics via nano-grating-patterned organic photovoltaics.Nature2018;561:516-21

[217] Yang Y.Wearable and flexible electronics for continuous molecular monitoring.Chem Soc Rev2019;48:1465-91

[218] Cao X,Sun J,Sun Q.Piezoelectric nanogenerators derived self-powered sensors for multifunctional applications and artificial intelligence.Adv Funct Materials2021;31:2102983

[219] Zhang J,Wang Z,Li X.Low-grade thermal energy harvesting and self-powered sensing based on thermogalvanic hydrogels.Micromachines (Basel)2023;14:155 PMCID:PMC9863090

[220] Liu Y,Ling W.Thermo-electrochemical cells for heat to electricity conversion: from mechanisms, materials, strategies to applications.Energy Environ Sci2022;15:3670-87

[221] Shi X,Li Y.Double hydrogen-bonding reinforced high-performance supramolecular hydrogel thermocell for self-powered sensing remote-controlled by light.Adv Funct Materials2023;33:2211720

[222] Li X,Wang T.Self-powered respiratory monitoring strategy based on adaptive dual-network thermogalvanic hydrogels.ACS Appl Mater Interfaces2022;14:48743-51

[223] Cacicedo ML,Servetas I.Progress in bacterial cellulose matrices for biotechnological applications.Bioresour Technol2016;213:172-80

[224] Li J,Han Z.High performance bacterial cellulose organogel-based thermoelectrochemical cells by organic solvent-driven crystallization for body heat harvest and self-powered wearable strain sensors.Adv Funct Materials2023;33:2306509

[225] Zhou Z,Li X.Sign-to-speech translation using machine-learning-assisted stretchable sensor arrays.Nat Electron2020;3:571-8

[226] Li G,Chen J.Thermoelectric and photoelectric dual modulated sensors for human internet of things application in accurate fire recognition and warning.Adv Funct Materials2023;33:2303861

[227] Li L,Zhang D.Near-infrared light triggered self-powered mechano-optical communication system using wearable photodetector textile.Adv Funct Materials2021;31:2104782

[228] Ding J,Jin W,Zhu D.Advanced thermoelectric materials for flexible cooling application.Adv Funct Materials2021;31:2010695

[229] Hsu AL,Gabor NM.Graphene-based thermopile for thermal imaging applications.Nano Lett2015;15:7211-6

[230] Gao F,Ma Q.Multifunctional thermoelectric temperature sensor for noncontact information transfer and tactile sensing in human-machine interaction.Adv Funct Materials2024;34:2309553

[231] Zakery A.Optical properties and applications of chalcogenide glasses: a review.J Non-Cryst Solids2003;330:1-12

[232] Fu Y,Xiang G.Ultraflexible temperature-strain dual-sensor based on chalcogenide glass-polymer film for human-machine interaction.Adv Mater2024;36:e2313101

[233] Wang W,Zhong D.Neuromorphic sensorimotor loop embodied by monolithically integrated, low-voltage, soft e-skin.Science2023;380:735-42

[234] Jung D,Shim HJ.Highly conductive and elastic nanomembrane for skin electronics.Science2021;373:1022-6

[235] Chen C,Wang Q.Biomimetic multimodal receptors for comprehensive artificial human somatosensory system.Adv Mater2024;36:e2313228

[236] Chen C,Wu Y.Manipulating hetero-nanowire films for flexible and multifunctional thermoelectric devices.Adv Mater2024;36:e2400020