Island-bridge microstructured triboelectric pressure sensor for effective dynamic epidermal pulse monitoring

Abstract

Continuous and precise monitoring of pulse waveforms is essential for the prevention and early diagnosis of cardiovascular diseases. However, current pulse sensors suffer from significant motion artifacts caused by inadequate skin-device adhesion and poor interfacial conformability during physical activity. In this work, we develop a highly sensitive and conformal pressure sensor featuring an innovative island-bridge configuration capable of accurately measuring arterial pulse waveforms across multiple body artery sites, even under motion artifacts. Through finite element analysis and systematic experimental validation, the unique island-bridge design is demonstrated in achieving both superior signal fidelity and motion artifact suppression. The developed sensor shows a high-pressure sensitivity of 4.75 V/kPa, a rapid response time of less than 30 ms, and excellent durability over 6,000 cyclic loads. Furthermore, it has demonstrated exceptional performance in capturing pulse waveforms across multiple body sites, allowing the extraction of crucial cardiovascular parameters, even in the presence of motion artifacts. Given the remarkable advantages, our study presents a unique triboelectric sensor design that not only improves the sensitivity but also effectively eliminates motion artifacts, providing a promising solution for creating wearable pressure sensors for continuous cardiovascular monitoring.

Keywords

Triboelectric nanogenerator / triboelectric sensor / self-powered sensor / pulse monitoring

References

[1] Baghdadi NA,Malki A,Ewis A.Advanced machine learning techniques for cardiovascular disease early detection and diagnosis.J Big Data2023;10:144

[2] Tsao CW, Aday AW, Almarzooq ZI, et al; American Heart Association Council on Epidemiology and Prevention Statistics Committee and Stroke Statistics Subcommittee. Heart disease and stroke statistics-2023 update: a report from the American Heart Association. Circulation. 2023, 147, e93-621. PMCID:PMC12135016

[3] Ghunaim AH,Elfaki LA,Marquis-Gravel G.Disparities in therapies for coronary artery disease with reduced left ventricular ejection fraction.Vessel Plus2023;7:29

[4] Maltos-Gómez F,Uriarte-Ortiz JB,Muñoz-Comonfort A.Association between diet, physical activity, smoking, and ultra-processed food and cardiovascular health, depression, and sleep quality.Cureus2024;16:e66561 PMCID:PMC11382331

[5] Muthukumar KA,Ranjan P.Integrating electrocardiogram and fundus images for early detection of cardiovascular diseases.Sci Rep2025;15:4390 PMCID:PMC11799439

[6] Fan W,Meng K.Machine-knitted washable sensor array textile for precise epidermal physiological signal monitoring.Sci Adv2020;6:eaay2840 PMCID:PMC7069695

[7] Si S,Wu Y.3D interlocked all-textile structured triboelectric pressure sensor for accurately measuring epidermal pulse waves in amphibious environments.Nano Res2024;17:1923-32

[8] Cao M,Fan S,Su D.Wearable piezoresistive pressure sensors based on 3D graphene.Chem Eng J2021;406:126777

[9] Pang Y,Tao L.Flexible, highly sensitive, and wearable pressure and strain sensors with graphene porous network structure.ACS Appl Mater Interfaces2016;8:26458-62

[10] Jafarizadeh B,Khakpour I,Wang C.Design rules for a wearable micro-fabricated piezo-resistive pressure sensor.Micromachines2022;13:838 PMCID:PMC9229048

[11] Kumar S, Soni A, Kumar A. Evaluation of blood pressure using a flexible and wearable capacitive pressure sensor.RSC Adv2023;13:35397-407 PMCID:PMC10696412

[12] Javidi R,Alizadeh Majd S.Designing wearable capacitive pressure sensors with arrangement of porous pyramidal microstructures.Micro Nano Syst Lett2023;11:13

[13] Kumar A. Flexible and wearable capacitive pressure sensor for blood pressure monitoring.Sens Bio Sens Res2021;33:100434

[14] Sagar P,Shukla M,Kumar B.Flexible piezoelectric nanogenerator based on Nd-ZnS nanoplates for human body movements detection and wearable electronics.J Alloys Compd2025;1010:178035

[15] Yu Y,Ge H.A self-powered piezoelectric Poly(vinyl alcohol)/Polyvinylidene fluoride fiber membrane with alternating multilayer porous structure for energy harvesting and wearable sensors.Compos Sci Technol2024;247:110429

[16] Lin Z,Lu Y.Device design and data processing strategies for self-powered cardiovascular sensors.Device2025;3:100726

[17] Chen J.Reviving vibration energy harvesting and self-powered sensing by a triboelectric nanogenerator.Joule2017;1:480-521

[18] Fang Y,Xu J.Ambulatory cardiovascular monitoring via a machine-learning-assisted textile triboelectric sensor.Adv Mater2021;33:e2104178 PMCID:PMC9205313

[19] Jafarizadeh B,Islam Sozal MS,Pala N.Wearable system integrating dual piezoresistive and photoplethysmography sensors for simultaneous pulse wave monitoring.ACS Appl Mater Interfaces2024;16:65402-13

[20] Yan J,Shi F.Reflection-type photoplethysmography pulse sensor based on an integrated optoelectronic chip with a ring structure.Biomed Opt Express2021;12:6277-83 PMCID:PMC8548011

[21] Ding L,Sun C.Three-dimensional structured dual-mode flexible sensors for highly sensitive tactile perception and noncontact sensing.ACS Appl Mater Interfaces2020;12:20955-64

[22] Jahnavi M,Singh M,Maruthy KN.Assessment of pulse wave velocity in obese adults using ECG and finger tip photo pulse plethysmography.Int Physiol J2020;7:66-9

[23] Pang C,Nguyen A.Highly skin-conformal microhairy sensor for pulse signal amplification.Adv Mater2015;27:634-40

[24] Biswas D,Liu M.CorNET: deep learning framework for PPG-based heart rate estimation and biometric identification in ambulant environment.IEEE Trans Biomed Circuits Syst2019;13:282-91

[25] Han M,Aras K.Catheter-integrated soft multilayer electronic arrays for multiplexed sensing and actuation during cardiac surgery.Nat Biomed Eng2020;4:997-1009 PMCID:PMC8021456

[26] Song D,Zhang Y.Relationship between estimated pulse wave velocity and the risk of future sarcopenia in middle-aged and older Chinese adults: evidence from the China Health and Retirement Longitudinal Study.Front Cardiovasc Med2025;12:1494635 PMCID:PMC11872886

[27] Omboni S,Benczur B.Ambulatory monitoring of central arterial pressure, wave reflections, and arterial stiffness in patients at cardiovascular risk.J Hum Hypertens2022;36:352-63

[28] Wang X,Meng K.Enabling the unconstrained epidermal pulse wave monitoring via finger-touching.Adv Funct Mater2021;31:2102378

[29] Kumar R,Nigam VK.Correlation of Poincare plot derived stress score and heart rate variability parameters in the assessment of coronary artery disease.Biomed Eng Appl Basis Commun2024;36:2350040

[30] Meng K,Zhou Y.A wireless textile-based sensor system for self-powered personalized health care.Matter2020;2:896-907