WO₃ nanomaterials synthesized via a sol-gel method and calcination for use as a CO gas sensor

Abstract

Carbon monoxide is a poisonous and hazardous gas and sensitive sensor devices are needed to prevent humans from being poisoned by this gas. A CO gas sensor has been prepared from WO₃ synthesized by a sol-gel method. The sensor chip was prepared by a spin-coating technique which deposited a thin film of WO₃ on an alumina substrate. The chip samples were then calcined at 300, 400, 500 or 600 °C for 1 h. The sensitivities of the different sensor chips for CO gas were determined by comparing the changes in electrical resistance in the absence and presence of 50 ppm of CO gas at 200 °C. The WO₃ calcined at 500 °C had the highest sensitivity. The sensitivity of this sensor was also measured at CO concentrations of 100 ppm and 200 ppm and at operating temperatures of 30 and 100 °C. Thermogravimetric analysis of the WO₃ calcined at 500 °C indicated that this sample had the highest gas adsorption capacity. This preliminary research has shown that WO₃ can serve as a CO gas sensor and that is should be further explored and developed.

Keywords

WO₃ nanomaterial / sol-gel / calcinations / CO gas sensor / sensitivity

References

[1] WangS H, ChouT C, LiuC C. Nano-crystalline tungsten oxide NO₂ sensor. Sensors and Actuators. B, Chemical, 2003, 94(3): 343-351

[2] LiuZ, MiyauchiM, YamazakiT, ZhenY. Facile synthesis and NO₂ gas sensing of tungsten oxide nanorods assembled microspheres. Sensors and Actuators. B, Chemical, 2009, 140(2): 514-519

[3] BoulovaM, GaskovA, LucazeauG. Tungsten oxide reactivity versus CH₄, CO and NO₂ molecules studied by Raman spectroscopy. Sensors and Actuators. B, Chemical, 2001, 81(1): 99-106

[4] YanA, XieC, ZengD, CaiS, HuM. Synthesis, formation mechanism and sensing properties of WO₃ hydrate nanowire netted-spheres. Materials Research Bulletin, 2010, 45(10): 1541-1547

[5] KananS M, TrippC P. Synthesis, FTIR studies and sensor properties of WO₃ powders. Current Opinion in Solid State and Materials Science, 2007, 11(1-2): 19-27

[6] SuX, LiY, JianJ, WangJ. In situ etching WO₃ nanoplates: Hydrothermal synthesis, photoluminescence and gas sensor properties. Materials Research Bulletin, 2010, 45(12): 1960-1963

[7] DeepaM, SinghP, SharmaS N, AgnihotryS A. Effect of humidity on structure and electrochromic properties of sol-gel-derived tungsten oxide films. Solar Energy Materials and Solar Cells, 2006, 90(16): 2665-2682

[8] OzkanE, LeeS H, LiuP, TracyC E, TepehanF Z, PittsJ R, DebS K. Electrochromic and optical properties of mesoporous tungsten oxide films. Solid State Ionics, 2002, 149(1-2): 139-146

[9] PyperO, SchollhornR, DonkersJ J T M, KringsL H M. Nanocrystalline structure of WO₃ thin Films prepared by the sol-gel technique. Materials Research Bulletin, 1998, 33(7): 1095-1101

[10] SuL, LuZ. All solid-state smart window of electrodeposited WO₃ and TiO₂ particulate film with PTREFG gel electrolyte. Journal of Physics and Chemistry of Solids, 1998, 59(8): 1175-1180

[11] ChangK H, HuC C, HuangC M, LiuY L, ChangC I. Microwave-assisted hydrothermal synthesis of crystalline WO₃-WO₃٠0.5H₂O mixtures for pseudocapacitors of the asymmetric type. Journal of Power Sources, 2011, 196(4): 2387-2392

[12] GilletM, MasekK, GilletE. Structure of tungsten oxide nanoclusters. Surface Science, 2004, 566-568: 383-389

[13] HidayatD, PurwantoA, WangW N, OkuyamaK. Preparation of size-controlled tungsten oxide nanoparticles and evaluation of their adsorption performance. Materials Research Bulletin, 2010, 45(2): 165-173

[14] HaJ H, MuralidharanP, KimD K. Hydrothermal synthesis and characterization of self-assembled h-WO₃ nanowires/nanorods using EDTA salts. Journal of Alloys and Compounds, 2009, 475(1-2): 446-451

[15] RamanaC V, UtsunomiyaS, EwingR C, JulienC M, BeckerU. Structural stability and phase transitions in WO₃ thin films. Journal of Physical Chemistry B, 2006, 110(21): 10430-10435

[16] HouxN L, PourroyG, CamerelF, CometM, SpitzerD. WO₃ nanoparticles in the 5-30 nm range by solvothermal synthesis under microwave or resistive heating. Journal of Physical Chemistry B, 2010, 114: 155-161

[17] YousB, RobinS, DonnadieuA. Chemical vapor deposition of tungsten oxides: A comparative study by XPS, XRD and RHEED. Materials Research Bulletin, 1984, 19: 1349-1354

[18] PyunS I, KimD J, BaeJ S. Hydrogen transport through r.f. magnetron sputtered amorphous and crystalline WO₃ films. Journal of Alloys and Compounds, 1996, 244(1-2): 16-22

[19] DekiS, BelekeA B, KotaniY, MizuhataM. Synthesis of tungsten oxide thin film by liquid phase deposition. Materials Chemistry and Physics, 2010, 123(2-3): 614-619

[20] AbdullahS F, RadimanS, HamidM A A, IbrahimN B. Effect of calcinations temperature on the surface morphology and crystallinity of tungsten (VI) oxide nanorods prepared using colloidal gas aphrons method. Colloids and Surfaces A, 2006, 280: 88-94

[21] BrinkerC J, SchererG W. Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing. San Diego, USA: Academic Press. Inc., 1990, 2-6

[22] HoG W. Gas sensor with nanostructured oxide semiconductor materials. Science of Advanced Materials, 2011, 3(2): 150-168

[23] SusantiD, NugrohoS H, NisfuH, NugrohoE P, PurwaningsihH, KusumaG E, ShihS J. Comparative analysis of WO₃ nanomaterial synthesized using a sol-gel method followed by calcination and hydrothermal treatments. Frontiers of Chemical Science and Engineering, 2012, 6(4): 371-380

[24] CullityB D, StockS R. Elements of X-Ray Diffraction. 3rd ed. New Jersey, USA: Prentice Hall, 2001, 170-172

[25] SzilágyiI M, MadarászJ, PokolG, KirályP, TárkányiG, SaukkoS, MizseiJ, TòthA L, SzabòA, Varga-JosepovitsK. Stability and controlled composition of hexagonal WO₃. Chemistry of Materials, 2008, 20(12): 4116-4125

[26] DanielM F, DesbatB, LasseguesJ C, GerardB, FiglarzM. Infrared and Raman study of WO₃ tungsten trioxide and WO₃·xH₂O tungsten trioxide hydrate. Journal of Solid State Chemistry, 1987, 67(2): 235-247

[27] TamakiJ, ZhangZ, FujimoriK, AkiyamaM, HaradaT, MiuraN, YamazoeN. Grain-size effects in tungsten oxide-based sensor for nitrogen oxides. Journal of the Electrochemical Society, 1994, 141(8): 2207-2210

[28] KocembaI, RynkowskiJ. The influence of catalytic activity on the response of Pt/SnO₂ gas sensors to carbon monoxide and hydrogen. Sensors and Actuators. B, Chemical, 2011, 155(2): 659-666

Acknowledgements

The authors gratefully acknowledge the financial support and facilities provided by the Ministry of Research and Technology Republic of Indonesia through Applied Research Incentive 2012 No 0161.12/IT2.7/PM/2012 and Institut Teknologi Sepuluh Nopember (ITS)-Surabaya Indonesia through International Collaboration Research Grant 2011 No 0750.042/I2.7/PM/2011.

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