Ag-WO_3基传感器对NO_2气敏特性的研究
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摘要
Ag-WO_3纳米复合材料通过低温溶胶凝胶法(sol-gel)和共渍法成功合成,并且基于该纳米复合材料制备了检测低浓度NO_2气体的旁热式气敏元件。研究了100～300℃的温度范围内该传感器对H_2S、CO、NO_2、C_2H_5OH、CH_3COCH_3的气敏性能。结果表明,质量分数为1.0%Ag-WO_3气敏传感器对10 ppm的NO_2气体展现了最高的灵敏度和选择性。同时对Ag-WO_3气敏传感器探测气体前后的气敏机理进行了讨论和分析。
The Ag-WO_3 nanocomposites were successfully synthesized by the low-temperature sol-gel method and the impregnating method.Meanwhile,the heater-type gas sensors were made to detect NO_2 in the low concentration range.The gas sensing performance of sensors were studied towards H_2S,CO,NO_2,C_2H_5OH and CH_3COCH_3 gases at 100 ℃ to 300 ℃.The experiment results demonstrated that,1.0% Ag-WO_3 sensor was maximally sensitive and selective towards 10 ppm NO_2 gas.At the same time,the mechanism of Ag-WO_3 gas sensor before and after gas detection was discussed and analyzed.
The Ag-WO_3 nanocomposites were successfully synthesized by the low-temperature sol-gel method and the impregnating method.Meanwhile,the heater-type gas sensors were made to detect NO_2 in the low concentration range.The gas sensing performance of sensors were studied towards H_2S,CO,NO_2,C_2H_5OH and CH_3COCH_3 gases at 100 ℃ to 300 ℃.The experiment results demonstrated that,1.0% Ag-WO_3 sensor was maximally sensitive and selective towards 10 ppm NO_2 gas.At the same time,the mechanism of Ag-WO_3 gas sensor before and after gas detection was discussed and analyzed.
引文
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[2] YAO W,YAO W.Analytical accuracy of hydrogen measurement using gas chromatography with thermal conductivity detection[J].Journal of Separation Science,2015,38(15):2640-2646.
[3] SHEWALE P S,PATIL V B,AGAWANE G L,et al.H2S gas sensing properties of nanocrystalline Cu-doped ZnO thin films prepared by advanced spray pyrolysis [J].Sensors and Actuators B:Chemical,2013,186:226-234.
[4] LIN C L,FANG Y Y,LIN C W,et al.Fabrication of NOx gas sensors using In2O3-ZnO composite films[J].Sen-sors and Actuators B:Chemical,2009,146(1):28-34.
[5] DJERAD S,TIFOUTI L,CROCOLL M,et al.Effect of vanadia and tungsten loadings on the physical andche-mical characteristics of V2O5-WO3/TiO2 catalysts [J].Journal of Molecular Catalysis A Chemical,2004,208(1):257-265.
[6] DAI Z,DAI H,ZHOU Y,et al.Monodispersed Nb2O5 microspheres:facilesynthesis,air/water interfacial self-assembly,Nb2O5-based composite films,and theirselec-tive NO2 sensing[J].Advanced Materials Interfaces,2015,2(11):1500167.
[7] ZHANG W,HU M,LIU X,et al.Synthesis of the cactuslike siliconnanowires/tungsten oxide nanowires compo-site for room-temperature NO2 gas sensor [J].Journal of Alloys and compounds,2016,679(15):391-399.
[8] YIN M,YAN J.Controllable Synthesis of Ag-WO3 core-Shell nanospheres for light-enhanced gas sensors [J].Sensors and Actuators B:Chemical,2017,251:583-589.
[9] ELHAM K H,EHSAN M,CYRUS Z,et al.Nanocasting synthesis of ultrafine WO3nanoparticles for gas sensing applications[J].Nanoscale Research Letters,2010,5(2):370-373.
[10] YAO Y,YIN M,YAN J,et al.Controllable synthesis of Ag-WO3 core-Shell nanospheres for light-enhanced gas sensors [J].Sensors and Actuators B:Chemical,2017,251:583-589.
[11] POONGOGI S,KUMAR P S,MANGALARAJ D,et al.Electrodeposition of WO3 nanostructured thin films for electrochromic and H2S gas sensor applications[J].Jour-nal of Alloys and Compounds,2017,719(30):71-81.
[12] HEIDARIE K,ZAMANI C,MARZBANRAD E,et al.WO3-based NO2 sensors fabricated through lowfrequ-ency AC electrophoretic deposition [J].Sensors and Actuators B:Chemical,2010,146(1):165-170.
[13] SAMERJAI T,TAMAEKONG N,LIEWHIRAN C,et al.NO2 gas sensing of flame-made Pt-loaded WO3 thick films [J].Journal of Solid State Chemistry,2014,214 (214):47-52.
[14] HUA Z,YUASA M,KIDA T,et al.High sensitive gas sensor based on Pd-loaded WO3 nanolamellae [J].Thin Solid Films,2013,548 (24):677-682.
[15] XIA H,WANG Y,KONG F,et al.Au-doped WO3-based sensor for NO2 detection at low operating temperature [J].Sensorsand Actuators B:Chemical,2008,134(1):133-139.
[16] CHEN L,TSANG S C.Ag doped WO3-based powder sensor for the detection of NO gas in air [J].Sensors and Actuators B:Chemical,2003,89 (1-2):68-75.
[17] CHEN D,LI T,CHEN Q,et al.Hierarchically plasmonicphotocatalysts of Ag/AgClnanocrystals coupled with single-crystalline WO3 nanoplates [J].Nanoscale,2012,4(17):5431-5439.
[18] GAO X Y,WANG S Y,LI J,et al.Study of structure and optical properties of silver oxide films by ellipsometry,XRD and XPS methods[J].Thin Solid Films,2004,455-456(1):438-442.
[19] BARSAN N,KOZIEJ D,WEIMAR U.Metal oxide-based gas sensor research:How to?[J].Sensors and Actuators B:Chemical,2007,121(1):18-35.
[20] GOPEL W,SCHIERBAUM K D.SnO2 sensors:current status and future prospects,Sensors and Actuators B:Chemical.1995,26:1-12.
[21] LEBLANC E,PERIER-CAMBY L,THOMAS G,et al.NOx adsorption onto dehydroxylated or hydroxylated tin dioxide surface.Application to SnO2-based sensors [J].Sensors and Actuators B:Chemical,2000,62(1):67-72.
[22] RUHLAND B,BECHER T,MULLER G.Gas-kinetic interactions of nitrous oxides with SnO2 surfaces [J].Sensors and Actuators B:Chemical,1998,50(1):85-94.
[23] HAN S,SHIN W S,SEO M,et al.Improvingperformance of organic solar cells using amorphous tungsten oxides as an interfacial buffer layer on transparent anodes [J].Organic Electronics,2009,10(5):791-797.
[24] BITTENCOURT C,LLOBET E,IVANOV P,et al.Ag induced modifications on WO3 films studied by AFM,Raman and x-ray photoelectron spectroscopy [J].Jour-nal of Physics D Applied Physics,2004,37(24):3383- 3391.
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