The surface gas sensor was prepared by thick film process,and nanometer tungsten trioxide powder was prepared by sol-gel method.Then different amounts of antimony trioxide were added as sensitive materials to obtain La2O3/WO3,and the performance of sensor was tested.It was found that the addition of proper amount of La2O3 inhibited the growth of crystal grains and improved the gas sensitivity of powder materials.La2O3/WO3 sensor with 10% (wt,mass fraction) of La2O3 was used under 3.5V operating voltage.The response voltages for the concentration of 10×10-6 ethanol,acetone,benzene and xylene were 1.7V,2.0V,1.5V and 2.0V,respectively.The response-recovery time of sensor was relatively fast,and the response and recovery time were 5s and 15s.
[1] Wagner T,Haffer S,Weinberger C,et al.Mesoporous materials as gas sensors[J].Chemical Society Reviews,2013,42(9):4036-4053.
[2] Tomer V K,Duhan S.Ordered mesoporous Ag-doped TiO2/SnO2 nanocomposite based highly sensitive and selective VOCs sensor[J].Journal of Materials Chemistry A,2016,4(3):1033-1043.
[3] Zhang C,Debliquy M,Boudiba A,et al.Sensing properties of atmospheric plasma-sprayed WO3 coating for sub-ppm NO2 detection[J].Sensors & Actuators B Chemical,2010,144(1):280-288.
[4] Nayak A K,Ghosh R,Santra S,et al.Hierarchical nanostructured WO3-SnO2 for selective sensing of volatile organic compounds[J].Nanoscale,2015,7(29):12460-12473.
[5] Bamwenda G R,Arakawa H.The visible light induced photocatalytic activity of tungsten trioxide powders[J].Applied Catalysis A(General),2001,210(1/2):181-191.
[6] Xia H,Wang Y,Kong F,et al.Au-doped WO3-based sensor for NO2 detection at low operating temperature[J].Sensors & Actuators B Chemical,2008,134(1):133-139.
[7] Gu H,Wang Z,Hu Y.Hydrogen gas sensors based on semiconductor oxide nanostructures[J].Sensors,2012,12(5):5517-5550.
[8] Ahsan M,Tesfamichael T,Ionescu M,et al.Low temperature CO sensitive nanostructured WO3 thin films doped with Fe[J].Sensors & Actuators B (Chemical),2012,162(1):14-21.
[9] Datta N,Ramgir N,Kaur M,et al.Vacuum deposited WO3 thin films based sub-ppm H2S sensor[J].Materials Chemistry & Physics,2012,134(2/3):851-857.
[10] Choi S J,Lee I,Jang B H,et al.Selective diagnosis of diabetes using Pt-functionalized WO3hemitube networks as a sensing layer of acetone in exhaled breath[J].Analytical Chemistry,2013,85(3):1792-1796.
[11] Gui Y,Dong F,Zhang Y,et al.Preparation and gas sensitivity of WO3 hollow microspheres and SnO2-doped heterojunction sensors[J].Materials Science in Semiconductor Processing,2013,16(6):1531-1537.
[12] Neri G,Bonavita A,Rizzo G,et al.Methanol gas-sensing properties of CeO2-Fe2O3 thin films[J].Sensors & Actuators B(Chemical),2006,114(2):687-695.
[13] Geng X,Luo Y,Zheng B,et al.Photon assisted room-temperature hydrogen sensors using PdO loaded WO3 nanohybrids[J].International Journal of Hydrogen Energy,2017,42(9):6425-6434.
[14] Guidi V,Blo M,Butturi M A,et al.Aqueous and alcoholic syntheses of tungsten trioxide powders for NO2 detection[J].Sensors & Actuators B(Chemical),2004,100(1/2):277-282.
[15] 李强,谢泉,马瑞,等.厚膜电阻的研究现状及发展趋势[J].材料导报,2014,28(7):31-38.
[16] Feng C,Wang C,Cheng P,et al.Facile synthesis and gas sensing properties of La2O3-WO3 nanofibers[J].Sensors & Actuators B(Chemical),2015,221:434-442.
[17] Lee J H.Gas sensors using hierarchical and hollow oxide nanostructures:overview[J].Sensors & Actuators B(Chemical),2009,140(1):319-336.
基金资助
2016河南省产学研会合作项目(162107000015);郑州市技术转移项目(20160043,20160044)
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