采用水热法,在160℃下反应48h制得方块状的WO3纳米孔柱阵列,并使用扫描电镜和X射线衍射仪对样品进行了物相和形貌分析。为验证该材料在湿度感应方面的结构优势,制作了基于单块WO3方块的微型湿度感应器。测试结果显示,在相对湿度为20%～75%的范围内,感应器的电阻几乎随相对湿度的增加而线性减小;感应器对在20%和60%两者间周期性变化的湿度表现出极快速的响应（约2s）,且具有良好的稳定性和重复性。分析表明质子导电对该感应器的湿度感应起主要贡献。
Square-like WO3 nanoporous pillar arrays were prepared by a hydrothermal process at 160℃ for 48h.The phase and morphology of the product were characterized by scanning electron microscopy and X-ray diffraction spectroscopy.A micro-humidity sensor based on a single piece of WO3 square was fabricated,for proving the superiority of the as-synthesized material in structure.It was shown that the resistance of the sensor decreased almost in a linear way,with the increase of the relative humidity from 20% to 75%.It was also found that when the relative humidity in atmosphere changed periodically between 20% and 60%,the sensor responded fast（about 2s） with excellent stability and repeatability.Analysis indicated that the protonic conductivity played a leading role in the sensing process of the humidity sensor.
参考文献
| [1] | Bechinger C.;Zhang JG.;Burdis MS. .COMPARISON BETWEEN ELECTROCHROMIC AND PHOTOCHROMIC COLORATION EFFICIENCY OF TUNGSTEN OXIDE THIN FILMS[J].Solid State Communications,1997(10):753-756. |
| [2] | Di Chen;Jinhua Ye .Hierarchical WO_3 Hollow Shells: Dendrite, Sphere, Dumbbell, and Their Photocatalytic Properties[J].Advanced functional materials,2008(13):1922-1928. |
| [3] | J. L. solis;S. Saukko;L. Kish;C. G. Granqvist;V. Lantto .Semiconductor gas sensors based on nanostructured tungsten oxide[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2001(2):255-260. |
| [4] | Gillet M;Aguir K;Bendahan M;Mennini P .Grain size effect in sputtered tungsten trioxide thin films on the sensitivity to ozone[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2005(1/2):358-363. |
| [5] | G V KUNTE;UJWALA AIL;S A SHIVASHANKAR .Dip-coated hydrotungstite thin films as humidity sensors[J].Bulletin of Materials Science,2005(3):243-248. |
| [6] | Qu WM.;Wlodarski W. .A thin-film sensing element for ozone, humidity and temperature[J].Sensors and Actuators, B. Chemical,2000(1/3):42-48. |
| [7] | Sriyudthsak M;Supothina S .Humidity-insensitive and low oxygen dependence tungsten oxide gas sensors[J].Sensors and Actuators, B. Chemical,2006(1):265-271. |
| [8] | Labidi A;Gillet E;Delamare R;Maaref M;Aguir K .Ethanol and ozone sensing characteristics of WO3 based sensors activated by Au and Pd[J].Sensors and Actuators, B. Chemical,2006(1):338-345. |
| [9] | Patil D;Seo YK;Hwang YK;Chang JS;Patil P .Humidity sensing properties of poly(o-anisidine)/WO3 composites[J].Sensors and Actuators, B. Chemical,2008(2):374-382. |
| [10] | Pokhrel S.;Nagaraja KS. .Electrical and humidity sensing properties of molybdenum(VI) oxide and tungsten(VI) oxide composites[J].Physica Status Solidi, A. Applied Research,2003(2):343-349. |
| [11] | Dong, YF;Li, LY;Jiang, WF;Wang, HY;Li, XJ .Capacitive humidity-sensing properties of electron-beam-evaporated nanophased WO3 film on silicon nanoporous pillar array[J].Physica, E. Low-dimensional systems & nanostructures,2009(4):711-714. |
| [12] | Parvatikar N;Jain S;Khasim S;Revansiddappa M;Bhoraskar SV;Prasad MCNA .Electrical and humidity sensing properties of polyaniline/WO3 composites[J].Sensors and Actuators, B. Chemical,2006(2):599-603. |
| [13] | Suri K.;Annapoorni S.;Sarkar AK.;Tandon RP. .Gas and humidity sensors based on iron oxide-polypyrrole nanocomposites[J].Sensors and Actuators, B. Chemical,2002(2/3):277-282. |
| [14] | Agmon N. .THE GROTTHUSS MECHANISM[J].Chemical Physics Letters,1995(5-6):456-462. |
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