掺杂纳米WO_3的制备及其气敏性能研究  

Preparation and Gas Sensitivity of Doped WO_3 Nano Materials

作　　者：桂阳海[1] 崔瑞立[1] 牛连杰[1] 张勇[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002

出　　处：《矿产保护与利用》2009年第6期32-35,共4页Conservation and Utilization of Mineral Resources

基　　金：河南省教育厅自然基金(2008B430027);郑州市科技攻关项目(083SGYG23143-1);郑州轻工业学院博士启动基金(2008BSJJ012)

摘　　要：以无机盐为原料,十六烷基三甲基溴化铵CTAB为助剂,采用溶胶-凝胶法制备三氧化钨,研究了La掺杂(0,1%,3%,5%,7%,10%)对WO3基气敏材料性能的影响,并做了贵金属Pd掺杂的探索(掺杂量0.5%);测试了掺杂WO3基厚膜敏感元件对无水乙醇、丙酮、甲苯、二甲苯、甲醛、乙醚、H2S、NOX、苯等的气敏性能,特别是对H2S在不同温度、不同浓度条件下的气敏性做了大量的研究。制备的WO3材料在常温下对极低浓度(5μl/L)H2S也有很好的响应(Sr=5.887)。Pd掺杂(0.5%)能够大大提高元件的敏感性能,对100μl/L苯250℃灵敏度可达到10。通过XRD、BET表征,发现材料颗粒的大小和比表面积分别在84.5 nm和3.69 m2/g。结合相关理论,对试验中气敏现象及机理进行了解释。Sol -gel method was employed to synthesize WO3 nano materials using inorganic salt as a raw material and hexadecyl trimethyl ammonium bromide （CTAB） as additives in this paper. Gas sensitivity of doped WO3 nano materials with La of 0, 1% ,3% ,5% ,7% , 10% and Pd of 0.5% were also investigated, which to the analytes such as ethyl alcohol, acetone, toluene, xylene, formaldehyde, ether, tIES, NOx and benzene. The massive research had been done specially to H2S in the different temperature and gas concentrations condition. The results showed that WO3 nano materials had good gas sensitivity even to low concentration of 5 μl/L H2S （Sr = 5. 887） at normal temperature. The sensor based on WO3 doped with 0.5wt% Pd can dramatically improve the gas sensitivity, whose value get 10 to 100 μl/L benzene under 250℃. By XRD and BET methods, the particle size and specific surface area were 84.5 nm and 3.69 m^2/g, respectively. Experi- mcntal results and gas sensing mechanism were explained using relative theory.

关 键 词：气敏性 WO3 传感器 溶胶-凝胶法 Pd掺杂 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] TQ136.13[自动化与计算机技术—控制科学与工程]