膜厚影响SnO_2厚膜型气敏元件敏感特性的研究

采用丝网印刷技术制备不同膜厚ＳｎＯ２厚膜气敏试样，在不同温度下进行热处理后测定了试样的阻温曲线和对乙醇气体的灵敏度，结果表明制备不同膜厚试样的气体灵敏度不同，阻温曲线也不同．要制备灵敏度高、一致性好的气敏器件，调整控制膜厚和及其热处理温度至关重要．

纳米Ag掺杂SnO_2制备乙醇气敏元件的研究

采用溶胶-凝胶法制备了掺纳米Sb和Ag的SnO_2气敏材料,通过厚膜丝网印刷技术制备成SnO_2气敏元件,测量了元件对乙醇、丙酮、甲醛和甲苯4种气体的气敏性能。测量结果表明,掺杂适量的Sb可以有效降低SnO_2的电阻,提高灵敏度。未掺杂和掺杂Ag的元件在气体浓度为900×10-6时,以上4种气体的灵敏度分别为7.7、6.4、3.86、3.69和33.6、11.7、6.9、17.1。掺杂纳米Ag后,灵敏度对应地提升了336%、203%、79%和363%。

Gas sensing properties of SnO_2 nanoparticles mixed with gold nanoparticles

SnO2nanoparticles mixed with different amounts of gold nanoparticles(GNPs)were synthesized and their CO sensingproperties were investigated.The sol-gel method was employed to prepare the initial solution.SEM,TEM,XRD,DLS andspectrophotometry were used to characterize the nanoparticles.The pure sensors showed a response of about4to12.8for(20-80)×10-6CO at operating temperature of340°C.The response and recovery time at50×10-6Co is about10and14s,respectively.The amount of GNPs optimized was used to create high performance GNP-SnO2sensors(m(Au)/m(Sn)=3.7663×10-4)and optimal operating temperature was about260°C and the response at concentrations of(20-80)×10-6was8.3to29.5,respectively.