w^6＋掺杂TiO2纳米材料化学吸附与氧敏特性研究  

Chemical absorption and oxygen sensitivity of TiO2 doped by W^6＋

作　　者：赖正全 潘海波[1] 李世云[1] 

机构地区：[1]福州大学功能材料研究所,福建福州350002

出　　处：《功能材料》2007年第A07期2415-2417,共3页Journal of Functional Materials

基　　金：福建省重大专项资助项目（2005HZ01-2-6）.致谢：感谢福州大学引进人才基金的资助.

摘　　要：以TiCl3为钛源，采用溶胶-凝胶法制备W^6＋掺杂TiO2纳米粉体，经400℃低温烧结1h，即可得到以金红石相为主相的TiO2基氧敏材料。采用XRD、BET、TPD等手段对其进行表征、分析，结果表明W^6＋掺杂有利于形成以金红石相为主相的晶体结构，使样品的晶粒尺寸减小、比表面积增加，使氧敏特性提高，其中12％（摩尔分数）W^6＋／TiO2的氧气化学吸附量最大，敏感层表面对氧气的活性最高；在低工作条件（115℃）及1×10^-4氧气下，W^6＋掺杂TiO2的厚膜型气敏元件氧敏特性得以明显提高，且掺杂12％（摩尔分数）W^6＋灵敏度最佳（S=16．5）。TiO2 nanosized powders doped with W^6＋ were prepared by sol - gel technique using TICl3. It indicates that ruffle TiO2 can be obtained at low annealing temperature （400℃, 1h） . Characterization of the material was performed by using XRD, BET and TPD. The crystallize size is suppressed by doping W^6＋ ,the specific su.face area and the oxygen sensitivity is increased compared with pure TiO2 under low operating temperature （115℃） and 100ppm oxygen concentration. The oxygen sensitivity of W6 ＋/TiO2 is better than that of pure TiO2 due to the enhancing of electronic concentration by doping W^6＋, and a sensitivity of sensor based on 12%mol%W^6＋/TiO2 is up to S= 16.5, where this nanomaterials has the highest quantity for oxygen absorption.

关 键 词：TIO2 W^6+掺杂 氧敏传感器 气敏机理 

分 类 号：TB381[一般工业技术—材料科学与工程]