摘要
对于SrTiO3氧气传感器,氧离子在材料表面的吸附控制着材料表面电导率的变化,所以吸附和脱附速率决定氧敏材料的响应时间。研究表明,贵金属作为表面催化剂,可加快气体分子的吸附和脱附速率,提高气敏元件的响应特性。该文在SrTiO3的n型掺杂基础上,加入贵金属Pd作为表面催化剂。实验结果表明,以Pd作为催化剂的样品,其响应时间缩短,接近气体传感器的实用要求。
For SrTiO3 oxygen sensor as a kind of gas sensor, the absorption of oxygen ions controls the conductivity of materials surface, hence the velocity of the absorption and the desorption determines the response time. Nu- merous experiments shows that the absorption and the desorption could be significantly accelerated by employing the precious metal as the surface catalyst, thereby, improving the response property. In this article, we use Pd as the surface catalyst, and the result indicates that Pd greatly cut the response time to a few seconds, approaching the practical demands.
出处
《压电与声光》
CSCD
北大核心
2009年第1期74-76,共3页
Piezoelectrics & Acoustooptics
基金
陕西省自然科学基金资助项目(2002F10)
