摘要
采用湿化学法和厚膜技术制备了掺Sb_2O_2的SnO_2半导体陶瓷以测试其酒敏特性。发现在这种陶瓷中掺杂γ-Al_2O_3可大幅度提高其对乙醇的灵敏度。用程序升温脱附实验TPD(Tcmperature Programmed Desorption)研究了这种材料的敏感过程,并提出了新的酒敏机理,即在Al_2O_3催化下,乙醇脱水生成乙烯,乙烯极易氧化,因而降低了工作温度,提高了灵敏度及对乙醇的选择性。
(Luoyang Institute of Refractories Research, Ministry of Metallurgical Industry) ABSTRACT Sb<sub>1</sub>O<sub>3</sub>-doped SnO<sub>2</sub> semiconductor ceramics was prepared by means of wet-chemical method and thick film technology and its ethanol-sensing characteristics were measured. It is found that the sensitivity to ethanol is greatly improved by doping with Υ-Al<sub>2</sub>O<sub>3</sub> in this kind of ceramics The temperature programmed desorption （TPD） experiment was carried out to study the ethanolsensing process of the ceramics, and a new mechanism for the improvement of sensitivity to ethanol is proposed. The new ethanol-sensing mechanism was discovered that ethanol was dehydrated by Al<sub>2</sub>O<sub>3</sub> （not dehydrogenated as usual） and the produced ethylene was directly adsorbed on the sensing surface of SnO<sub>2</sub> and then was oxidized.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1993年第2期193-196,共4页
Journal of The Chinese Ceramic Society
关键词
半导体陶瓷
湿化学法
厚膜技术
semiconductor ceramics
wet-chemical method
thick film technology
