Moleculer Recognition and Decomposition by Functional Ceramics

功能陶瓷的分子识别与分解

基本信息

批准号：
03403013
负责人：
YANAGIDA Hiroaki
金额：
$ 17.54万
依托单位：
Tokyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Selective gas sensing of poisonous gases such as NOx or CO by a simple device is thought to be important technique for the view point of safe environment, control of productivity and control of reaction process and development of decomposition process pf NOx or other atmospheric pollution gases are one of the most important subjects especially for safe environment.Heterocontact is one of the electric devices, of which electrica resistance is changed by the introduction of water vapor, oxidizing gases (NOx , Cl2) or reducing gases (CO,H2). The authors have been studied on the electric properites of hetercontact of ceramics and its application to chemical sensors. When we used CuO (p-type semiconductor) and ZnO(n-type semiconductor) sintered compacts for hueterocontact, the electric current thorough CuO-ZnO interface increased by the introduction of reducing gases and its gas sensitivity varied as a function of applied voltage. The effect of additives on CO gas sensing characteristics of … More CuO or Cuo/ZnO heterocontact is discussed. Some additives affect the CO gas sensing properties of CuO powder compact and CO sensitive surface is constructed by sodium or ther alkali metal addition. Variation in surface properties of CuO by the alkali metal addition would be reflected to gas sensing characteristics of CuO/ZnO heterocontact and Na^+ added CuO/ZnO heterocontact shows selective CO gas sensing characteristics. The result gives us a useful information for the material design of CO sensor based on CuO ceramics or CuO based heterocontact.The nitrogen oxide (No_x) sensing mechanism of SiC/ZnO heterocontact is investigated by thermogravimetric analysis and temperature-programd desorption of surface product on ZnO.A pronounced decrease in electric current was observed only when a SiC/ZnO heterocontact specimen was suffiently exposed to NOx with wet air. From these results, formation of zinc nitrite on the ZnO surface is suggested and it would affect the electron transfer process at the ZnO-SiC interface.CuO/ZnO heterocontct is fabricated by the stacking of 6 layrs of declined composition of CuO-ZnO system and the exhaust gas passing through CuO/ZnO interface is analyzed by gas chromatography with flowing system. The variation of turnover number from CO to CO_2 as a function of applied electric field is observed and electric field controlled CO oxidative reaction at p-n semiconductor interface is performed at CuO-ZnO interface. Less

认为有毒气体（例如NOX或CO）通过简单设备的选择性气体敏感性被认为是对安全环境的观点的重要技术，对生产力的控制，对反应过程的控制以及对反应过程的控制以及分解过程PF NOX或其他大气污染气体的开发是对安全环境的最重要的主题。或减少气体（CO，H2）。作者已经研究了陶瓷杂感的电性能及其在化学传感器上的应用。当我们使用CUO（P型半导体）和ZnO（N型半导体）烧结的紧凑型用于Hueterocontact时，通过引入还原性气体及其气体敏感性随施加伏特的功能而变化，电流基本基本的Cuo-ZnO界面会增加。讨论了添加剂对…更多CUO或CUO/ZnO Heterocontact的CO气体敏感性特征的影响。一些添加剂会影响CUO粉末紧凑的CO气体灵敏度，而CO敏感的表面是通过钠或碱金属添加构建的。碱性添加的CUO表面特性的变化将反映为CUO/ZnO Heterocontact的气体灵敏度特征，而Na^+添加的CuO/ZnO Heterocontact显示出选择性CO气体敏感性特征。 The result gives us a useful information for the material design of CO sensor based on CuO ceramics or CuO based heterocontact.The nitrogen oxide (No_x) sensor mechanism of SiC/ZnO heterocontact is investigated by thermogravimetric analysis and temperature-programd desorption of surface product on ZnO.A pronounced decrease in electric current was observed only when a SiC/ZnO heterocontact specimen用湿空气充分暴露于NOX。从这些结果中，建议在ZnO表面上形成锌亚硝酸盐，并会影响Zno-SIC接口处的电子传输过程。CUO/ZnO Heterocontct是通过堆叠6个差异的Cuo-ZnO系统降低组成的堆叠组成的Cu-ZnO系统和通过Cuo/Zno Interface通过CORMASTICS ANAGERACTY的堆叠组成的。观察到了从CO到CO_2的周转数变化，并且在P-N半导体界面处的电场控制CO氧化反应的变化是在CuO-ZNO界面上进行的。较少的