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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

从环境安全的角度考虑，NOx或CO等有毒气体的选择性气体传感被认为是一项重要的安全技术，对NOx或其他大气污染气体的生产率控制、反应过程控制和分解过程的开发是特别是对安全环境最重要的课题之一。异触点是一种电子设备，它通过引入水蒸气、氧化性气体(NOx、Cl2)或还原气体(CO、H2)来改变其电阻。本文研究了陶瓷异质接触的电学性质及其在化学传感器中的应用。当我们使用CuO(p型半导体)和ZnO(n型半导体)烧结体进行冷接触时，通过CuO-ZnO界面的电流随着还原气体的引入而增加，其气体灵敏度随外加电压的变化而变化。添加剂对…CO气敏特性的影响讨论了更多的CuO或CuO/ZnO异质接触。添加剂对CuO粉料的CO气敏性能有一定的影响，CO敏感表面是由钠或碱金属的添加构成的。碱金属掺杂对CuO表面性质的影响反映在CuO/ZnO异质接触的气敏特性上，而添加Na+的CuO/ZnO异质接触表现出选择性的CO气敏特性。通过热重分析和表面产物在氧化锌表面的程序升温脱附，研究了碳化硅/氧化锌异质接触的氮氧化物(NOx)敏感机理。只有当碳化硅/氧化锌异质接触样品在湿空气中充分暴露在氮氧化物中时，电流才有明显的下降。结果表明，亚硝酸锌在氧化锌表面的形成影响了氧化锌-碳化硅界面的电子传递过程。CuO-氧化锌体系的6层递减成分堆积形成了CuO/氧化锌异质相，并用流动体系气相色谱分析了通过CuO/氧化锌界面的废气。观察到CO向CO_2的转化数随外加电场的变化，并在CuO-ZnO界面上进行电场控制的p-n半导体界面上的CO氧化反应。较少