Exploration of Fast Proton Conductors and their Application to New Type Chemical Sensors

快质子导体的探索及其在新型化学传感器中的应用

基本信息

批准号：
63550610
负责人：
MIURA Norio
金额：
$ 1.34万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550610/
关键词：
Proton Conductor Solid Electrolyte Antimonic Acid Chemical Sensor Gas sensor Room Temperature Operation 常温作動型センサプロン導電体

项目摘要

Protonic conducting solid electrolytes (proton conductors) have a remarkable characteristic that only hydrogen ions (protons) can move through the solid material as electrical carriers. By using this property of proton conductors, these materials can be applied to new functional devices in place of conventional liquid electrolytes. Especially in the case of chemical sensors, the use of proton conductors can make it possible to develop new types of all-solid-state chemical sensors, such as cordless sensors, micro sensors, and intelligent sensors. In this study, we first conducted to explore excellent proton conductors with high ionic conductivity as well as high stability, and to clarify the conduction mechanism of proton conductors. Then, we tried to develop new type chemical sensors using proton conductors which can be operated at room temperature.The results obtained in this study are summarized as follows: (1) Among various inorganic ionexchangers examined, antimonic acid and antimo … More ny phosphate were found to have relatively high protonic conductivity and thermal- and chemical-stability. (2) The investigation of protonic conduction mechanism in antimonic acid clarified that the mechanism changed from a hopping-type to a Grotthus-type with an increase in the amounts of adsorbed water. (3) A four-probe type sensor element in which two silver probes were embedded was newly designed. The sensor signal (internal potential difference between two probes) was found to be not only insensitive to humidity but also proportional to hydrogen concentration in air. (4) In order to improve gas selectivity to CO in air of the proton conductor sensor, the use of oxide electrodes, such as WO_3 and SnO_2 in place of Pt electrode, was found to be very effective. (5) The amperometric proton conductor sensors using Nafion membrane and antimonic-acid thick-film could detect both gaseous oxygen and dissolved oxygen in water. These sensors would be applied to transducers of biosensors. (6) The sensor elements using antimonic-acid thick-film fabricated by means of screen-printing method or spin-coating method showed excellent sensing characteristics to H_2 in air at room temperature. Such a thick-film type sensor would be compatible to miniaturization as well as simplification. Less

质子导电固体电解质（质子导体）具有只有氢离子（质子）才能作为电载体穿过固体材料的显着特征，利用质子导体的这一特性，这些材料可以代替传统材料应用于新的功能器件。特别是在化学传感器的情况下，质子导体的使用可以使开发新型全固态化学传感器成为可能，例如无绳传感器、微型传感器和智能传感器。首先探索了具有高离子电导率和高稳定性的优良质子导体，并阐明了质子导体的传导机制，然后尝试开发可在室温下运行的新型质子导体化学传感器。本研究得到的结果总结如下：（1）在所检测的各种无机离子交换剂中，发现锑酸和磷酸锑具有相对较高的质子传导性以及热稳定性和化学稳定性。 (2)对锑酸中的质子传导机制的研究表明，随着吸附水量的增加，该机制从跳跃型转变为格罗图斯型(3)一种四探针型传感器元件，其中两个探针元件。新设计的嵌入银探针的传感器信号（两个探针之间的内部电位差）不仅对湿度不敏感，而且与空气中的氢气浓度成正比（4）以提高气体对CO的选择性。在质子导体传感器的空气中，使用氧化物电极，如WO_3和SnO_2代替Pt电极，被发现是非常有效的。(5)使用Nafion膜和锑酸厚膜的安培质子导体传感器可以。检测水中的气态氧和溶解氧。这些传感器将应用于生物传感器的传感器(6)采用锑酸厚膜制造的传感器元件。丝网印刷法或旋涂法在室温下对空气中的H_2表现出优异的传感特性，这种厚膜型传感器将兼容小型化和简化。