Development of NOx and CO_2 gas sensor for on-site real-time monitoring

现场实时监测NOx、CO_2气体传感器的研制

基本信息

批准号：
07555576
负责人：
YAMAZOE Noboru
金额：
$ 4.29万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555576/
关键词：
semiconductor sensor solid electrolyte sensor movement measuring nitrogen oxide carbon dioxide auxiliary phase interface structure sodium ion conductor 半導体センサ酸素イオン導電体三酸化タングステン

项目摘要

1. On-site real-time monitoring This test was carried out for CO_2 and NO_2 by using the respective solid electrolyte type sensing devices developed. As far CO_2 monitoring, capability of monitoring variations of CO_2 concentration in a school room over 24 hours, a rapid increase or decrease of indoor CO_2 concentration due to operating oil fan heater and ventilating.2.Interface structure of auxiliaty phase/solid electrolyte For the CO_2 sensing device using Li_2CO_3/MSZ,it was proven that an interfacial compound of Li_2ZrO_3 acts as an ionic bridge and that EMF is generated through a reaction between Li_2ZrO_3 and CO_2. In the case of Li_2CO_3-BaCO_3(or Li_2CO_3-CaCO_3)/NASICON,BaZrO_3 (or CaZrO_3) was found to form inside NASICON,its thickness and structure depending on the carbonate compositions used. It was suggested that these interfacial compounds have deep relevance to the lower temperature sensing capability.Design for practical sensors Practical sensors should be as compact as possible. In this respect, it is necessary to design non-separate-type solid electrolyte devices which don't need particular reference gases. Fortunately, the devices developed here were suited to such design intrinsically. The CO_2 sensor using Li_2CO_3/MSZ and Li_2CO_3-CaCO_3/NASICON could be fabricated into a planar type and a probe type, respectively.The amperometric NO_2 sensor was also a probe type.

1.现场实时监测本次测试采用各自开发的固体电解质型传感装置对CO_2和NO_2进行了测试。 CO_2监测方面，能够监测教室24小时内CO_2浓度的变化，由于油暖风机运行和通风导致室内CO_2浓度快速升高或降低。 2、辅助相/固体电解质界面结构采用Li_2CO_3/MSZ的CO_2传感装置,证明Li_2ZrO_3界面化合物起到离子桥的作用,并且通过两者之间的反应产生电动势Li_2ZrO_3和CO_2。在Li_2CO_3-BaCO_3(或Li_2CO_3-CaCO_3)/NASICON的情况下,发现BaZrO_3(或CaZrO_3)在NASICON内部形成,其厚度和结构取决于所使用的碳酸盐成分。有人认为这些界面化合物与较低的温度传感能力密切相关。实用传感器的设计实用传感器应该尽可能紧凑。在这方面，有必要设计不需要特定参考气体的非分离型固体电解质装置。幸运的是，这里开发的设备本质上适合这种设计。采用Li_2CO_3/MSZ和Li_2CO_3-CaCO_3/NASICON的CO_2传感器可分别制作成平面型和探针型。电流型NO_2传感器也是探针型。