Design of Solid-State Gas Sensor Device Based on Solid Electrolyte Impedance Transducer Attached with Ceramic Receptor

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410240
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Inorganic industrial materials
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: SHIMIZU YOUICHI 九州工業大学, 大学院工学研究院, 教授 (20192114)
• Co-Investigator(Kenkyū-buntansha): TAKASE Satoko 九州工業大学, 大学院工学研究院, 助教 (60239275)
• Research Collaborator: SONG Jeong-Hwan PaiChai University, 准教授
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 化学センサ / ガスセンサ / 固体電解質 / インピーダンス / NOｘ

Outline of Final Research Achievements

Solid-state NOx sensor devices using an Li-ionic conductor (Li1.5Al0.5Ti1.5(PO4)3; LATP) as an impedance transducer and various matrials as a receptor, respectively, wereinvestigated. Among the sensor tested, pyrochlore-type oxide, nitrate (KNO3), zeolite-based devices showed good impedance response properties to NOx. Interestingly, the all metal-carbonate/LATP sensors did not respond to CO2 but gave good responses to NOx. It was found that the use of the binary carbonate (Li2CO3:CaCO3) receptor gave selective responses between NO and NO2, i.e., the response variation values as a function of gas concentration were completely opposite in sign for NO and NO2.
Thin-film NOX sensor device was also fabricated with LATP thin-film as a solid-electrolyte transducer and perovskite-type oxide thin-film as a receptor, respectively. The resistance and capacitance of the device decreased with increasing concentration of NO and NO2 depending on operating temperatures.

Free Research Field

工業物理化学