Sensing Properties of Pd-Loaded Co3O4 Film for a ppb-Level NO Gas Sensor

Sensors

Takafumi Akamatsu¹  Toshio Itoh¹  Noriya Izu¹  Woosuck Shin¹  Kazuo Sato² 

[1] National Institute of Advanced Industrial Science and Technology (AIST), Inorganic Functional Materials Research Institute, 2266-98, Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya-shi 463-8560, Japan; E-Mails:;Department of Mechanical Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-cho, Toyota-shi 470-0392, Japan; E-Mail:

关键词: cobalt oxide;    gas sensor;    nitric oxide;    palladium;   

DOI  :  10.3390/s150408109

来源: mdpi

【 摘 要 】

We prepared 0.1 wt%–30 wt% Pd-loaded Co₃O₄ by a colloidal mixing method and investigated the sensing properties of a Pd-loaded Co₃O₄ sensor element, such as the sensor response, 90% response time, 90% recovery time, and signal-to-noise (S/N) ratio, toward low nitric oxide (NO) gas levels in the range from 50 to 200 parts per billion. The structural properties of the Pd-loaded Co₃O₄ powder were investigated using X-ray diffraction analysis and transmission electron microscopy. Pd in the powder existed as PdO. The sensor elements with 0.1 wt%–10 wt% Pd content have higher sensor properties than those without any Pd content. The response of the sensor element with a 30 wt% Pd content decreased markedly because of the aggregation and poor dispersibility of the PdO particles. High sensor response and S/N ratio toward the NO gas were achieved when a sensor element with 10 wt% Pd content was used.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.