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Sensors 2015, 15(4), 8109-8120; doi:10.3390/s150408109

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

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
2
Department of Mechanical Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-cho, Toyota-shi 470-0392, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 16 February 2015 / Revised: 26 March 2015 / Accepted: 31 March 2015 / Published: 7 April 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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Abstract

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. View Full-Text
Keywords: cobalt oxide; gas sensor; nitric oxide; palladium cobalt oxide; gas sensor; nitric oxide; palladium
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Akamatsu, T.; Itoh, T.; Izu, N.; Shin, W.; Sato, K. Sensing Properties of Pd-Loaded Co3O4 Film for a ppb-Level NO Gas Sensor. Sensors 2015, 15, 8109-8120.

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