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Sensors 2015, 15(4), 8109-8120;

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

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
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)
PDF [3100 KB, uploaded 7 April 2015]


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

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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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