title: Sensing properties of Pd-loaded Co3O4 film for a ppb-level NO gas sensor.
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.
authors: 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. t-akamatsu@aist.go.jp.
authors: Takafumi
authors: T
authors: Akamatsu
authors: 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. itoh-toshio@aist.go.jp.
authors: Toshio
authors: T
authors: Itoh
authors: 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. n-izu@aist.go.jp.
authors: Noriya
authors: N
authors: Izu
authors: 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. w.shin@aist.go.jp.
authors: Woosuck
authors: W
authors: Shin
authors: Department of Mechanical Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-cho, Toyota-shi 470-0392, Japan. sato@aitech.ac.jp.
authors: Kazuo
authors: K
authors: Sato
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D009569:Nitric Oxide; D003035:Cobalt; D010165:Palladium; C060728:cobalt oxide