Enhanced CO and CO2 gas sensitivity of the CuO/ZnO heterocontact made by quenched CuO ceramics

Yoshinobu Nakamura, Honxia Zhuang, Akira Kishimoto, Osamu Okada, Hiroaki Yanagida

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The CuO/ZnO heterocontacts for carbon monoxide (CO) gas sensors were made using CuO ceramics with different histories, and their gas sensing characteristics were evaluated. The CuO/ZnO heterocontact made by the quenched CuO sintered compact showed enhanced CO and CO2 gas sensitivity, while that made by slowly cooled CuO showed no selective CO gas-sensing characteristics with no CO2 gas sensitivity. The quenched CuO ceramics were thermodynamically stable but the slowly cooled ones were not; therefore the adsorbed CO molecules on the quenched CuO are thought to be stable and have longer lifetimes. The specific reaction between the adsorbed CO on CuO and adsorbed oxygen on ZnO would be promoted by long lifetime adsorbed CO on CuO and that may be the origin of the enhanced CO gas sensitivity of the quenched-CuO/ZnO heterocontact. The concentrations of cation vacancies of the quenched CuO ceramics can be controlled by controlling the firing temperatures. However, when the CuO ceramics for the CuO/ZnO heterocontact were made by firing and quenching, the ability to be selective in CO gas sensing of the heterocontact was not easily controlled by the control of the defect concentrations of the CuO ceramics.

Original languageEnglish
Pages (from-to)632-638
Number of pages7
JournalJournal of the Electrochemical Society
Volume145
Issue number2
Publication statusPublished - Feb 1998
Externally publishedYes

Fingerprint

Carbon Monoxide
Carbon monoxide
carbon monoxide
Gases
ceramics
gases
life (durability)
Chemical sensors
Vacancies
Cations
Quenching
Positive ions
quenching
histories
Oxygen
cations
Defects
Molecules
sensors
defects

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Enhanced CO and CO2 gas sensitivity of the CuO/ZnO heterocontact made by quenched CuO ceramics. / Nakamura, Yoshinobu; Zhuang, Honxia; Kishimoto, Akira; Okada, Osamu; Yanagida, Hiroaki.

In: Journal of the Electrochemical Society, Vol. 145, No. 2, 02.1998, p. 632-638.

Research output: Contribution to journalArticle

Nakamura, Yoshinobu ; Zhuang, Honxia ; Kishimoto, Akira ; Okada, Osamu ; Yanagida, Hiroaki. / Enhanced CO and CO2 gas sensitivity of the CuO/ZnO heterocontact made by quenched CuO ceramics. In: Journal of the Electrochemical Society. 1998 ; Vol. 145, No. 2. pp. 632-638.
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AU - Yanagida, Hiroaki

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