期刊
MATERIALS SCIENCE & ENGINEERING R-REPORTS
卷 61, 期 1-6, 页码 1-39出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.mser.2008.02.001
关键词
metal oxides; polycrystalline; one-dimensional; gas sensor; sensor response; morphology and crystallographic structure influence
资金
- National Research Foundation of Korea [2007-208-D00023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This review paper discusses the influence of morphology and crystallographic structure on gas-sensing characteristics of metal oxide conductometric-type sensors. The effects of parameters such as film thickness, grain size, agglomeration, porosity, faceting, grain network, surface geometry, and film texture on the main analytical characteristics (absolute magnitude and selectivity of sensor response (S), response time (tau(res)), recovery time (tau(rec)), and temporal stability) of the gas sensor have been analyzed. A comparison of standard polycrystalline sensors and sensors based on one-dimension structures was conducted. It was concluded that the structural parameters of metal oxides are important factors for controlling response parameters of resistive type gas sensors. For example, it was shown that the decrease of thickness, grain size and degree of texture is the best way to decrease time constants of metal oxide sensors. However, it was concluded that there is not universal decision for simultaneous optimization all gas-sensing characteristics. We have to search for a compromise between various engineering approaches because adjusting one design feature may improve one performance metric but considerably degrade another. (c) 2008 Elsevier B.V. All rights reserved.
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