The role of morphology and crystallographic structure of metal oxides in response of conductometric-type gas sensors

By Ghenadii Korotcenkov. 2008

552 citations recorded by the source corpus.

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 (τres), recovery time (τrec), 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.

Subfields: Bioengineering, Biomedical Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/953d2d417c0dbb3d4221d0fc380e1b92e3f75685

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In Bioengineering

In Biomedical Engineering

In Electrical and Electronic Engineering

Citations in the corpus

Metal Oxide Gas Sensors: Sensitivity and Influencing Factors (2010, background): “fully involved in the space-charge layer [3].”
First Fifty Years of Chemoresistive Gas Sensors (2015, background): “It is in fact well recognized that by reducing the particle size of the sensing material in the nanometer range the sensitivity of chemoresistive gas sensors is greatly improved both for the large specific surface offered and for the influence in reducing the surface charge density [21,28–35].”
Conductometric gas sensors based on metal oxides modified with gold nanoparticles: a review (2016, background): “This is quite natural because the gas-sensing effect depends on many factors, including the bulk and surface properties of the oxides, which differ significantly when going from one oxide to another oxide [33, 65].”