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Journal articles
Physical-Based Characterization of Noise Responses in Metal-Oxide Gas Sensors
Abstract : The noise level in the gas microsensors is a tool for characterizing the electrical conduction under various gases and a means to improve selectivity. Metal-oxide gas microsensors with WO 3 sensitive thin film are characterized using a low-frequency noise technique. The spectral form of the noise responses measured using our specific systems is similar for tested gases (ozone and nitrogen dioxide). We observe a clear Lorentzian behavior according to adsorption-desorption (A-D) noise theory. To identify the detected gas, a physical-based characterization model of A-D noise source is proposed and compared with the empirical flicker noise model. We show that the excess noise is due to the A-D processes on the surface of the sensors sensitive film. The Lorentzian parameters depend on the nature of the gases and the noise-level dependence with gas concentration is clearly demonstrated. This confirms the interest on noise spectroscopy to improve the selectivity of gas sensors
Cited literature [15 references]
https://hal.archives-ouvertes.fr/hal-02045631
Contributor : Philippe Menini <>
Submitted on : Monday, May 27, 2019 - 3:15:53 PM
Last modification on : Friday, January 10, 2020 - 9:10:15 PM
Contributor : Philippe Menini <>
Submitted on : Monday, May 27, 2019 - 3:15:53 PM
Last modification on : Friday, January 10, 2020 - 9:10:15 PM
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IEEE Sensors journal 2012- Con...
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