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
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Thierry Contaret, Jean-Luc Seguin, Philippe Menini, Khalifa Aguir. Physical-Based Characterization of Noise Responses in Metal-Oxide Gas Sensors. IEEE Sensors Journal, Institute of Electrical and Electronics Engineers, 2013, 13 (3), pp.980-986. ⟨10.1109/JSEN.2012.2227707⟩. ⟨hal-02045631⟩

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