We study current-voltages and low-frequency noise characteristics of the metal—porous silicon—silicon single crystal—metal structure with 50% and 73% porosity of porous silicon. The study is performed in dry air and in a mix of dry air with carbon monoxide of different concentrations. The Hooge noise parameter $alpha_{H}$ and the parameter $gamma$ in the frequency dependence of the noise voltage spectral density $S_{U}(f)$ were determined from experimental data. High sensitivity of spectral dependence of noise to gas concentration allows offering powerful method for determination of gas concentration in the air or environment.
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