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The present paper demonstrated the impedance analysis of Au/TiO2 nanoparticles/Si-Al capacitive sensor for selective detection of VOCs at different frequency regimes. TiO2 nanoparticles (NP) were synthesized through solution process and characterized by Field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) analysis, Photoluminescence spectroscopy, and Atomic force microscopy (AFM). The gas sensitivity of Au/TiO2-NP/Si-Al was investigated, with the effect of temperature modulation (25-250°C) and dielectric variation at the vicinity of nanoparticles. Impedance spectroscopy of TiO2-NP was carried-out to obtain resonant peaks over the frequency ranging from 0.05-225 kHz and fitted with a complex nonlinear least-squares method. The optimum sensor response of 136%, 63%, 152%, and 174% was found at resonant frequencies of 0.38 kHz, 0.22 kHz, 0.15 kHz, and 0.1 kHz for the exposure of 2-propanol, acetone, ethanol, and methanol, respectively. The fastest response time and recovery time were found to be 32/21s, 31.2/8s, 32.5/9s, and 40/26s for acetone, 2-propanol, ethanol, methanol, respectively. Selective detection of different VOCs at various resonant frequencies has correlated with the dielectric variation of the NPs and its associated void region under gas exposure.

Present paper concern room temperature field induced alcohol sensitivity of nanostructured TiO2 thin film in field effect transistor (TFT) configurations. TiO2 thin film were synthesized via low cost solution process...

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