Humidity sensor-based ZnO/SnO2 nanocomposite synthesised by sol-gel immersion method Online publication date: Sat, 17-May-2014
by Nor Diyana Md Sin; Mohd Firdaus Malek; Mohamad Hafiz Mamat; Mohamad Rusop Bin Mahmood
International Journal of Materials Engineering Innovation (IJMATEI), Vol. 5, No. 2, 2014
Abstract: ZnO/SnO2 nanocomposite was successfully prepared using sol-gel immersion method. The structural properties of ZnO/SnO2 nanocomposite were characterised using field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction. The optical properties was analysed by photoluminescence (PL). The sensing properties were measured using two point probe current-voltage (I-V) measurement. The sensor characteristics depend on the composition and surface morphology of the thin film. The sensor with ZnO/SnO2 nanocomposite performed the high sensitivity with 69 times from ratio of R40RH% to R90RH% at 25°C. The response and recovery times of ZnO/SnO2 nanocomposite was 290 s and 15 s respectively. The ZnO/SnO2 nanocomposite found to be good repeatability and reproducibility. The humidity sensing mechanism was summarised.
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