Title: Humidity sensor-based ZnO/SnO2 nanocomposite synthesised by sol-gel immersion method

Authors: Nor Diyana Md Sin; Mohd Firdaus Malek; Mohamad Hafiz Mamat; Mohamad Rusop Bin Mahmood

Addresses: NANO-ElecTronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia ' NANO-ElecTronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia ' NANO-ElecTronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia ' NANO-ElecTronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia; NANO-SciTech Centre (NST), Institute of Science (IOS), Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia

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.

Keywords: ZnO/SnO2 nanocomposites; zinc oxide; tin dioxide; tin oxide; nanocubes; ZnO nanorods; SnO2 nanoparticles; humidity sensors; nanotechnology; sol-gel immersion; structural properties; optical properties.

DOI: 10.1504/IJMATEI.2014.060343

International Journal of Materials Engineering Innovation, 2014 Vol.5 No.2, pp.159 - 170

Available online: 10 Apr 2014 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article