Abstract
This work presents the sensing properties of reduced graphene oxide/gold (rGO/Au) nano-hybrid thin films under liquefied petroleum gas (LPG) at room temperature. The measurements of the electrical sensitivity of the films exhibit an extremely rapid response (∼ 5 s), fast recovery (∼ 35 s), good reproducibility, high sensitivity and remarkable stability when exposed to a 50 ppm concentration of LPG. The hybrid formation of rGO/Au is confirmed using x-ray diffraction (XRD) pattern, UV–visible absorption spectrometry, Fourier transform infrared (FTIR) spectrometry and scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX) methods. The sensing behavior of the rGO/Au films is compared to graphene oxide and reduced graphene oxide nano-thin films, and the results indicate that the electrical conductivity of the film has significantly improved due to the presence of Au nanoparticles.
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