NH_3 gas sensor based on Pd/SnO_2/RGO ternary composite operated at room-temperature

摘要

Novel room-temperature NH_3 gas sensors based on Pd, tin oxide (SnO_2) and reduced graphene oxide (RGO) ternary nanocomposite (Pd/SnO_2/RGO) film were fabricated by the one-pot route. The Pd/SnO_2/RGO ternary nanocomposite films were characterized by Fourier transform infrared spec-troscopy (FTIR), Raman, X-ray diffractometry (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Microstructural observations revealed that the Pd and SnO_2 nanoparticles easily and homogeneously attached to the surface of RGO. The sensor that was based on a Pd/SnO_2/RGO ternary nanocomposite film responded strongly to low concentrations of NH_3 gas at room-temperature. Its better sensor sensitivity than that of the pristine of SnO_2 and SnO_2/RGO nanocomposite film was related to the higher conductivity and catalytic activity of the Pd/SnO_2/RGO ternary nanocomposite film.