Nebulized spray pyrolysis: a new method for synthesis of graphene film and their characteristics

A simple way to synthesis phase pure graphene film from graphene oxide is demonstrated. Dextrose and hydrazine hydrate are used as reducing agents to convert graphene oxide to graphene. The as-synthesized graphene was deposited on glass substrate by nebulized spray pyrolysis technique. The deposited film was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, UV-visible spectroscopy, Scanning electron microscopy and Hall measurement. The electrochemical characteristics of the film are analyzed by electrochemical impedance spectroscopy. The de-oxygenation of graphene oxide is confirmed by XRD, XPS, FTIR and Raman studies. The optical absorption of graphene layers is observed at 290 nm suggesting the transformation of graphene oxide to graphene. The majority carrier in graphene film is found to be holes, indicating p-type conductivity. The carrier mobility and carrier density of the as-deposited graphene are found to be 2.21 x 10(2) cm(2)/Vs and 1.98 x 10(16) cm(-3). The acceptor density and flat band potential are found to be 9.045 x 10(22) cm(-3) and 600 mV respectively. The charge transfer resistance (R-ct), series resistance (R-s) and double layer capacitance (C-dl) of graphene/polysulfide system are found to be 6.57 Omega, 862 Omega and 151 mu F respectively. (C) 2016 Elsevier B.V. All rights reserved.