Influence of Deposition Temperature as a Reducing Agent on Synthesis of Reduced Graphene Oxide (RGO) Nanosheets

In this paper we have investigated the physical properties of reduced graphene oxide (RGO) thin 􀀜lms prepared at various substrate temperatures of 230, 260, 290, 320 and 350 oC using spray pyrolysis technique. We have compared these 􀀜lms from various viewpoints, including structural, morphological, optical, electrical and thermo-electrical properties. X-ray diffraction analysis showed a phase shift from graphene oxide (GO) to RGO due to elevate the substrate temperature from 200 oC to higher temperatures, in agreement with the FTIR spectra of the layers. FESEM images of RGO thin 􀀜lms revealed stacked irregular folded nanosheets, and rod-like features at temperatures below and above 290 oC; respectively. Optical studies showed that the layers have a relatively high absorption coef􀀜cient (~0.8×104 to 1.7×104 cm−1) in the visible range, with an optical band gap of 1.67–1.88 eV. The Hall effect data showed that all samples have a p-type conductivity with a hole concentration of ~1015 cm−3, and sheet resistance values of about 106 􀀼/square, in agreement with previous reports. The thermoelectric measurements revealed that with increasing applied temperature gradient between the two ends of the samples, the thermoelectric electromotive force (e.m.f) of the prepared RGO thin 􀀜lms increases.