Well-Aligned Graphene Oxide Nanosheets Decorated with Zinc Oxide Nanocrystals for High Performance Photocatalytic Application

Abstract

Graphene oxide (GO) nanosheets modified with zinc oxide nanocrystals were achieved by a green wet-chemical approach. As-obtained products were characterized by XRD, Raman spectra, XPS, HR-TEM, EDS, PL and Photocatalytic studies. XRD studies indicate that the GO nanosheet have the same crystal structure found in hexagonal form of ZnO . The enhanced Raman spectrum of 2D bands confirmed formation of single layer graphene oxides. The gradual photocatalytic reduction of the GO nanosheet in the GO : ZnO suspension of ethanol was studied by using X-ray photoelectron (XPS) spectroscopy. The nanoscale structures were observed and confirmed using high resolution transmission electron microscopy (HR-TEM). The evolution of the elemental composition, especially the various numbers of layers were determined from energy dispersive X-ray spectra (EDS). PL properties of GO : ZnO nanosheet were found to be dependent on the growth condition and the resultant morphology revealed that GO nanosheet were highly transparent in the visible region. The photocatalytic performance of GO : ZnO nanocomposites was performed under UV irradiation. Therefore, the ZnO nanocrystals in the GO : ZnO composite could be applied in gradual chemical reduction and consequently tuning the electrical conductivity of the graphene oxide nanosheet.

Evolution of oxygen functionalities in graphene oxide and its impact on structure and exfoliation: An oxidation time based study

“…With its exceptional physiochemical and electrical properties, graphene has attracted significant attention as a primary raw material in developing new technologically advanced materials. These include areas such as nanocomposites, functional coatings, paints and electrode materials for chemical and biological sensing [1][2][3][4][5][6][7][8][9]. However the demand for graphene applications will essentially be driven by the progress in scalability of the production of graphene with properties appropriate for the said applications.…”

Mechanochemical Reinforcement of Graphene Sheets into Alkyd Resin Matrix for the Development of Electrically Conductive Paints

“…The Raman spectra of GO and graphene sheets are shown in Figure (c) which shows the presence of D and G band in both samples with significant changes in the peak position. The G band in GO is located at 1596 cm −1 which is red‐shifted towards 1581 cm −1 for graphene which revealed the removal of sp 3 contents in GO due to the re‐graphitization process during the mechanochemical reduction reaction ,. The ratio of the intensities of D and G bands (I D /I G ) can be correlated to the sp 2 domains present in the carbon materials ,.…”

“…The G band in GO is located at 1596 cm À1 which is red-shifted towards 1581 cm À1 for graphene which revealed the removal of sp 3 contents in GO due to the re-graphitization process during the mechanochemical reduction reaction. [26,27] The ratio of the intensities of D and G bands (I D /I G ) can be correlated to the sp 2 domains present in the carbon materials. [28,29] The I D /I G ratio of graphene is about 0.85 which is higher compared to that of GO (about 0.8), thus, highlighting the removal of oxygen containing functional groups in GO after reduction reaction.…”

Green Combustion Synthesis of CeO2 and TiO2 Nanoparticles Doped with Same Oxide Materials of ZrO2: Investigation of in vitro Assay with Antibiotic Resistant Bacterium (ARB) and Anticancer Effect

“…The significant candidate of anticancer drug is the ability to induce tumor cell apoptosis [34,[35][36][37]. The basic cytotoxic assay to assess anticancer activity is MTT assay.…”