Annealing effect on the optoelectronic properties of graphene oxide thin films

Abstract

Graphene oxide (GO) thin films were prepared by solution-casting of non-reduced suspension on glass substrates at ambient conditions. Films were rendered to conductive both with hydrazine treatment and annealing and the results were compared. Annealed films treated without hydrazine revealed superiority over the others. Surface morphology of these films showed very smooth film texture as seen by scanning electron microscope and atomic force microscope. Different optical and electrical parameters were analyzed. Band gap enhanced from 1.25 to 2.4 eV as the solution concentration was decreased where the transmittance increased. This work, in particular represents a straight forward approach compared to other studies to achieve device-quality GO thin films and the findings are important for various optoelectronic applications.

Science and Engineering of Graphene Oxide

“…These studies observe a strong positive correlation between the extracted Tauc gaps and the measured C:O elemental ratio (Figure b,c), suggesting that the band gap of GO could be controlled by carefully tailoring the degree of oxidation of the graphene basal plane. Several methods for doing this have been proposed, such as controlled oxidation, thermal reduction, and reduction with hydrazine vapors . Results obtained using these methods of controlled oxidation/reduction of GO are consistent with changes in conductance .…”

“…Various groups have assigned a “bandgap” to GO by using the Tauc formulation to analyze the optical absorption spectra (Figure b). These studies observe a strong positive correlation between the extracted Tauc gaps and the measured C:O elemental ratio (Figure b,c), suggesting that the band gap of GO could be controlled by carefully tailoring the degree of oxidation of the graphene basal plane.…”

Absorbance response of graphene oxide coated on tapered multimode optical fiber towards liquid ethanol

“…This is as a result of its excellent electrical, mechanical and thermal properties [21]. The hydrophilic nature of GO allows it to be uniformly deposited onto different substrates [22]. This is a prerequisite in applications such as microelectronics and sensors.…”

An Electrochemical Application of MnO2Decorated Graphene Supported Glassy Carbon Ultrasensitive Electrode: Pb2+and Cd2+Analysis of Seawater Samples

“…7 GO contains hydroxyl and epoxide functional groups on the top and bottom of the sheet, whereas the sheet edges are mostly arranged with carboxyl and carbonyl groups. 8,9 Recently, GO has been commonly used as modified electrode material. [10][11][12][13] In an article, Huang et al investigated the multi-walled carbon nanotube (MWCNT) included graphene oxide as electrode material.…”