Synthesis route of reduced graphene oxide via thermal reduction of chemically exfoliated graphene oxide

Graphene-based nanosheets for stronger and more durable concrete: A review

Strategies for reduction of graphene oxide - a comprehensive review

In this study, one-step preparation method of different heteroatom (-S, -N, -Cl) doped graphene oxide electrodes were achieved as electrode materials for the purpose of high-capacity supercapacitors Microscopic, spectroscopic, and electrochemical methods were used to characterize the prepared electrodes Formation of -ClO2, -ClO3, -SOx (x:2, 3) and -NO2 groups on the graphene oxide-based electrodes were determined by X-ray photoelectron spectroscopy analysis Detail reaction mechanisms were suggested for the formation of these groups on the electrode surface for the first time in the literature Different surface properties of graphene oxide structures in the electrodes were investigated by scanning electron microscopy and atomic force microscopy Electrochemical behaviors of the prepared electrodes were characterized by cyclic voltammetry and electrochemical impedance spectroscopy Sulphur, nitrogen, and chlorine doped graphene oxide electrodes were used as electrode materials for supercapacitor applications Since different heteroatom doped graphene oxide-based electrodes showed different capacitive behavior Areal capacitances of -S, -N and -Cl doped graphene oxide electrodes were determined as 2064 mFcm−2, 5332 mFcm−2 and 1098 mFcm−2, respectively with 10 mAcm−2

Preparation of different heteroatom doped graphene oxide based electrodes by electrochemical method and their supercapacitor applications

Herein, to enhance selective detection of NO2 and SO2 using a single device, an ultraviolet (UV) light activated gas sensor has been reported based on reduced graphene oxide (rGO) functionalized with hollow SnO2 nanofibers (NFs) at room temperature. The porous hollow SnO2 NFs are synthesized using electrospinning and calcination treatment, then different contents of SnO2 are introduced to rGO for preparation of rGO/SnO2 nanocomposites by facile magnetic stirring and ultrasonic treatment. The rGO/SnO2 samples reveal obvious sensing response, great reversibility and good humidity resistance to target gases at ppm level. Under different intensities of UV light illumination, gas sensing properties of rGO/SnO2 are studied to explore the photoexcited sensing behaviors. The greatly enhanced selective detection to NO2 (102%) and SO2 (11%) is achieved with a response ratio of 9.3 by using UV light illumination. The results show sensor response and selectivity can be improved using appropriate intensity of excitation light, demonstrating significant modulation effect of UV light assistance on gas detection. The mechanism may be attributed to light motivated electron-hole pairs due to built-in electric fields under UV light illumination, which can be captured by target gases and lead to UV controlled gas sensing performance.

UV light irradiation enhanced gas sensor selectivity of NO2 and SO2 using rGO functionalized with hollow SnO2 nanofibers

Study of band gap reduction of TiO2 thin films with variation in GO contents and use of TiO2/Graphene composite in hybrid solar cell

Use of graphene nanosheets and barium titanate as fillers in PMMA for dielectric applications

Perovskite absorbers have witnessed a remarkable efficiency increase in last couple of years. To meet the commercialization challenge, reduced cost and improved efficiency are the two critical factors. We report on a hole transport layer free device synthesized under ambient air conditions of high humidity of 50% using TiO2-graphene oxide nanocomposite as electron selective contact. The devices achieved a power conversion efficiency of 5.9%. We introduce a novel synthesis route for TiO2-graphene oxide (GO) composite allowing superior charge transport properties. Incorporation of GO in TiO2 allows achieving higher power conversion efficiencies while working under ambient air conditions. Ambient air synthesis with hole transport free architecture has the potential to reduce the cost of this technology leading to commercial viability.

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Hareema Saleem

Papers

Synthesis route of reduced graphene oxide via thermal reduction of chemically exfoliated graphene oxide

Study of band gap reduction of TiO2 thin films with variation in GO contents and use of TiO2/Graphene composite in hybrid solar cell

Use of graphene nanosheets and barium titanate as fillers in PMMA for dielectric applications

Ambient Air and Hole Transport Layer Free Synthesis: Towards Low Cost CH3NH3PbI3 Solar Cells