• SANATAN CHATTOPADHYAY

Articles written in Bulletin of Materials Science

• Physical and electrical characterization of reduced graphene oxide synthesized adopting green route

Graphene and its related materials are important areas of research in recent years owing to their unique properties. The wide-range industrial application of graphene-related compounds has led to the development of novel and simple methods for the synthesis of graphene. In this paper, an environmentally friendly green synthesis for the partial reduction of graphene oxide (GO) to reduced GO (RGO) in a cost-effective single-step mechanism was reported. The method completely avoids the use of toxic and environmentally harmful reducing agents commonly used in the chemical reduction of GO to obtain RGO. The reduction of GO was carried out using aqueous leaf extracts of Paederia foetide L. The prepared GO and green RGO were characterized by ultraviolet–visible, Ramanand Fourier transform infra-red spectroscopic analysis which showed a clear indication of the partial removal of oxygen-containing groups from the GO and the formation of RGO. The morphology of the green RGO was characterizedby transmission electron and scanning electron microscopy. Dynamic light scattering was used for zeta potential measurement and correlated with the morphology of the sheets. Electrical conductivity was also measuredto check the extent of reduction of GO to RGO.

• Graphene-nanoparticle incorporated responsivity tuning of p-CuO/n-Si-based heterojunction photodetectors

The current work focusses on investigating the appropriate wt% of graphene-nanoparticles to be incorporated into the CuO film as a dopant for enhancing its optoelectronic properties. CuO and graphene-nanoparticle-incorporatedCuO films (CG) are grown by employing a chemical bath deposition (CBD) method. Graphene-nanoparticles have been incorporated at different wt% (1, 5 and 10%) with respect to the metal salt (CuCl$_2$·${}^2$H$_2$O), and a comparative study has been performed on the systematic change of the film morphology, chemical composition, oxidation states, crystallite structures and photo-sensing effects. It has been found that the morphology and the structural properties of CBD grown CuO films have been tuned by the incorporation of graphene-nanoparticles. The results show a significant enhancement in the optoelectronic properties of CG1 (1%) and CG5 (5%) films. The optical properties of the as-grown films have been observed to be modified by graphene-nanoparticle incorporation. Moreover, the electronic and optoelectroniccharacteristics of the fabricated p-CuO/n-Si heterojunctions have also been investigated. The enhancement of the optoelectronic properties of the CG5 sample as compared to other grown films in the present study suggests thatthe responsivity and photodetecting properties of the CBD grown CuO films can be improved by graphene-nanoparticle incorporation.

• # Bulletin of Materials Science

Volume 45, 2022
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020

Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020

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Posted on July 25, 2019

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