Structural analysis of graphene oxide/silver nanocomposites: optical properties, electrochemical sensing and photocatalytic activity

Kumar, Manish and Krishnan, Unni and Devi, Pooja and Kumar, Akshay (2018) Structural analysis of graphene oxide/silver nanocomposites: optical properties, electrochemical sensing and photocatalytic activity. Journal of Materials Science: Materials in Electronics, 29 (1). pp. 10-19. ISSN 0957-4522 (Print) 1573-482X (Online)

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Official URL: https://link.springer.com/article/10.1007/s10854-0...

Abstract

In the present study, graphene oxide/silver (GO/Ag) nanocomposites were synthesized via a facile simple one pot chemical reduction method using ethylene glycol/sodium borohydrate (EG/NaBH4) as solvent and reducing agent. GO was selected as a substrate and stabilizer to prepare GO/Ag nanocomposites. The synthesized GO/Ag nanocomposites were characterized by a series of techniques. Highly monodispersed stable crystalline silver nanoparticles having a face-centered cubic (fcc) phase were confirmed by X-ray powder diffraction (XRD) on GO signature. Scanning electron microscopy images showed that Ag nanoparticles are deposited on the GO sheet with a narrow size distribution. Transmission electron microscopy observations revealed that large numbers of Ag nanoparticles were uniformly distributed on GO sheet and well separated with an average size of 18 nm. Ultraviolet–visible (UV–Vis) spectroscopic results showed the peak of GO and surface plasmon resonance (SPR) of Ag nanoparticles. The SPR property of GO/Ag nanocomposites showed that there was an interaction between Ag nanoparticles and GO sheet. The intensities of the Raman signal of GO/Ag nanocomposites are gradually increased with attachment of Ag nanoparticles i.e. there is surface-enhanced Raman scattering activity. Electrochemical investigations indicated that the nanocomposites possessed an excellent performance for detecting towards 4-nitrophenol. An application of the obtained GO/Ag nanocomposites as a catalyst in the reduction of 4-nitrophenol to 4-aminophenol by NaBH4 was demonstrated. The GO/Ag nanocomposites exhibited high activity and stability for the catalytic reduction of 4-nitrophenol. The prepared GO/Ag nanocomposites act as photo-catalysts.

Item Type: Article
Subjects: CSIO > Materials Science
Divisions: Agri - Instrumentation
Depositing User: Ms. Jyotsana
Date Deposited: 06 Aug 2018 17:23
Last Modified: 06 Aug 2018 17:23
URI: http://csioir.csio.res.in/id/eprint/721

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