Issue 55, 2018, Issue in Progress

Environmentally sustainable route to SiO2@Au–Ag nanocomposites for biomedical and catalytic applications

Abstract

A facile, sustainable, operationally simple and mild method for the synthesis of SiO2@Au–Ag nanocomposites (NCs) using Nephrolepis cordifolia tuber extract is described and its catalytic, antibacterial and cytotoxic properties were investigated. The fabricated SiO2@Au–Ag NCs were well characterized by UV-visible spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), Fourier transform infrared (FT-IR) spectroscopy, powder X-ray diffraction (XRD), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) to determine the optical activity, size and morphology, elemental composition, functional groups present, crystallinity, thermal stability and chemical state respectively. The obtained SiO2@Au–Ag NCs exhibited spherical shape SiO2 decorated with Au and Ag nanoparticles. The diameter of the SiO2 nanoparticles ranges from 200–246 with average 3 nm diameter of Au and Ag NPs. Synthetic utility of this protocol has been demonstrated by exploring its effective catalytic activities for the solvent-free amidation of carboxylic acid with a primary amine with excellent yields. Moreover, the synthesized nanocomposite exhibited as noticeable antibacterial effect against Gram negative and Gram positive bacteria and better bio-compatibility against human keratinocytes. Thus, additive free SiO2@Au–Ag NCs display the potential for catalysis and biomedical applications.

Graphical abstract: Environmentally sustainable route to SiO2@Au–Ag nanocomposites for biomedical and catalytic applications

Supplementary files

Article information

Article type
Paper
Submitted
26 May 2018
Accepted
30 Aug 2018
First published
05 Sep 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 31311-31321

Environmentally sustainable route to SiO2@Au–Ag nanocomposites for biomedical and catalytic applications

K. Sapkota, P. Chaudhary and S. S. Han, RSC Adv., 2018, 8, 31311 DOI: 10.1039/C8RA04502J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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