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

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...

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Bibliographic Details
Published in:RSC advances 2018-01, Vol.8 (55), p.31311-31321
Main Authors: Sapkota, Kanti, Chaudhary, Prerna, Han, Sung Soo
Format: Article
Language:English
Subjects:
Biocompatibility
Biomedical materials
Catalysis
Chemistry
Energy transmission
Fourier transforms
Functional groups
Gold
Infrared analysis
Infrared spectroscopy
Morphology
Nanocomposites
Nanoparticles
Optical activity
Organic chemistry
Silicon dioxide
Silver
Spectrum analysis
Thermal stability
Thermogravimetric analysis
Transmission electron microscopy
X ray photoelectron spectroscopy
X ray powder diffraction
X-ray diffraction
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Summary: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.
ISSN:2046-2069
2046-2069
DOI:10.1039/c8ra04502j