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Spectrochim Acta A Mol Biomol Spectrosc. 2015 Oct 5;149:396-401. doi: 10.1016/j.saa.2015.04.049. Epub 2015 Apr 24.

Galvanic replacement synthesis of silver dendrites-reduced graphene oxide composites and their surface-enhanced Raman scattering characteristics.

Author information

1
Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC, Australia.
2
Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC, Australia; Department of Chemistry, Hubei Normal University, 435002, China. Electronic address: aiminyu@swin.edu.au.

Abstract

A simple method was developed to synthesize Ag dendrites/reduced graphene oxide (AgD/RGO) composites based on the galvanic displacement method. AgNO3 was used as the precursor for Ag dendrites and aluminum foils served as the sacrifice metal. The as-synthesized AgD/RGO composite was characterized by SEM, FTIR, UV-vis spectroscopy and Raman spectroscopy. The results showed that the graphene oxide was successfully incorporated into the Ag dendritic structure and was reduced during the galvanic displacement between Ag(+) ions and the aluminum foil. XRD analysis revealed that the Ag formed in the composite was in the cubic phase. The surface-enhanced Raman scattering (SERS) property of the as synthesized AgD/RGO composite was evaluated using Rhodamine B as a probe. The composite deposited substrate exhibited a much higher SERS activity compared with substrates modified with Ag dendrites or GO, indicating that the AgD/RGO could potentially be used as a highly sensitive SERS substrate for molecule detecting applications.

KEYWORDS:

Composites; Galvanic replacement; Reduced graphene oxide; Silver dendrites; Surface-enhanced Raman scattering

PMID:
25974672
DOI:
10.1016/j.saa.2015.04.049

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