Effect of Silver on Plasmonic, Photocatalytic, and Cytotoxicity of Gold in AuAgZnO Nanocomposites

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Department of Chemistry, Indian Institute of Technology/Madras, Chennai 600036, India
Centre for Material Science and Nanotechnology, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Sikkim 737102, India
*(P.T.M.) E-mail: [email protected]
Cite this: J. Phys. Chem. C 2017, 121, 16, 9077–9088
Publication Date (Web):April 6, 2017
https://doi.org/10.1021/acs.jpcc.7b02232
Copyright © 2017 American Chemical Society
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Abstract

Four different nanocomposites of AuAgZnO with differing compositions of silver and gold were made by solution combustion method where the EDAX analysis gave the exact composition. Nanocomposites were formed as nanospheres. The composites contained bimetallic AuAg particles on the surface of ZnO semiconductor, the interface being silver. The deconvoluted UV–DRS spectra revealed the presence of two plasmons due to Au and Ag. The amount of gold dominates the AuAg indicating the presence of only a thin layer of silver below gold causing a blue-shifted gold plasmon band and red-shifted silver plasmon band in comparison to their pure entity. The intensity of the former gets increased due to interparticle interaction with silver. Presence of excess gold in one sample of the starting materials tends to form amorphous Au2O3 as proved by both EDAX and XPS. The number of oxygen vacancies in ZnO as seen in EPR depends on AuAg metal content effects the photocatalytic degradation of Rhodamine-B and the photocatalytic production of hydrogen. The interparticle interaction of Ag with Au and ZnO also plays a major role in photocatalytic process. An in vitro cytotoxicity study of AuAgZnO nanocomposites on MCF-7 cell lines is compared with the effect of gold alone in AuZnO. The current study revealed that the presence of silver in the bimetallic system suppresses the efficacy of Au and even ZnO. Gold by itself is a powerful cytotoxic nanoagent even with small amount of ZnO, the latter being known for its nontoxicity. It is interesting to note that Ag has a negative role in cytotoxicity but it contributes positively to photocatalysis.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.7b02232.

  • Figure S1 (EDAX) and Figure S2 (TEM), showing images of S1, S2, S3, and S4 samples, and Figure S3, XPS survey spectrum of sample S4 (PDF)

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