NDLI: Microwave-assisted biosynthesis of gold–silver alloy nanoparticles and determination of their Au/Ag ratio by atomic absorption spectroscopy

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Microwave-assisted biosynthesis of gold–silver alloy nanoparticles and determination of their Au/Ag ratio by atomic absorption spectroscopy

Content Provider	Taylor & Francis Online
Author	Abdi, Khosro Ahmadi, Seyed Hamid Nori, Narges Mokhtari Shahverdi, Ahmad Reza Lamei, Navid Khoshayand, Mohammad Reza
Abstract	In this investigation, our research interest focused on the microwave-assisted biosynthesis of Au–Ag alloy nanoparticles and their purification and characterisation. Dextrose and the ethanol extract of black tea (Camellia sinensis) were used as natural reducing agents for preparing Au–Ag alloy nanoparticles under microwave irradiation. The synthesised alloy nanoparticles were further purified with the agarose gel electrophoresis technique. The characterisation of the separated nanoparticles as particle shapes, size and their chemical composition was studied with UV–Vis spectroscopy, transmission electron microscopy and atomic absorption spectroscopy. Purified Ag–Au alloy nanoparticles were spherical in the size range of ≤200 nm, and possessed an average size of 92 nm. The results of atomic absorption spectroscopy show the presence of both metals (gold and silver) in the purified bimetal nanoparticles at a molar ratio of 3 : 1. Although we selected the Au3+/Ag+ mixture solution with a molar ratio of 1/1, we did not obtain Au–Ag alloy nanoparticles with the same portion. In the further investigation using resolution IV 2(4−1) fractional factorial design, we established that the final concentrations of glucose and plant extract should be considered the main significant parameters affecting the Ag/Au ratio in the Ag–Au alloy nanoparticles.
Starting Page	442
Ending Page	450
Page Count	9
File Format	PDF HTM / HTML
ISSN	17458080 17458099
DOI	10.1080/17458080.2011.591003
Journal	Journal of Experimental Nanoscience
Volume Number	8
Issue Number	4
Language	English
Publisher	Taylor & Francis Group
Publisher Date	2013-04-17
Access Restriction	Open
Subject Keyword	Gold–silver alloy nanoparticles Biosynthesis Black tea Dextrose Camellia sinensis Experimental design
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Science Bioengineering Biomedical Engineering

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