Extracellular biosynthesis of monodispersed gold nanoparticles by a SAM capping route |
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Authors: | Li Wen Zhonghua Lin Pingying Gu Jianzhang Zhou Bingxing Yao Guoliang Chen Jinkun Fu |
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Institution: | (1) Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Simingnanlu 422, Xiamen, 361005, China;(2) State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Simingnanlu 422, Xiamen, 361005, China;(3) School of Life Sciences, Xiamen University, Simingnanlu 422, Xiamen, 361005, China |
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Abstract: | Monodispersed gold nanoparticles capped with a self-assembled monolayer of dodecanethiol were biosynthesized extracellularly
by an efficient, simple, and environmental friendly procedure, which involved the use of Bacillus megatherium D01 as the reducing agent and the use of dodecanethiol as the capping ligand at 26 °C. The kinetics of gold nanoparticle
formation was followed by transmission electron microscope (TEM) and UV-vis spectroscopy. It was shown that reaction time
was an important parameter in controlling the morphology of gold nanoparticles. The effect of thiol on the shape, size, and
dispersity of gold nanoparticles was also studied. The results showed that the presence of thiol during the biosynthesis could
induce the formation of small size gold nanoparticles (<2.5 nm), hold the shape of spherical nanoparticles, and promote the
monodispersity of nanoparticles. Through the modulation of reaction time and the use of thiol, monodispersed spherical gold
nanoparticles capped with thiol of 1.9 ± 0.8 nm size were formed by using Bacillus megatherium D01. |
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Keywords: | Gold nanoparticles Extracellular biosynthesis Monodispersity Control of particle size Self-assembled monolayer Nanobiotechnology |
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