Room-temperature synthesis of gold nanoparticles and nanoplates using Shewanella algae cell extract |
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Authors: | Takashi Ogi Norizoh Saitoh Toshiyuki Nomura and Yasuhiro Konishi |
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Institution: | (1) Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan; |
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Abstract: | Biosynthesis of spherical gold nanoparticles and gold nanoplates was achieved at room temperature and pH 2.8 when cell extract
from the metal-reducing bacterium Shewanella algae was used as both a reducing and shape-controlling agent. Cell extract, prepared by sonicating a suspension of S. algae cells, was capable of reducing 1 mol/m3 aqueous AuCl4
− ions into elemental gold within 10 min when H2 gas was provided as an electron donor. The time interval lapsed since the beginning of the bioreductive reaction was found
to be an important factor in controlling the morphology of biogenic gold nanoparticles. After 1 h, there was a large population
of well-dispersed, spherical gold nanoparticles with a mean size of 9.6 nm. Gold nanoplates with an edge length of 100 nm
appeared after 6 h, and 60% of the total nanoparticle population was due to gold nanoplates with an edge length of 100–200 nm
after 24 h. The yield of gold nanoplates prepared with S. algae extract was four times higher than that prepared with resting cells of S. algae. The resulting biogenic gold nanoparticle suspensions showed a large variation in color, ranging from pale pink to purple
due to changes in nanoparticle morphology. |
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