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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Acknowledgment
This work was supported by a Grant-in-Aid for Scientific Research (B) (20360411) from the Ministry of Education, Science, Sports and Culture, Japan. We also thank Ms. Eri Kitahata from the Toray Research Center Inc., Shiga, Japan, for their assistance with TEM observations.
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Ogi, T., Saitoh, N., Nomura, T. et al. Room-temperature synthesis of gold nanoparticles and nanoplates using Shewanella algae cell extract. J Nanopart Res 12, 2531–2539 (2010). https://doi.org/10.1007/s11051-009-9822-8
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DOI: https://doi.org/10.1007/s11051-009-9822-8