INOR 653 |
| Various shapes of gold nanocrystals were synthesized from the reduction of tetrachlorauric acid (HAuCl4) by cytochrome c (cyt c). At neutral pH, 50 mM of Cl- and Br- increased the growth rate of the gold nanocrystals, while I- retarded the formation of gold nanocrystals. In the presence of Cl- the gold nanoparticles formed distorted spheres. In the presence of Br- multiple shapes such as triangular, hexagonal nanoplates, decahedral particle and nanorod were formed. The characteristic absorption band at 610 nm is the indication of multiple shapes. At pH 3, the Cl- containing cyt c- HAuCl4 solution showed a pronounced 610 nm absorbance. We conclude that anions (i.e. Cl-, Br-) present in the solution can regulate the shapes of gold nanocrystals due to their ability of adsorbed on a particular direction in the process of gold nanocrystals formation. |
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Nanoscience: Synthesis and Characterization
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Inorganic Chemistry |