期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 8, 期 4, 页码 792-799出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201201105
关键词
gold; nanocrystals; nanostructures; self-assembly; size control
资金
- NSF [DMR-1215034]
- Georgia Institute of Technology
- China Scholarship Council
Single-crystal gold nanospheres with controlled diameters in the range 530nm were synthesized by using a facile approach that was based on successive seed-mediated growth. The key to the success of this synthesis was the use of hexadecyltrimethylammonium chloride (CTAC) as a capping agent and a large excess of ascorbic acid as a reductant to ensure fast reduction and, thus, single crystallinity and a spherical shape of the resultant nanoparticles. The diameters of the gold nanospheres could be readily controlled by varying the amount of seeds that were introduced into the reaction system. The gold nanospheres could be produced with uniform diameters of up to 30nm; thus, their localized surface plasmon resonance properties could be directly compared with the results that were obtained from theoretical calculations. Interestingly, we also found that these gold nanospheres self-assembled into dimers, larger aggregates, and wavy nanowires when they were collected by centrifugation, dispersed in deionized water, and then diluted to different volumes with deionized water.
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