Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 1, Pages 714-719Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp408926n
Keywords
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Funding
- National Natural Science Foundation of China [11135008, 11205158, U1232132, 11175184, 11079032, 11075164]
- National Basic Research Program of China [2012CB825800]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [11321503]
- Fundamental Research Funds for the Central Universities [WK2310000023, WK2310000024, WK2310000026]
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Solvent has a key role in the controllable synthesis of nanocrystals (NCs). Here, using X-ray absorption spectroscopy, we demonstrate that solvent can significantly influence the adsorption of thiols on Au NCs, and thereby affects their growth. It is shown that increasing the solvent polarities leads to the higher thiol coverage on the NC surface. The high coverage of thiols then retards the growth of particles, and as a result, the NCs' sizes decrease with the increase in the solvents' polarities. The underlying reason for the solvent dependence is proposed to be the synergistic effects of different hydrogen bond and hydrophobic interactions between the sulfhydryl and alkyl groups of thiols with the solvents molecules. This work addresses the important role of the solvent environments in the size-controlled synthesis of NCs.
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