期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 438, 期 -, 页码 244-248出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.09.078
关键词
Vibration of adsorbed molecules; Infrared spectroscopy; Metal nanoparticles; Carboxylate
资金
- JSPS [26246005]
- Grants-in-Aid for Scientific Research [26246005] Funding Source: KAKEN
In this paper, we report different coordinations of citrates on gold (AuNP) and silver (AgNP) nanoparticles, as determined using Fourier transform infrared spectroscopy (FTIR) and molecular orbital (MO) calculations. AuNPs and AgNPs are found to have completely different interactions with the carboxylate anchoring groups, as indicated by their unique asymmetric stretching vibrations in the FTIR spectra. The nu(as) (COO-) of citrate exhibits a high-frequency shift resulting from the formation of a unidentate coordination on AuNPs, whereas this vibration exhibits a low-frequency shift as a result of ionic bond formation on AgNPs, as predicted from the MO calculations of the corresponding metal complex salts. The enhancement in the IR signals when their vibration direction was perpendicular to the nanoparticle surface revealed the influence of localized surface plasmons excited on the metal nanoparticles. (C) 2014 Elsevier Inc. All rights reserved.
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