Characterization of citrates on gold and silver nanoparticles

Priastuti Wulandari; Takeshi Nagahiro; Nobuko Fukada; Yasuo Kimura; Michio Niwano; Kaoru Tamada

doi:10.1016/j.jcis.2014.09.078

Characterization of citrates on gold and silver nanoparticles

Priastuti Wulandari, Takeshi Nagahiro, Nobuko Fukada, Yasuo Kimura, Michio Niwano, Kaoru Tamada

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27 Citations (Scopus)

Abstract

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 ν_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.

Original language	English
Pages (from-to)	244-248
Number of pages	5
Journal	Journal of Colloid And Interface Science
Volume	438
DOIs	https://doi.org/10.1016/j.jcis.2014.09.078
Publication status	Published - 2015 Jan 5

Keywords

Carboxylate
Infrared spectroscopy
Metal nanoparticles
Vibration of adsorbed molecules

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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Wulandari, P., Nagahiro, T., Fukada, N., Kimura, Y., Niwano, M., & Tamada, K. (2015). Characterization of citrates on gold and silver nanoparticles. Journal of Colloid And Interface Science, 438, 244-248. https://doi.org/10.1016/j.jcis.2014.09.078

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abstract = "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 νas (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.",

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AU - Wulandari, Priastuti

AU - Nagahiro, Takeshi

AU - Fukada, Nobuko

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AU - Niwano, Michio

AU - Tamada, Kaoru

PY - 2015/1/5

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KW - Infrared spectroscopy

KW - Metal nanoparticles

KW - Vibration of adsorbed molecules

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