In Situ Observation of Nucleation and Growth Process of Gold Nanoparticles by Quick XAFS Spectroscopy

Right here, right now: In situ time‐resolved quick X‐ray absorption fine‐structure spectroscopy was used to clarify the formation process of gold nanoparticles (AuNPs) from a toluene solution of HAuCl4 by NaBH4 reduction in the presence of dodecanethiol as a passivant. The spectral analysis revealed...

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Veröffentlicht in:	Chemphyschem 2011-01, Vol.12 (1), p.127-131
Hauptverfasser:	Ohyama, Junya, Teramura, Kentaro, Higuchi, Yasuhiro, Shishido, Tetsuya, Hitomi, Yutaka, Kato, Kazuo, Tanida, Hajime, Uruga, Tomoya, Tanaka, Tsunehiro
Format:	Artikel
Sprache:	eng
Schlagworte:	Chemical synthesis methods Cross-disciplinary physics: materials science rheology Exact sciences and technology EXAFS spectroscopy gold Gold - chemistry Materials science Metal Nanoparticles - chemistry Methods of nanofabrication nanoparticles Physics Spectrometry, X-Ray Emission X-ray absorption spectroscopy
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Beschreibung
Zusammenfassung:	Right here, right now: In situ time‐resolved quick X‐ray absorption fine‐structure spectroscopy was used to clarify the formation process of gold nanoparticles (AuNPs) from a toluene solution of HAuCl4 by NaBH4 reduction in the presence of dodecanethiol as a passivant. The spectral analysis revealed that AuNPs are formed by NaBH4 reduction of Au ions via small Au nuclei. A Au4 cluster is proposed as an example of their possible structure (see picture). The analysis also elucidates the time course of the growth of AuNPs.
ISSN:	1439-4235 1439-7641
DOI:	10.1002/cphc.201000731