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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS I18-Microfocus Spectroscopy	Electrochemical insight into the brust–schiffrin synthesis of Au nanoparticles Akihiro Uehara , Samuel Booth , Sin-Yuen Chang , Sven L. M. Schroeder , Takahito Imai , Teruo Hashimoto , J. Frederick W. Mosselmans , Robert A. W. Dryfe Journal Of The American Chemical Society 137 (48), 15135–15144 DOI: 10.1021/jacs.5b07825 PMID: 26559785 Diamond Proposal Number(s): [11293, 8861] Open Access Show Abstract ▼ Abstract: The mechanism of the Brust-Schiffrin gold nanoparticle synthesis has been investigated through the use of ion transfer voltammetry at the water\|1,2-dichloroethane (DCE) solution interface, combined with X-ray absorption fine structure (XAFS) of the reaction between [AuCl4]- and thiol (RSH) in homogeneous toluene (TL) solution. Ion transfer calculations indi- cate the formation of [AuCl2]- at RSH:Au ratios from 0.2 – 2 with a time-dependent variation observed over several days. At RSH:Au ratios above 2 and after time periods greater than 24 hours, the formation of Au(I)SR is also observed. The relative concentrations of reaction products observed at the liquid/liquid interface are in excellent agreement with those observed by XAFS for the corresponding reaction in a single homogeneous phase. BH4- ion transfer reactions between water and DCE indicate that the reduction of [AuCl4]- and/or [AuCl2]- to Au nanoparticles by BH4- proceeds in the bulk organic phase. On the other hand, BH4- was unable to reduce the insoluble [Au(I)SR]n species to Au nanoparticles. The number and size of the nanoparticles formed was dependent on the concentration ratio of RSH:Au, as well as the experimental duration because of the competing formation of the [Au(I)SR]n precipitate. Higher concentrations of nanoparticles, with diameters of 1.0 – 1.5 nm, were formed at RSH:Au ratios from 1 to 2.	Nov 2015

Instruments / Technical Area

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B18-Core EXAFS
I18-Microfocus Spectroscopy

Electrochemical insight into the brust–schiffrin synthesis of Au nanoparticles

Akihiro Uehara , Samuel Booth , Sin-Yuen Chang , Sven L. M. Schroeder , Takahito Imai , Teruo Hashimoto , J. Frederick W. Mosselmans , Robert A. W. Dryfe

Journal Of The American Chemical Society 137 (48), 15135–15144

DOI: 10.1021/jacs.5b07825

PMID: 26559785

Diamond Proposal Number(s): [11293, 8861]