Inhibited and enhanced nucleation of gold nanoparticles at the water|1,2-dichloroethane interface
Inhibited and enhanced nucleation of gold nanoparticles at the water|1,2-dichloroethane interface
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DOI：
10.1039/c1cp21536a
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Dryfe, Robert A. W.
中科院分区：
文献类型：
--
作者：
Gruender, Yvonne;Ho, Huong L. T.;Dryfe, Robert A. W.
本文研究了在1，2-二氯乙烷中，以六氰合铁酸盐为还原剂，四氯金酸盐或四溴金酸盐还原金在不互溶电解质溶液界面上的沉积。在界面处不存在缺陷的清洁环境中，Au（III）络合物被还原成Au（I）络合物，但没有观察到固相形成。沉积过程只能通过在界面处添加钯纳米颗粒形式的人工成核位点来观察。通过测定金在1，2-二氯乙烷中的还原电位，可以将该过程与Au（I）卤化物络合物还原为金属金相联系起来。XANES测量表明，四氯金酸根离子完整地转移到有机相中，中心Au原子保持其+3的氧化态，并且整个阴离子保持带-1电荷。
The deposition of gold at the interface between immiscible electrolyte solutions has been investigated using reduction of tetrachloroaurate or tetrabromoaurate in 1,2-dichloroethane, with aqueous phase hexacyanoferrate as reducing agent. In a clean environment without defects present at the interface, the Au(III) complex was reduced to the Au(I) complex, but no solid phase formation could be observed. A deposition process could only be observed through the addition of artificial nucleation sites in the form of palladium nanoparticles at the interface. This process could be associated with the reduction of the Au(I) halide complex to metallic gold, by determining the gold reduction potentials in 1,2-dichloroethane. XANES measurements indicate that tetrachloroaurate ion transfers intact into the organic phase, with the central Au atom retaining its oxidation state of +3 and the overall anion remaining charged at -1.