van der Linden Marte, van Bunningen Arnoldus J, Amidani Lucia, Bransen Maarten, Elnaggar Hebatalla, Glatzel Pieter, Meijerink Andries, de Groot Frank M F
Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science , Utrecht University , Universiteitslaan 99 , 3584 CG Utrecht , The Netherlands.
European Synchrotron Radiation Facility , 71 Avenue des Martyrs, CS 40220 , 38043 Grenoble , France.
ACS Nano. 2018 Dec 26;12(12):12751-12760. doi: 10.1021/acsnano.8b07807. Epub 2018 Dec 3.
Ag nanoclusters capped with lipoic acid (LA) can be doped with Au. The doped clusters show enhanced stability and increased luminescence efficiency. We attribute the higher quantum yield to an increase in the rate of radiative decay. With mass spectrometry, the Au-doped clusters were found to consist predominantly of AuAg(LA). The clusters were characterized using X-ray absorption spectroscopy at the Au L-edge. Both the extended absorption fine structure (EXAFS) and the near edge structure (XANES) in combination with electronic structure calculations confirm that the Au dopant is preferentially located in the center of the cluster. A useful XANES spectrum can be recorded for lower concentrations, or in shorter time, than the more commonly used EXAFS. This makes XANES a valuable tool for structural characterization.
用硫辛酸（LA）包覆的银纳米团簇可以掺杂金。掺杂后的团簇显示出更高的稳定性和增强的发光效率。我们将更高的量子产率归因于辐射衰变率的增加。通过质谱分析，发现掺杂金的团簇主要由AuAg(LA)组成。利用金L边的X射线吸收光谱对团簇进行了表征。扩展X射线吸收精细结构（EXAFS）和近边结构（XANES）结合电子结构计算均证实，金掺杂剂优先位于团簇中心。与更常用的EXAFS相比，对于较低浓度或更短时间，可以记录到有用的XANES光谱。这使得XANES成为结构表征的一个有价值的工具。
