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On the Structure of Gold-Silver Nanoparticles

DOI: 10.1021/acs.jpcc.6b11186 DOI Help

Authors: Ian J. Godfrey (University College London (UCL); Japan Advanced Institute of Science and Technology) , Andrew J. Dent (Diamond Light Source Ltd) , Ivan P. Parkin (University College London) , Shinya Maenosono (Japan Advanced Institute of Science and Technology) , Gopinathan Sankar (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: January 2017
Diamond Proposal Number(s): 9949

Abstract: Nanoparticles with nominal structures of Au@Ag (core@shell) and Au@Ag@Au (core@shell@shell) were prepared using the sequential citrate reduction technique and characterized using the routine characterization techniques, including transmission electron microscopy. X-ray absorption spectroscopy was then carried out on the samples, and extended X-ray absorption fine structure (EXAFS) analysis was used to determine the structure of the systems. The results of the routine techniques and the X-ray absorption spectroscopy were then compared. EXAFS analysis of the nanoparticles with Au@Ag structure revealed very limited bimetallic interactions, supporting the assignment of a core@shell structure. EXAFS analysis of the nanoparticles with Au@Ag@Au structure showed an increased proportion of bimetallic interactions. Based on the colloid composition, the other characterization techniques and the chemistry of the system, these nanoparticles interpreted as having an Au@Au/Ag-alloy structure. The EXAFS analyses corroborated the other characterization techniques and enabled the determination of the average-structure of the entire sample.

Subject Areas: Chemistry, Physics

Instruments: B18-Core EXAFS

Other Facilities: European Synchrotron Radiation Facility