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Following the formation of silver nanoparticles using in situ x-ray absorption spectroscopy

DOI: 10.1021/acsomega.0c00697 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 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: Acs Omega

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 9949

Open Access Open Access

Abstract: The formation of silver and Au@Ag core@shell nanoparticles via reduction of AgNO3 by trisodium citrate was followed using in situ X-ray absorption near-edge structure (XANES) spectroscopy and time-resolved UV–visible (UV–vis) spectroscopy. The XANES data were analyzed through linear combination fitting, and the reaction kinetics were found to be consistent with first-order behavior with respect to silver cations. For the Au@Ag nanoparticles, the UV–vis data of a lab-scale reaction showed a gradual shift in dominance between the gold- and silver-localized surface plasmon absorbance bands. Notably, throughout much of the reaction, distinct gold and silver contributions to the UV–vis spectra were observed; however, in the final product, the contributions were not distinct.

Subject Areas: Chemistry


Instruments: B18-Core EXAFS

Documents:
acsomega.0c00697.pdf