Open AccessXAFS studies of gold and silver–gold nanoparticles in aqueous solutions
Author(s) -
Shibata Tomohiro,
Tostmann Holger,
Bunker Bruce,
Henglein Arnim,
Meisel Dan,
Cheong Seongkyun,
Boyanov Maxim
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500017167
Subject(s) - x ray absorption fine structure , colloidal gold , aqueous solution , nanoparticle , materials science , colloid , absorption (acoustics) , deposition (geology) , nanotechnology , chemical engineering , chemistry , spectroscopy , composite material , paleontology , physics , quantum mechanics , sediment , biology , engineering
The X‐ray absorption fine structure (XAFS) of colloidal Au and Au/Ag nanoparticles (3.5 nm and 20 nm mean diameter) in an aqueous solution has been investigated. Size dependent alloying was observed upon deposition of Ag on Au core. Ag forms distinct layers around the 20 nm Au nanoparticles. In contrast, random mixing is found for Ag deposited on 3.5 nm Au particles.