A surface phase transition of supported gold nanoparticles.
A thermal phase transition has been resolved in gold nanoparticles supported on a surface. By use of asynchronous optical sampling with coupled femtosecond oscillators, the Lamb vibrational modes could be resolved as a function of annealing temperature. At a temperature of 104 degrees C the damping rate and phase changes abruptly, indicating a structural transition in the particle, which is explained as the onset of surface melting.
Plech
Anton
A
Department of Physics and Center for Applied Photonics, University of Konstanz, Universitätsstrasse 10, D-78457 Konstanz, Germany. anton.plech@uni-konstanz.de
Cerna
Roland
R
Kotaidis
Vassilios
V
Hudert
Florian
F
Bartels
Albrecht
A
Dekorsy
Thomas
T
D003460:Crystallization / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D044367:Phase Transition; D013499:Surface Properties; D044366:Transition Temperature
D046911:Macromolecular Substances; D006046:Gold