Ruan, Chong-Yu and Murooka, Yoshie and Raman, Ramani K. and Murdick, Ryan A. (2007) Dynamics of size-selected gold nanoparticles studied by ultrafast electron nanocrystallography. NANO LETTERS, 7 (5). pp. 1290-1296.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl070269h
We report the studies of ultrafast electron nanocrystallography on size-selected Au nanoparticles (2−20 nm) supported on a molecular interface. Reversible surface melting, melting, and recrystallization were investigated with dynamical full-profile radial distribution functions determined with subpicosecond and picometer accuracies. In an ultrafast photoinduced melting, the nanoparticles are driven to a nonequilibrium transformation, characterized by the initial lattice deformations, nonequilibrium electron−phonon coupling, and, upon melting, the collective bonding and debonding, transforming nanocrystals into shelled nanoliquids. The displasive structural excitation at premelting and the coherent transformation with crystal/liquid coexistence during photomelting differ from the reciprocal behavior of recrystallization, where a hot lattice forms from liquid and then thermally contracts. The degree of structural change and the thermodynamics of melting are found to depend on the size of nanoparticle.
|Subjects:||Physical Science > Nano objects|
Material Science > Nanostructured materials
Material Science > Nanochemistry
|Deposited By:||Anuj Seth|
|Deposited On:||27 May 2009 14:17|
|Last Modified:||27 May 2009 14:17|
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