Web Release Date: June 12,
Electronic Structure of Cobalt Nanocrystals Suspended in Liquid
#
and
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden, Department of Physics, Tamkang University, Tamsui, Taiwan 251, R.O.C., Department of Chemistry, University of California, Berkeley, California 94720, London Centre for Nanotechnology, Chemistry Department, University College London WC1H 0AJ, United Kingdom, Departamento de Física, FCE, UNLP-INIFTA (CONICET), Argentina, Department of Chemistry, Utrecht University, The Netherlands
Received March 13, 2007
Revised May 24, 2007
Abstract:
The electronic structure of cobalt nanocrystals suspended in liquid as a function of size has been investigated using in situ X-ray absorption
and emission spectroscopy. A sharp absorption peak associated with the ligand molecules is found that increases in intensity upon reducing
the nanocrystal size. X-ray Raman features due to d-d and to charge-transfer excitations of ligand molecules are identified. The study reveals
the local symmetry of the surface of 
-Co phase nanocrystals, which originates from a dynamic interaction between Co nanocrystals and
surfactant + solvent molecules.
Download the full text: PDF | HTML
