Electronic Structure of Cobalt Nanocrystals Suspended in Liquid

LIU, H; GUO, J.-H; YIN, Y; AUGUSTSSON, A; DONG, C.; NORDGREN, J.; CHANG, C.; ALIVISATOS, P.; THORNTON, G.; OGLETREE, D. F.; REQUEJO, F. G.; DE GROOT, F.; SALMERON, M.

NANO LETTERS (PRINT)

Año: 2007 vol. 7 p. 1919 - 1922

1530-6984

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 reducingthe 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 E-Co phase nanocrystals, which originates from a dynamic interaction between Co nanocrystals and surfactant + solvent molecules.