Surface adsorption effects on the lattice expansion of copper nanocrystals

Champion, Yannick; Bernard, Frédéric; Millot, Nadine; Perriat, Pascal
June 2005
Applied Physics Letters;6/6/2005, Vol. 86 Issue 23, p231914
Academic Journal
Lattice expansion in nanocrystalline copper due to size and surface effect is reported. The lattice parameter is measured by in situ x-ray diffraction at various temperatures from -173 °C to 150 °C. The experiments are carried out on nanocrystalline copper powders having an average particle size of 40 nm. The size effect on the lattice expansion is examined regarding a modified Laplace law, where a surface stress is considered instead of the usual scalar surface energy. The results are discussed taking into account oxidation state and the sorption of molecular species at the nanoparticles surface.


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