The Formation of Copper Nanoclusters in SiO2: An X-ray Absorption Study
RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
Pagination or Media Count:
Results on Cu K-edge x-ray absorption study of copper dispersed in SiO2 are reported. Randomly distributed in as-made samples at low concentration, copper atoms tends to form clusters at larger concentrations. The cluster size reaches a size of 20 to 50 A after which the cluster growth stops. Only the first-neighbour peak is observed in as-made samples indicating either a very strong disorder in clusters or their low-dimensionality. Annealing results in the formation of copper clusters of the same size with fcc structure.