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Creation of CsAu nanoclusters by UV‐light irradiation on CsBr:Au – crystals
Author(s) -
Kawai Taketoshi,
Yamano Asuka
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541314
Subject(s) - irradiation , absorption (acoustics) , monomer , nanoclusters , ion , absorption spectroscopy , chemistry , halide , absorption band , ultraviolet , alkali metal , photochemistry , analytical chemistry (journal) , materials science , inorganic chemistry , optics , optoelectronics , physics , organic chemistry , nuclear physics , composite material , polymer , chromatography
We have investigated the optical absorption spectra of the CsBr:Au – crystals irradiated with an ultraviolet (UV) light. Before the UV‐light irradiation, the absorption bands associated with the isolated Au – ion (monomer) are observed in the energy region of UV. After a slight UV‐light irradiation, the absorption intensities of the monomer bands decrease and the absorption bands due to paired Au – ions appear around the monomer bands. Furthermore, UV‐light irradiation on the CsBr:Au – crystals brings about the appearance of several new absorption bands in the visible region. From the analogy with the aggregation of the F centers in alkali halide crystals, the new absorption bands are attributed to the aggregate centers of the Au – ions. They can also be regarded as the CsAu nanocluster constructed from the Cs + cations and the Au – anions. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)