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Multicolor Photochromism of Polymolybdate‐Citric Acid Composite Films
Author(s) -
Jing Wang,
GuangJin Zhang,
WenSheng Yang,
JianNian Yao
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200591037
Subject(s) - photochromism , chemistry , citric acid , irradiation , photochemistry , composite number , raman spectroscopy , scavenger , visible spectrum , nuclear chemistry , radical , optics , organic chemistry , composite material , optoelectronics , materials science , physics , nuclear physics
Photochromic polymolybdate‐citric acid composite films were fabricated. It was found that after UV irradiation the composite films with different molar ratios of organic/inorganic components exhibited different colors. The UV‐irradiated films showed dark blue, dark khaki and light sea green colors when the ratios were 1.0, 0.3 and 0.2, respectively. It was identified by Raman spectra that the polymolybdate species formed in the composite films after UV irradiation were sensitive to the ratios of the organic/inorganic components, thus resulting in the different colors of irradiated films. Citric acid played an important role during the photochromic process. Under UV light irradiation, it served as hole scavenger that suppresses the recombination of photogenerated electrons and holes to make the polymolybdates show UV light photochromism.