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Enhanced photochromic efficiency of transparent and flexible nanocomposite films based on PEO-PPO-PEO and tungstate hybridization
Wang C.; Zhou B.P.; Zeng X.P.; Hong Y.Y.; Gao Y.B.; Wen W.J.
2015-01-07
Source PublicationJournal of Materials Chemistry C
ISSN2050-7526
Volume3Issue:1Pages:177-186
Abstract

Nanocomposite hybrid films were prepared by depositing tungstate on PEO-PPO-PEO (EPE) templates under acidic conditions by a one-pot self-assembly sol-gel method. Uniform and transparent films based on this precursor were fabricated and easily manipulated using a facile casting method. Upon irradiation by sunlight, the film exhibits a rapid photochromic response that was reversible at room temperature. UV-Vis analysis revealed that folding of the -CH-O- chains in the polymer and the larger tungstate clusters increased the red shift for the adsorption of visible light. The mechanism underlying the effect of hybridization of polyethylene oxide (PEO) on the enhanced photochromic effect was characterized by NMR, Raman and FTIR. The degree of folding of the -CH-O- polymer chains was influenced by the presence of acid, which increased the oxygen coordination of WO and WO in the tungstate clusters. The characterized W-O bonding peaks shifted upon EPE incorporation, consistent with changes in oxygen coordination within the material. This weak coordination between tungstate and -CH-O- improved the intervalence charge transfer (IVCT). Oxygen from EPE may enter the oxygen sites in the O-W-O clusters to produce an unbalanced electron state, resulting in oxygen defects, which has a critical effect on the enhancement of the photochromic response. In addition, this method provides protons via this weak coordination, thereby dramatically enhancing the efficiency of the hybrid film. This journal is

DOI10.1039/c4tc01987c
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000345920500026
Scopus ID2-s2.0-84915811261
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Citation statistics
Document TypeJournal article
CollectionUniversity of Macau
AffiliationHong Kong University of Science and Technology
Recommended Citation
GB/T 7714
Wang C.,Zhou B.P.,Zeng X.P.,et al. Enhanced photochromic efficiency of transparent and flexible nanocomposite films based on PEO-PPO-PEO and tungstate hybridization[J]. Journal of Materials Chemistry C, 2015, 3(1), 177-186.
APA Wang C.., Zhou B.P.., Zeng X.P.., Hong Y.Y.., Gao Y.B.., & Wen W.J. (2015). Enhanced photochromic efficiency of transparent and flexible nanocomposite films based on PEO-PPO-PEO and tungstate hybridization. Journal of Materials Chemistry C, 3(1), 177-186.
MLA Wang C.,et al."Enhanced photochromic efficiency of transparent and flexible nanocomposite films based on PEO-PPO-PEO and tungstate hybridization".Journal of Materials Chemistry C 3.1(2015):177-186.
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