期刊
LANGMUIR
卷 30, 期 29, 页码 8856-8865出版社
AMER CHEMICAL SOC
DOI: 10.1021/la501930e
关键词
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资金
- National Science Foundation
- NSF-DMR [1002810]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-09ER46604]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1002810] Funding Source: National Science Foundation
We synthesized a series of hybrid nanomaterials combining organic dyes with polyhedral oligomeric silses-quioxanes (POSS) based on three different azobenzenes: monoazobenzene (4-phenylazophenol), bis-azobenzene (Disperse Yellow 7 and Fast Garnet derivative), and push pull azobenzene (Disperse Red 1) via hydrosilylation coupling. The azo-functionalized POSS compounds possess high thermal stability, and their branched architecture resulted in effective suppression of molecular aggregation and allowed for direct imaging of individual dye-POSS structures with expected molecular dimensions. Stable, uniform, smooth, and ultrathin nanocomposite films with mixed silica organic composition and relatively low refractive indices can be fabricated from all azo-POSS branched conjugates. Finally, the photoisomerization behavior of POSS-conjugated 4-phenylazophenol was investigated in solution as well as in ultrathin nanocomposite film. We found that conjugation to POSS core did not affect the kinetics of trans-cis photoisomerization and thermal cis-trans relaxation. Furthermore, rapid and reversible photoisomerization was observed in azo-POSS nanocomposite films. We suggest that the highly stable branched azo-POSS conjugates with high dye grafting density described here can be considered for nanometersized photoswitches, active layer material with optical-limiting properties, and a medium with photoinduced anisotropy for optical storage.
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