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• W2023576892 startingPage "6755" @default.
• W2023576892 abstract "In this work, formation of photoinduced self-structured surface pattern and its correlation with chromophoric structures were studied by using a series of star-shaped azo compounds, which exist as stable molecular glass at room temperature. For the synthesis, a star-shaped precursor (Tr-AN) was prepared by a ring-open reaction between 1, 3, 5-triglycidyl isocyanurate and N-methylaniline. The star-shaped azo compounds were then synthesized through azo-coupling reactions between the precursor and diazonium salts of 4-nitroaniline, 2-methyl-4-nitroaniline, and 4-aminobenzonitrile, respectively. Through these steps, three azo compounds were obtained to bear different donor−acceptor type azo chromophores at the peripheral positions. The formation of the photoinduced self-structured patterns was investigated by irradiating solid thin films of the molecular azo glass with a uniform laser beam (532 nm, 200 mW/cm2) at normal incidence. For comparison, formation of surface-relief-gratings (SRGs) was also investigated by exposing the thin films to an interference pattern of the laser beams (532 nm, 80 mW/cm2). The results show that SRGs can be inscribed on the films of all three star-shaped azo compounds, but self-structured surface patterns is only observed on film of the azo compound containing 4-cyanoazobenzene moieties (Tr−AZ−CN) under the same irradiation condition. The electron-withdrawing groups, which control the absorption band position, show a significant influence on both the self-structured pattern formation and SRG inscription rate. Under proper experimental conditions, both self-structured surface pattern and SRG can simultaneously be observed on the Tr−AZ−CN films. The observations can lead to a deeper understanding of the photoinduced effects, especially their correlation with molecular structures." @default.
• W2023576892 created "2016-06-24" @default.
• W2023576892 creator A5023305472 @default.
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• W2023576892 date "2009-12-11" @default.
• W2023576892 modified "2023-09-23" @default.
• W2023576892 title "Self-Structured Surface Patterns on Molecular Azo Glass Films Induced by Laser Light Irradiation" @default.
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• W2023576892 doi "https://doi.org/10.1021/la9041056" @default.
• W2023576892 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20000616" @default.
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