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Self-structured surface patterns on molecular azo glass films induced by laser light irradiation
Jianjun Yin1, Gang Ye, Xiaogong Wang
1Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing, PR China, 100084.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 17, 2009
Summary
Photoinduced self-structured patterns form on star-shaped azo compounds, with specific molecular structures enhancing pattern formation and grating inscription rates. This reveals key correlations between molecular design and light-induced surface modifications.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Star-shaped azo compounds are stable molecular glasses at room temperature.
- Photoinduced surface pattern formation is a key phenomenon in materials science.
- Understanding the correlation between molecular structure and photoresponsive behavior is crucial.
Purpose of the Study:
- To investigate the formation of photoinduced self-structured surface patterns in star-shaped azo compounds.
- To correlate the observed patterns with the chromophoric structures of the synthesized azo compounds.
- To compare self-structured pattern formation with surface-relief-grating (SRG) inscription.
Main Methods:
- Synthesis of star-shaped azo compounds via ring-opening and azo-coupling reactions.
- Preparation of solid thin films from molecular azo glass.
- Irradiation of films with uniform laser beams (532 nm) for self-patterning and interference patterns for SRGs.
Main Results:
- Surface-relief-gratings (SRGs) were inscribed on all three synthesized star-shaped azo compounds.
- Photoinduced self-structured surface patterns were exclusively observed on the compound with 4-cyanoazobenzene moieties (Tr-AZ-CN).
- Electron-withdrawing groups significantly influenced both self-patterning and SRG inscription rates.
Conclusions:
- The molecular structure, particularly the presence of electron-withdrawing groups, dictates the formation of photoinduced self-structured patterns.
- Both self-structured patterns and SRGs can be simultaneously formed on Tr-AZ-CN films under specific conditions.
- This study provides insights into photoinduced effects and their relationship with molecular architecture in azo materials.
