Surface-initiated mechanism for the formation of relief gratings on azo-polymer films

被引:96
作者
Viswanathan, NK
Balasubramanian, S
Li, L
Kumar, J
Tripathy, SK [1 ]
机构
[1] Univ Massachusetts, Ctr Adv Mat, Dept Phys, Lowell, MA 01854 USA
[2] Univ Massachusetts, Dept Chem, Lowell, MA 01854 USA
关键词
D O I
10.1021/jp981425z
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report here a detailed experimental study, establishing the surface-initiated mechanism for the photoinduced relief grating formation on azobenzene functionalized polymer films. The grating formation process is found to be strongly dependent on the nature of the surface (20-200 Angstrom), while the birefringent grating appears to be a purely bulk process. Restriction of the surface of the azobenzene polymer film through the deposition of ultrathin top layers of transparent polyelectrolytes by electrostatic self-assembly dramatically decreases the relief grating formation. Thicker polyelectrolyte multilayer film (250 Angstrom) on the surface resulted in the formation of purely birefringent grating, without any surface features.
引用
收藏
页码:6064 / 6070
页数:7
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