Azobenzene Supramolecular Side-Chain Polymer Films for Laser-Induced Surface Relief Gratings.pdf
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Azobenzene Supramolecular Side-Chain Polymer Films for Laser-Induced Surface Relief Gratings
Azobenzene-Containing Supramolecular Side-Chain Polymer Films
for Laser-Induced Surface Relief Gratings
Jian Gao,
?
Yaning He,
?
Fang Liu,
?
Xi Zhang,*
,?
Zhiqiang Wang,
?
and Xiaogong Wang
?
Key Lab of Organic Optoelectronics Molecular Engineering, Department of Chemistry, Tsinghua
UniVersity, Beijing 100084, P. R. China, and Laboratory for AdVanced Materials, Department of Chemical
Engineering, Tsinghua UniVersity, Beijing 100084, P. R. China
ReceiVed March 15, 2007. ReVised Manuscript ReceiVed June 4, 2007
In this article, we describe the fabrication of azobenzene-containing supramolecular side-chain polymer
films based on hydrogen bonds, on which surface relief gratings can be laser-induced. The supramolecular
polymer side-chain is formed by attaching different azobenzene-type compounds to poly(4-vinylpyridine)
through hydrogen bonding, thus allowing for tuning the content and kind of the azobenzene derivatives
easily and avoiding the tedious synthetic work. It is found that such an azobenzene-containing
supramolecular side-chain polymer can form nice films by the spin-coating method for surface relief
gratings, and moreover, a large surface modulation depth of 312 nm can be observed. We anticipate that
this research provides a type of materials for surface relief gratings. In closing, we have provided a new
approach for fabricating surface relief gratings employing hydrogen-bonded supramolecular side-chain
azo polymers.
Introduction
Azobenzene-containing polymers are fascinating materials
because of efficient photoisomerization and photoinduced
anisotropy of the azobenzene groups. The incorporation of
azo chromophores into the polymers based on covalent bonds
or noncovalent bonds can introduce structural diversity and
processible ability into the functional materials. Laser-
induced surface relief gratings (SRGs) on azobenzene
polymer films, first reported by Natansohn et al. and Tripathy
et al. in 1995,
1
has aroused considerable attention since then.
2
The l
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