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	Construction of azo polyelectrolyte self-assembled multilayers by dipping and spin-coating
	Li Xinyang ; He Yaning ; Wang Yanwei ; Tuo Xinlin ; Wang Xiaogong
	2010-05-07 ; 2010-05-07
关键词	dipping spin-coating azo-containing polyelectrolyte surface relief gratings SURFACE-RELIEF GRATINGS PHOTORESPONSIVE BEHAVIOR CONTAINING POLYMERS FILMS AZOBENZENE FABRICATION Polymer Science
中文摘要	A series of different methods have been used to fabricate the polyelectrolyte multilayer films through the layer-by-layerd adsorption self-assembly method based on electrostatic attraction. In this presentation the multilayer building-up methods through dipping and spin-coating were used to study the influence of the multilayer building-up methods on the multilayers' structure and properties. Experimentally, azobenzene-containing polyelectrolyte PNACN was fabricated into multilayers with counterpart polyelectrolyte PDAC using the layer-by-layer technique based on dipping and spin-coating, respectively. The differences in growth mechanism, structure and photo-sensitive properties of the multilayers fabricated with the two different methods were studied using UV-Vis, ellipsometer and AFM for characterization. Experimental results show that both of the dipping and spin-coating methods could fabricate uniformly layer-by-layered growth multilayer films while the multilayers fabricated by dipping grew faster than those fabricated by spin-coating. Both of the multilayers have relatively smooth surfaces with some spherical structure on them, which is believed to be due to the aggregation of hydrophobic azobenzene chromophores. Interestingly, these two kinds of multiplayers have obviously different and complicated responses to the photo irradiation. Under irradiation with interference polarized laser beams, the multilayers by spin-coating could be written with surface relief gratings (SRGs) while not for those by dipping in case that both of the multilayers were less than 100 nm thick approximately. When the multilayers became thicker (for example more than 200 nm) both of the multilayers could be written with obvious SRGs, and the SRGs on the dipping multilayer surface were deeper for its thicker total multilayers. The difference of the multilayers in optical properties is believed to have closed relationship with their difference in multilayer structures. Generally, the polymer chains in the multilayers fabricated through dipping are strongly interpenetrated among the ambient layers so that the combination of the interpenetration and electrostatic attraction between the opposite charged polyelectrolytes leads to a cross linkage-like multilayer structure. On the other hand, the interpenetration of the polymer chains in the multilayers fabricated through spin-coating are more free and mobile. As a result, when the multilayer is relatively thin (less than about 100 nm) the SRGs structure can be formed on the spin-coating multilayers surface.
语种	中文 ; 中文
出版者	SCIENCE CHINA PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/17566]
专题	清华大学
推荐引用方式 GB/T 7714	Li Xinyang,He Yaning,Wang Yanwei,et al. Construction of azo polyelectrolyte self-assembled multilayers by dipping and spin-coating[J],2010, 2010.
APA	Li Xinyang,He Yaning,Wang Yanwei,Tuo Xinlin,&Wang Xiaogong.(2010).Construction of azo polyelectrolyte self-assembled multilayers by dipping and spin-coating..
MLA	Li Xinyang,et al."Construction of azo polyelectrolyte self-assembled multilayers by dipping and spin-coating".(2010).

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