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	Sequentially adsorbed electrostatic multilayers of polyaniline and azo polyelectrolytes
	Haoyu Zhang ; Xuejia Yan ; Yanwei Wang ; Yonghong Deng ; Xiaogong Wang
	2010-10-12 ; 2010-10-12
关键词	Bibliography Experimental/ adsorption dichroism electrochromism ellipsometry optical multilayers optical polymers pH photochemistry polymer electrolytes polymer films self-assembly ultraviolet spectra visible spectra/ sequentially adsorbed electrostatic multilayers polyaniline azo polyelectrolytes multilayer films electrostatic layer-by-layer self-assembly electrostatic adsorption process polycation polyanion multilayer growth UV-vis spectroscopy optical ellipsometry photoresponsive property electrochromic property pH dipping solutions photoinduced dichroic property surface-relief-grating argon-laser irradiation azo chromophores transparent yellow-green film deep green-to-opaque black film electrochemical transitions electroactive components optics applications photonic devices/ A6855 Thin film growth, structure, and epitaxy A7865T Optical properties of organic compounds and polymers (thin films/low-dimensional structures) A8245 Electrochemistry and electrophoresis A4270J Optical polymers and other organic optical materials A8265M Sorption and accommodation coefficients (surface chemistry) A8116D Self-assembly in nanofabrication A7840H Visible and ultraviolet spectra of other nonmetals A7820J Electro-optical effects (condensed matter) A7820F Birefringence (condensed matter) A8250F Photolysis and photodissociation by IR, UV and visible radiation
中文摘要	In this study, multilayer films composed of alternate polyaniline (PANI) and azo-polyelectrolyte (PNACN, PPAPE, PNANT or PNATZ) layers were fabricated through the electrostatic layer-by-layer self-assembly scheme. In the electrostatic adsorption process, PANI was used as the polycation and the azo polyelectrolytes were used as the polyanion. The multilayer growth was monitored by UV-vis spectroscopy and optical ellipsometry. The photoresponsive and electrochromic properties of the multilayer films were studied by UV-vis spectroscopy and electrochemical measurement. Results show that the multilayer films exhibit linear increases in both the absorbance and film thickness with the increase of the deposition cycles. The thickness contributed by each individual layer depends on the pH of the PANI and azo-polyelectrolyte dipping solutions. The multilayer films can show photoinduced dichroic properties contributed by the azo-polyelectrolyte layers, but the ability to form surface-relief-grating (SRG) upon Ar+ laser irradiation is relatively weak. The multilayer films possess the characteristic absorption bands related to the azo chromophores and PANI. As the location of the PANI bands depends on its oxidation states, the multilayer films can show sensitive electrochromic variation. For instance, the PANI/PNACN multilayer films can undergo a transition from transparent yellow-green through deep green to opaque black when the potential changes from -0.1 to 0.8 V. It is demonstrated that using the azo polyelectrolytes with different hues, enriched spectrum of the colors can be obtained by the electrochemical transitions. The multilayer films containing both photoresponsive and electroactive components can be expected for applications in optics, photonic devices and others.[All rights reserved Elsevier].
语种	英语
出版者	Elsevier Science Ltd. ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79490]
专题	清华大学
推荐引用方式 GB/T 7714	Haoyu Zhang,Xuejia Yan,Yanwei Wang,et al. Sequentially adsorbed electrostatic multilayers of polyaniline and azo polyelectrolytes[J],2010, 2010.
APA	Haoyu Zhang,Xuejia Yan,Yanwei Wang,Yonghong Deng,&Xiaogong Wang.(2010).Sequentially adsorbed electrostatic multilayers of polyaniline and azo polyelectrolytes..
MLA	Haoyu Zhang,et al."Sequentially adsorbed electrostatic multilayers of polyaniline and azo polyelectrolytes".(2010).

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