285832 Electrochromic Nanocomposite Films From Poly(DNTD) Via Electorpolymerization

Thursday, November 1, 2012: 2:20 PM
Fayette (Westin )
Huige Wei1,2, Xingru Yan3, Yunfeng Li2, Shijie Wu4, Andrew Wang5, Keqiang Ding6, Yun Tian2, Suying Wei7 and Zhanhu Guo2, (1)Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX, (2)Integrated Composites Laboratory (ICL), Dan F Smith Department of Chemical Engineering, Lamar University, Beaumont, TX, (3)Dan F. Smith Department of Chemical Engineering, Lamar University, BEAUMONT, TX, (4)Agilent Technologies, Inc, Chandler, Chandler, AZ, (5)Ocean NanoTech, LLC, Springdale, AR, (6)College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, China, (7)Chemistry and Biochemistry, Lamar University, Beaumont, TX

Hybrid electrochromic poly(DNTD) CdSe@ZnS quantum dots (QDs) and poly(DNTD)/ WO3 nanocomposite films were prepared by electropolymerization on an indium in oxide (ITO) coated glass slide from the DNTD monomer and nanoparticles suspended methylene chloride solution, respectively. The morphology and microstructure of the nanocomposite film were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM image shows that the QDs and WO3 nanoparticles are uniformly embedded in the polymeric matrix. The nanocomposite film also displays smooth topography with evenly-sized and uniformly distributed nanoparticles under high resolution AFM observations. Fluorescent microscopic observations revealed the fluorescent emission of the nanocomposites with the QDs embedded in the hosting polymer matrix. An air-stable electrochromical window was assembled and obtained by a home-made electrochemical cell to study the electrochromism and stableness of the nanocomposite film. For poly(DNTD)/ WO3 nanocomposite film, the film exhibits multiple colors at both the cathodic and anodic potentials, i.e. light blue at -1.4 V, orange red at -0.8 V, colorless at 0 V, orange green at 0.8 V, light blue at 1.0 V, and deep blue at 1.2 or 1.4 V vs. Ag/AgCl in propylene carbonate containing 1.0 M LiClO4 electrolyte. The UV-Visible incorporated electrochemical spectroscopy coupled with amperometry were also employed to study the composite film under different potentials in the range of -1.4 to 1.4 V vs. Ag/AgCl. The composite film also shows stable electrochromism even after 100 times scan. The unique electrochromic properties of these hybrid nanocomposite thin films promise potential applications of nanocomposite thin films from poly(DNTD) in the electrochromic divices.

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