Electrochromic properties of one-dimensional tungsten oxide nanobundles

Abstract In this study, one-dimensional (1D) tungsten oxide nanobundles (TNB) were synthesized via a simple solvothermal method. The phase of 1D tungsten oxide was W 18 O 49 , and the diameter and length of the building units (nanowires) were about 7 and 800 nm, respectively. TNB films were fabricated by the Langmuir–Blodgett (LB) method. The locally arranged domains of the long nanobundles form the LB films, but it is difficult for them to align perfectly owing to the inter-nanobundle interaction and dispersion problems. The electrochromic (EC) property of the TNB LB films was characterized by electrochemical potential cycling tests and in situ transmittance measurement. The deposition condition of the LB films influenced their EC property. The heat treatment and surface pressure of the TNB LB films plays an important role in the response time and transmittance of the TNBs.

[1]  C. Lampert.  Towards large-area photovoltaic nanocells: experiences learned from smart window technology , 1994 .

[2]  Jiangtao Hu,et al.  Chemistry and Physics in One Dimension: Synthesis and Properties of Nanowires and Nanotubes , 1999 .

[3]  Joshua E. Goldberger,et al.  SEMICONDUCTOR NANOWIRES AND NANOTUBES , 2004 .

[4]  Reinhard Nesper,et al.  Oxidic nanotubes and nanorods--anisotropic modules for a future nanotechnology. , 2002, Angewandte Chemie.

[5]  Andrew G. Glen,et al.  APPL , 2001 .

[6]  Jie Liu,et al.  Tungsten Oxide Nanowires on Tungsten Substrates , 2002 .

[7]  T. Yamase,et al.  Photo- and Electrochromism of Polyoxometalates and Related Materials. , 1998, Chemical reviews.

[8]  Dmitri Golberg,et al.  Quasi‐Aligned Single‐Crystalline W18O49 Nanotubes and Nanowires , 2003 .

[9]  Younan Xia,et al.  One‐Dimensional Nanostructures: Synthesis, Characterization, and Applications , 2003 .

[10]  C. E. Tracy,et al.  Electrochromic coloration efficiency of a-WO3−y thin films as a function of oxygen deficiency , 1999 .

[11]  S. K. Deb.  Optical and photoelectric properties and colour centres in thin films of tungsten oxide , 1973 .

[12]  Dongmok Whang,et al.  Large-scale hierarchical organization of nanowire arrays for integrated nanosystems , 2003 .

[13]  Claes G. Granqvist,et al.  Handbook of inorganic electrochromic materials , 1995 .

[14]  Do Kyung Kim,et al.  Solvothermal Synthesis of Tungsten Oxide Nanorod/Nanowire/Nanosheet , 2005 .

[15]  R. Ma,et al.  Simple Approaches to Quality Large-Scale Tungsten Oxide Nanoneedles , 2004 .

[16]  Younan Xia,et al.  Langmuir-Blodgett Silver Nanowire Monolayers for Molecular Sensing Using Surface-Enhanced Raman Spectroscopy , 2003 .

[17]  C. Wang,et al.  A Simple Method for the Synthesis of Highly Oriented Potassium‐Doped Tungsten Oxide Nanowires , 2003 .

[18]  P. Yang,et al.  Langmuir-Blodgett nanorod assembly. , 2001, Journal of the American Chemical Society.