Electrochromic properties of asymmetric 4,4′-bipyridinium nanocomposites with inorganic nanoparticles

Yuna Kim, Si Young Yang, Eunkyoung Kim

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9 Citations (Scopus)


Asymmetric mono cationic 4,4′-bipyridiniums, 1 -butyl-4,4′- bipyridinium bromide (BUBP) and 1-methyl-4,4′-bipyridinium iodide (MEBP) showed electrochromic properties from blue to transparent yellow. The electrochromic bipyridiniums, BUBP and MEBP, were introduced to solid state electrochromic cells by using a solution of the bipyridinium, TiO 2, and polymer electrolyte composite. The 4,4′-bipyridinium derivatives was attached to TiO 2 nanoparticles and decreased aggregation of TiO 2 to afford EC dye-TiO 2 nanoparticles with average diameter smaller than 20 nm, as determined by FE-SEM. An all solid state electrochromic cells prepared from the dye-TiO 2 nanoparticles showed improved electrochromic response compared to that without TiO 2. Thus the cell from the BUBP- TiO 2 nanoparticles responded to a step potential of ±2 V within 7 sec with coloration efficiency of 117. The redox cyclability of the bipyridinium-TiO 2 nanoparticles cell was longer than that of the TiO 2 free cells. The enhanced properties were attributed to the conductivity and the large surface area of TiO 2 nanoparticles.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Issue number1
Publication statusPublished - 2010 Jan

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • Biomedical Engineering
  • General Materials Science
  • Condensed Matter Physics


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