Time-dependent electrochromism of nanocrystalline TiO2 films in propylene carbonate solution of LiClO4

Tae Sik Kang, Donghwan Kim, Kang Jin Kim

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Electrochromism of nanocrystalline TiO2 films under cathodic bias in propylene carbonate containing LiClO4 was studied by time-dependent absorption and fluorescence spectroscopies. The absorption spectra revealed two absorption bands near 700 and 420 nm. The absorption band near 700 nm showed a blue shift and an increase in absorbance with time. The blue shift seemed to be due to the progressive involvement of the trapped electrons in the lower energy levels within the shallow surface states. The newly observed band near 420 nm appeared to have originated from the deep surface states which, lying 1.3-1.8 eV below the conduction band, were gradually filled with electrons in the shallow surface states.

Original languageEnglish
Pages (from-to)1982-1986
Number of pages5
JournalJournal of the Electrochemical Society
Volume145
Issue number6
Publication statusPublished - 1998 Jun 1

Fingerprint

Electrochromism
electrochromism
Surface states
propylene
Propylene
Absorption spectra
Carbonates
carbonates
absorption spectra
blue shift
Electrons
Fluorescence spectroscopy
Conduction bands
Absorption spectroscopy
Electron energy levels
absorption spectroscopy
conduction bands
electrons
energy levels
fluorescence

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Time-dependent electrochromism of nanocrystalline TiO2 films in propylene carbonate solution of LiClO4 . / Kang, Tae Sik; Kim, Donghwan; Kim, Kang Jin.

In: Journal of the Electrochemical Society, Vol. 145, No. 6, 01.06.1998, p. 1982-1986.

Research output: Contribution to journalArticle

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