Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations

Y. Domori, Tokuro Nanba, Y. Miura, Shinichi Sakida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

It was confirmed that the divalent cations, Zn2+ and Cu 2+ were electrochemically inserted into amorphous WO3 films prepared by r.f.-magnetron sputtering method. Coloration of the films was also observed, and the films were, however, bleached gradually. The bleaching mechanism was discussed based on the ab-initio molecular orbital calculations, in which Li+ or Zn2+ ions were introduced into the WO 3 frameworks. In the case of Zn insertion, electrons were trapped in a non-bonding Zn 4s orbital just below the conduction band. It was finally concluded that in the films with distorted WO3 frameworks, Zn 4s orbital was mingled in the conduction band and electrons were free to be transferred between W6+ and W5+. As the structural relaxation progressed, electrons were gradually trapped in Zn 4s orbital, and the films were finally bleached.

Original languageEnglish
Title of host publicationCeramic Transactions
Pages491-496
Number of pages6
Volume196
Publication statusPublished - 2006
Event6th Pacific Rim Conference on Ceramic and Glass Technology - Maui, Hawaii, United States
Duration: Sep 11 2005Sep 16 2005

Publication series

NameCeramic Transactions
Volume196
ISSN (Print)10421122

Other

Other6th Pacific Rim Conference on Ceramic and Glass Technology
CountryUnited States
CityMaui, Hawaii
Period9/11/059/16/05

Fingerprint

Divalent Cations
Amorphous films
Bleaching
Positive ions
Conduction bands
Electrons
Orbital calculations
Structural relaxation
Molecular orbitals
Magnetron sputtering
Ions

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Domori, Y., Nanba, T., Miura, Y., & Sakida, S. (2006). Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations. In Ceramic Transactions (Vol. 196, pp. 491-496). (Ceramic Transactions; Vol. 196).

Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations. / Domori, Y.; Nanba, Tokuro; Miura, Y.; Sakida, Shinichi.

Ceramic Transactions. Vol. 196 2006. p. 491-496 (Ceramic Transactions; Vol. 196).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Domori, Y, Nanba, T, Miura, Y & Sakida, S 2006, Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations. in Ceramic Transactions. vol. 196, Ceramic Transactions, vol. 196, pp. 491-496, 6th Pacific Rim Conference on Ceramic and Glass Technology, Maui, Hawaii, United States, 9/11/05.
Domori Y, Nanba T, Miura Y, Sakida S. Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations. In Ceramic Transactions. Vol. 196. 2006. p. 491-496. (Ceramic Transactions).
Domori, Y. ; Nanba, Tokuro ; Miura, Y. ; Sakida, Shinichi. / Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations. Ceramic Transactions. Vol. 196 2006. pp. 491-496 (Ceramic Transactions).
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