Photoreduction of Ag ion on ZnO single crystal

Kinuyo Kawano, Manabu Komatsu, Yoshiyuki Yajima, Hajime Haneda, Hideyuki Maki, Taisei Yamamoto

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


The photoreduction of Ag ion was studied on ZnO single-crystal surface: Zn polar surface (0 0 0 1) and O polar surface (0 0 0 1̄). The single crystals were prepared by a hydrothermal process. Although Ag precipitate did not grow on a non-photocatalytic crystal, such as Al 2 O 3 , under UV irradiation, Ag ion in aqueous solution was rapidly reduced on ZnO single-crystal surface under UV irradiation. We found that the reactivity of Zn polar surface was higher than that of O polar surface and that the Ag deposition modes differed. To clarify the reaction mechanism, we performed a chemical analysis of the solution and Ag precipitates on ZnO surfaces by ICP and measured the pH of the solution. The results show that zinc ions were dissolved into solution from ZnO single-crystal surface, i.e., by photolysis, but there was less photolysis at the Zn than O polar surface.

Original languageEnglish
Pages (from-to)265-270
Number of pages6
JournalApplied Surface Science
Issue number3-4
Publication statusPublished - 2002 Apr 28
Externally publishedYes


  • Photocatalytic activity
  • Photolysis
  • Photoreduction
  • Silver ion
  • Zinc oxide single crystal

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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