In situ synthesis of noble metal nanoparticles in ultrathin TiO2-gel films by a combination of ion-exchange and reduction processes

Junhui He, Izumi Ichinose, Toyoki Kunitake, Aiko Nakao

Research output: Contribution to journalArticle

146 Citations (Scopus)

Abstract

We have explored in situ synthesis of noble metal nanoparticles in ultrathin TiO2-gel films, in view of the increasing importance of such nanoparticle-containing thin films. The two-step procedure consists of ion exchange in the ultrathin matrix and subsequent reduction of metal ions to nanoparticles by low-temperature H2 plasma, by aqueous NaBH4, and by UV irradiation. Smooth and transparent ultrathin TiO2 films containing noble metal (Ag, Au, Pd, Pt) particles of 2-10 nm were readily obtained by this approach. The size and distribution of metal nanoparticles could be controlled by changing reaction conditions. The film thickness was precisely controlled by the cycle of film assembly. The low-temperature H2 plasma treatment, first used for preparation of noble metal nanoparticles, showed interesting advantages over chemical and photoinduced reductions in fabrication of nanoparticle-containing inorganic thin films.

Original languageEnglish
Pages (from-to)10005-10010
Number of pages6
JournalLangmuir
Volume18
Issue number25
DOIs
Publication statusPublished - Dec 10 2002
Externally publishedYes

Fingerprint

Metal nanoparticles
Precious metals
noble metals
Ion exchange
Gels
gels
Nanoparticles
nanoparticles
synthesis
Plasmas
Thin films
ions
Ultrathin films
cold plasmas
Metal ions
Film thickness
Irradiation
Fabrication
Temperature
thin films

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

In situ synthesis of noble metal nanoparticles in ultrathin TiO2-gel films by a combination of ion-exchange and reduction processes. / He, Junhui; Ichinose, Izumi; Kunitake, Toyoki; Nakao, Aiko.

In: Langmuir, Vol. 18, No. 25, 10.12.2002, p. 10005-10010.

Research output: Contribution to journalArticle

He, Junhui ; Ichinose, Izumi ; Kunitake, Toyoki ; Nakao, Aiko. / In situ synthesis of noble metal nanoparticles in ultrathin TiO2-gel films by a combination of ion-exchange and reduction processes. In: Langmuir. 2002 ; Vol. 18, No. 25. pp. 10005-10010.
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