Research Paper

Journal of Nanoparticle Research

, Volume 11, Issue 6, pp 1339-1348

Photocatalytic activity of nanostructured TiO2 films produced by supersonic cluster beam deposition

  • Flavio Della FogliaAffiliated withDipartimento di Fisica and C.I.MA.I.NA, Università degli Studi di Milano
  • , Tonia LoscoAffiliated withDipartimento di Fisica and C.I.MA.I.NA, Università degli Studi di Milano
  • , Paolo PiseriAffiliated withDipartimento di Fisica and C.I.MA.I.NA, Università degli Studi di Milano
  • , Paolo MilaniAffiliated withDipartimento di Fisica and C.I.MA.I.NA, Università degli Studi di Milano
  • , Elena SelliAffiliated withDipartimento di Chimica Fisica ed Elettrochimica and C.I.MA.I.NA, Università degli Studi di Milano Email author 

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Abstract

The photocatalytic activity of thin, nanostructured films of titanium dioxide, synthesized by supersonic cluster beam deposition (SCBD) from the gas phase, has been investigated employing the photodegradation of salicylic acid as test reaction. Because of the low deposition energy, the so-deposited highly porous TiO2 films are composed of nanoparticles maintaining their original properties in the film, which can be fully controlled by tuning the deposition and post-deposition treatment conditions. A systematic investigation on the evolution of light absorption properties and photoactivity of the films in relation to their morphology, determined by AFM analysis, and phase composition, determined by Raman spectroscopy, has been performed. The absorption and photocatalytic activity of the nanostructured films in the visible region could be enhanced either through post-deposition annealing treatment in ammonia containing atmosphere or employing mild oxidation conditions, followed by annealing in N2 at 600 °C.

Keywords

Supersonic cluster beam deposition Titanium dioxide films Photocatalytic activity Nanomaterials Semiconductors