Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer

Jonghyun Kim, Jinsoo Kim, Myeongkyu Lee

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13 Citations (Scopus)


We here report that the abrasion resistance of nanoparticulate TiO2 self-cleaning layers can be highly enhanced without a considerable loss of photocatalytic capability. TiO2 coating layers solution-deposited onto the glass substrate were irradiated by a pulsed ultraviolet (UV) laser at 355nm, which modified the surface morphologies via laser-induced local melting of TiO2 nanoparticles. The surface hardness, measured by pencil scratch test, improved with increasing laser power (P). While an unmodified TiO2 layer revealed a hardness of 6B, it increased to 2H after the surface was irradiated at P=0.3W. Almost all of the stearic acid deposited on an unmodified sample disappeared after UV exposure for 12h. The photocatalytic decomposition was slowed down on laser-irradiated TiO2 surfaces and this is attributed to the reduction of specific surface areas as a result of the morphological modifications. However, a TiO2 layer hardened to 2H still exhibited fairly good photocatalytic activity, decomposing more than 75% of the stearic acid after exposure for the same duration.

Original languageEnglish
Pages (from-to)372-376
Number of pages5
JournalSurface and Coatings Technology
Issue number2
Publication statusPublished - 2010 Oct

All Science Journal Classification (ASJC) codes

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


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