Hydrophilic/Hydrophobic Conversion of $TiO_2$ Films by Reactive Magnetron Sputtering

Reactive Magnetron Sputtering법으로 제조된 $TiO_2$의 친수성/소수성 변환 특성

  • 이영철 (아주대학교 재료공학과) ;
  • 박용환 (아주대학교 재료공학과) ;
  • 안재환 (아주대학교 재료공학과) ;
  • 고경현 (아주대학교 재료공학과)
  • Published : 1999.11.01

Abstract

TiO2 thin films were prepared by reactive magnetron sputtering on glass substrate and subjected into investigation about their hydrophilic properties. Varing Ar/O2 ration and post annealing at 50$0^{\circ}C$ for 12h anatase and rutile phases of TiO2 films were obtained. Hydrophilic properties were evaluated by determination of contact angle of water droplet on TiO2 surface. On as-annealed TiO2 films water droplet spreaded widely with ~0$^{\circ}$contact angle. Sonication(60 Hz, 28kHz 40kHz) and following dark room treatments turned these hydrophilic TiO2 films into hydrophobic state. All of hydrophobic films were converted recersibly into their original state after UV illumination. Hydrophobic states of anatase films were saturated after sonication and remain same during dark room treatment. But it was found that the conversion into hydrophobic state of rutile films progressed. further after sonication. Therefore it was concluded that Ti3+/Ti+4 ratio is the key to determine hydrophilicity of TiO2 surface so that different surface structure of polymorphs could lead to unique characteristics.

References

  1. J. Catalysis v.179 no.375-389 Photothermal Heterogeous Oxidation of Ethanol Over Pt/TiO₂ J.C. Kennedy III;A.K. Datye
  2. Chem. Rev. v.93 no.341-357 Heterogeous Photocatalysis M.A. Fox;M.T. Dulay
  3. Chem. Rev. v.95 no.69-96 Environmental Applications of Semiconductor Photocatalysis M.R. Hoffmann;Scot T. Martin;W. Choi;D.W. Bahmann
  4. J. Electrochem. Soc. v.143 no.5 Photolytic and Photocatalytic Destruction of Formaldehyde in Aqueous Media E.M. Shin;R. Senthurchelvan;J. Munoz;S. Basak;K. Rajeshwar
  5. Catalysis Today v.39 no.207-218 Quantilative Studies on the Heterogeous gas-phase Photooxidation of CO and Simple VOCs by Air over TiO₂ A.V. Vorontsov;E.N. Savinov;G.B. Baranik;V.N. Troitsky;V.N. Parmon
  6. Environ Sci. Technol. v.31 no.1440-1445 Role of Water in the Photocatalytic Degradation of Trichloroethylene Vapor on TiO₂Films C.H. Hung;B.I. Marinas
  7. Catalysis Today v.40 no.85-101 Photocatalytic Oxidantion of Organic Pollutants in Water C. Dominguez;J. Garcia;M.A. Perdraz;A. Torres;M.A. Galan
  8. Thin Solid Films v.334 no.103-108 The Effect of Properties of Semiconductor Oxide Thin Films on Photocatalytic Decomposition of Dyeing Waste Water T. Wang;H. Wang;P. Xu;X. Zhao;Y. Liu;S. Chao
  9. J. Mater. Sci : Mater. in Electro. v.9 no.327-330 Effects of Substrate Temperature on the Microstructure and Photocatalytic Reactivity of TiO₂Films H. Wang;T. Wang;P. Xu
  10. Adv. Mater. v.10 no.2 Photogenaration of Highly Amphipfilic TiO₂Surfaces R. Wang;K. Hashimoto;A. Fujishima;M. Chikuni;A. Kitamura;M. Shimohigoshi;T. Watanabe
  11. Nature v.388 no.431-432 Light-induced Amphiphilic Surfaces R. Wang;K. Hashimoto;A. Fujishima;M. Cjikuni;E. Kojima;A. Kitamura;M. Shimohigoshi;T. Watanabe
  12. Langmuir v.14 no.5918-5920 Effect of ultrasonic Treatment on Highly Hydrophilic TiO₂Surfaces N. Sakai;R. Wang;A. Fujishima;T. Watanabe;K. Hashimoto
  13. Chem. Rev. v.95 no.735-758 Photocatalysis on TiO₂Surfaces. Punciples. Mechanisms and Selected Results A.L. Linsebigler;G. Lu;J.T. Yates JR.
  14. 한국재료학회지 v.6 no.8 반응성 스피터링된 산화 티타늄 박막의 결정화 특성 이필홍;고경현;안재환;이순일