Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Photochemical Reaction and Characterization of TiO2 Thin Film Photocatalyst Fabricated by Sol-Gel Method

졸-겔 방법으로 제조한 TiO2박막 광촉매의 물성 분석과 광화학 반응

  • Lim, Hee-Sup (Research Institute of Basic Sciences and Department of Physics, Department of Chemistry, Dongeui University) ;
  • Lee, Yong-Hee (Research Institute of Basic Sciences and Department of Physics, Department of Chemistry, Dongeui University) ;
  • Son, Jong-Yun (Research Institute of Basic Sciences and Department of Physics, Department of Chemistry, Dongeui University) ;
  • Yu, Yun-Sik (Research Institute of Basic Sciences and Department of Physics, Department of Chemistry, Dongeui University) ;
  • Lee, Dong-Hwan (Research Institute of Basic Sciences and Department of Physics, Department of Chemistry, Dongeui University) ;
  • Sung, Dae-Dong (Department of Chemistry, Donga University)
  • 임희섭 (동의대학교 기초과학연구소 및 물리과, 화학과) ;
  • 이용희 (동의대학교 기초과학연구소 및 물리과, 화학과) ;
  • 손종윤 (동의대학교 기초과학연구소 및 물리과, 화학과) ;
  • 유윤식 (동의대학교 기초과학연구소 및 물리과, 화학과) ;
  • 이동환 (동의대학교 기초과학연구소 및 물리과, 화학과) ;
  • 성대동 (동아대학교 화학과)
  • Received : 2004.06.03
  • Accepted : 2005.01.04
  • Published : 2005.04.10
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Abstract

The photocatalyst $TiO_2$ thin film was made from titanium (IV) isopropoxide, ethanol, and HCl by sol-gel method. The surface observation by SEM showed the sample that was coated 5 times at $500^{\circ}C$ had good properties. The component ratio, in atom% of O : Ti by EDX analysis, of 61 : 39 by spin coating was superior than dip coating. It was found that crystal structure changed from anatase phase to rutile phase as a function of the temperature of thin film fabrication, and this was measured by XRD. The photolysis efficiency of total organic compounds (TOC) by lighting UV beam on $TiO_2$ thin film showed 20%~65% within 1 h, and decreased slowly thereafter.

광촉매 $TiO_2$박막은 titanium (IV) isopropoxide, 에탄올, HCl을 일정한 비율로 졸-겔방법에 의해 제작하였다. SEM에 의한 표면관찰에서는 $500^{\circ}C$에서 5회 반복해서 코팅하여 제작한 것이 우수했다. EDX에 의한 성분비는 spin코팅이 O : Ti의 atom%가 61 : 39로 dip코팅보다 우수했다. 그리고 박막제작의 온도에 따라서 anatase상에서 rutile상으로 결정구조가 변화되어 가는 것을 XRD측정으로 알았다. 제작한 $TiO_2$박막에 UV빔을 조사해서 얻은 TOC의 광분해효율이 1 h 이내에 20~65%를 나타내었고, 그 이후에는 서서히 감소하는 것을 확인했다.

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