A facile one-pot wet chemical process to prepare pure anatase TiO2 hollow structures using ammonium hexafluorotitanate as a precursor is developed. By defining the formic acid ratio, we fabricate TiO2 hollow structures containing fluorine on the surface. The TiO2 hollow sphere is composed of an anatase phase containing fluorine by various analytical techniques. A possible formation mechanism for the obtained hollow samples by self-transformation and Ostwald ripening is proposed. The TiO2 hollow structures containing fluorine exhibits 1.2 - 2.7 times higher performance than their counterparts in photocatalytic activity. The enhanced photocatalytic activity of the TiO2 hollow structures is attributed to the combined effects of high crystallinity, specific surface area (62 m2g-1), and the advantage of surface fluorine ions (at 8%) having strong electron-withdrawing ability of the surface ≡ Ti-F groups reduces the recombination of photogenerated electrons and holes.

Abstract
1. 서 론
2. 실험 방법
    2.1 원료
    2.2 TiO2 중공 구조체 제조
    2.3 특성 분석
    2.4 광촉매 활성 평가
3. 결과 및 고찰
4. 결 론
References

• 이덕희(고등기술연구원 융합소재연구센터) | Duk-Hee Lee (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering)
• 박경수(고등기술연구원 융합소재연구센터) | Kyung-Soo Park (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering)
• 박재량(고등기술연구원 융합소재연구센터) | Jae-Ryang Park (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering)
• 이찬기(고등기술연구원 융합소재연구센터) | Chan-Gi Lee (Materials Science & Chemical Engineering Center, Institute for Advanced Engineering) Corresponding Author