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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Control of TiO2 nanostructures from hollow microsphere to microtube

등록일
2019년 8월 29일 14시 13분 11초
접수번호
1818
발표코드
MAT.P-379 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Material Chemistry
저자 및
공동저자
Youngin Jeon, Wan-In Lee1,*
Department of Chemistry and Chemical engineering, Inha University, Korea
1Department of Chemistry, Inha University, Korea
Tailoring of TiO2 nanostructures with large surface area, high crystallinity, and controlled shape and pore structures would be a crucial subject in diversifying their applications such as photocatalysts, sensors, photovoltaic and electrochromic devices, and others. Hollow TiO2 microspheres, which have unique pore structure in the wall and large inner space, have been prepared by a spray pyrolysis technique or by a sol-gel reaction utilizing polymer or silica microspheres as templates. For the first time, in this work, we selectively synthesized hollow TiO2 microspheres and microtubes in a rich alkylamine environment during solvothermal reaction without the addition of any templates or surfactants. The prepared hollow TiO2 microspheres and microtubes are composed of highly crystallized anatase TiO2 nanoparticles without any impurity phase or contamination with inorganic ions. Furthermore, each structure is physically strong and demonstrates extended thermal stability during calcination without pinholes or cracks on its surface. However, controlling the size of hollow TiO2 microspheres and microtubes still remains very difficult. As mentioned above, hollow TiO2 microspheres are formed during solvothermal reaction in a rich alkylamine environment, whereas TiO2 microtubes can be created when both of Ti-alkoxide and alkylamine are further increased. It is worthy of note that the ratio of Ti-alkoxide and alkylamine should be maintained in a suitable range to obtain microtube morphology. If the alkylamine content is too high, TiO2 microtube structures are broken to nanoparticles.

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