Synthesis of TiO2 nanostructures by an electrochemical approach and their applications = 전기화학적 양극산화법을 이용한 TiO2 나노구조 합성 및 응용

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Synthesis of One-Dimensional (1-D) nanostructures transition metal-oxide materials gained a lot of attention of the scientific community in the last few decades due to their unique properties and potential application in various fields. Particularly $TiO_2$ (titanium-di-oxide or titania) nanostructures (nanoparticles, nanotubes and nanoporous arrays) have been extensively investigated because of their semiconducting nature and versatile applications. Among all the existence synthesis routes of $TiO_2$ nanostructure, electrochemical approach (anodization) is very simple and straight forward process which offers many advantages such as low cost, control over morphology, highly-ordered, vertically oriented, and self-organized oxide nanostructures growth with high-aspect ratio. Anodization of Ti sheet in fluoride containing organic viscous electrolytes under optimized conditions always produced self-organized, highly-ordered and vertically oriented high aspect ratio $TiO_2$ nanotubes with extremely smooth walls morphology. Anodization generally produced nanotubular and nanoporous structure on various valuable metals and alloys. In this study, we report the mass production synthesis of $TiO_2$ nanoparticles for the first time using anodization process. The size of $TiO_2$ nanoparticles was tailored by changing the concentration of the electrolyte in the anodizing process. $TiO_2$ nanoparticles showed higher photocatalytic activity compared to Degussa (P25) under the same conditions. Metal-oxide nanoparticles of various materials such as In, Sn, Ni, Fe, Zn and Cu can also be mass-produced using the same technique. An innovative technique of N_2 gas blowing in conjunction with methanol wetting onto fabricated $TiO_2$ nanotubes after anodization lead to the readily separation of nanotubes from underlying Ti sheet, generating large-scale and robust free-standing TiO2 nanotubes arrays membranes. The approach also provides very clean and shiny, homogeneous and honeycomb-...
Advisors
Cho, Sung-Ohresearcher조성오
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
565583/325007  / 020095385
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2013.8, [ xiii, 111 p. ]

Keywords

Electrochemistry; 자외선; 광촉매작용; 나노물질; 막; 나노기공; Anodization; Titania; Nanotubes; Nanoaprticles; Nanopores; Membranes; Nanomaterials; Photocatalysis; UV; 전기화학; 양극 산화; 티타니아; 나노튜브; 나노입자

URI
http://hdl.handle.net/10203/197260
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=565583&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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