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자연과학대학
화학·나노과학전공
Journal papers
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Biomineralized N-doped CNT/TiO 2 core/shell nanowires for visible light photocatalysis
Title
Biomineralized N-doped CNT/TiO 2 core/shell nanowires for visible light photocatalysis
Authors
Lee W.J.
;
Lee J.M.
;
Kochuveedu S.T.
;
Han T.H.
;
Jeong H.Y.
;
Park M.
;
Yun J.M.
;
Kwon J.
;
No K.
;
Kim D.H.
;
Kim S.O.
Ewha Authors
김동하
SCOPUS Author ID
김동하
Issue Date
2012
Journal Title
ACS Nano
ISSN
1936-0851
Citation
ACS Nano vol. 6, no. 1, pp. 935 - 943
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
Abstract
We report an efficient and environmentally benign biomimetic mineralization of TiO 2 at the graphitic carbon surface, which successfully created an ideal TiO 2/carbon hybrid structure without any harsh surface treatment or interfacial adhesive layer. The N-doped sites at carbon nanotubes (CNTs) successfully nucleated the high-yield biomimetic deposition of a uniformly thick TiO 2 nanoshell in neutral pH aqueous media at ambient pressure and temperature and generated N-doped CNT (NCNT)/TiO 2 core/shell nanowires. Unlike previously known organic biomineralization templates, such as proteins or peptides, the electroconductive and high-temperature-stable NCNT backbone enabled high-temperature thermal treatment and corresponding crystal structure transformation of TiO 2 nanoshells into the anatase or rutile phase for optimized material properties. The direct contact of the NCNT surface and TiO 2 nanoshell without any adhesive interlayer introduced a new carbon energy level in the TiO 2 band gap and thereby effectively lowered the band gap energy. Consequently, the created core/shell nanowires showed a greatly enhanced visible light photocatalysis. Other interesting synergistic properties such as stimuli-responsive wettabilites were also demonstrated. © 2011 American Chemical Society.
DOI
10.1021/nn204504h
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