Biomineralized N-Doped CNT/TiO2 Core/Shell Nanowires for Visible Light Photocatalysis

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• 作者：Won Jun Lee ; Ju Min Lee ; Saji Thomas Kochuveedu ; Tae Hee Han ; Hu Young Jeong ; Moonkyu Park ; Je Moon Yun ; Joon Kwon ; Kwangsoo No ; Dong Ha Kim ; Sang Ouk Kim
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：January 24, 2012
• 年：2012
• 卷：6
• 期：1
• 页码：935-943
• 全文大小：1181K
• 年卷期：v.6,no.1(January 24, 2012)
• ISSN：1936-086X

文摘

We report an efficient and environmentally benign biomimetic mineralization of TiO₂ at the graphitic carbon surface, which successfully created an ideal TiO₂/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 TiO₂ nanoshell in neutral pH aqueous media at ambient pressure and temperature and generated N-doped CNT (NCNT)/TiO₂ 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 TiO₂ nanoshells into the anatase or rutile phase for optimized material properties. The direct contact of the NCNT surface and TiO₂ nanoshell without any adhesive interlayer introduced a new carbon energy level in the TiO₂ 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.

Keywords:

biomineralization; carbon nanotubes; doping; TiO₂; photocatalysis