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Visible-light active nanohybrid TiO 2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates

Title
Visible-light active nanohybrid TiO 2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates
Authors
Kochuveedu S.T.Jang Y.J.Jang Y.H.Lee W.J.Cha M.-A.Shin H.Yoon S.Lee S.-S.Kim S.O.Shin K.Steinhart M.Kim D.H.
Ewha Authors
윤석현김동하
SCOPUS Author ID
윤석현scopus; 김동하scopus
Issue Date
2011
Journal Title
Green Chemistry
ISSN
1463-9262JCR Link
Citation
vol. 13, no. 12, pp. 3397 - 3405
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Nanopatterned TiO 2/carbon hybrid materials with tailored morphologies were produced by spin-coating solutions of amphiphilic poly(styrene-block-ethylene oxide) (PS-b-PEO) and inorganic precursors followed by sequential stabilization and carbonization. This synthetic strategy is based on cooperative sol-gel chemistry and self-assembly of block copolymers (BCPs), as well as on direct carbonization of the structure-directing BCP templates without additional carbon precursors. Thin films and powders consisting of either TiO 2 dots in carbon matrices or carbon dots in TiO 2 matrices as well as their powder type samples were obtained by varying the ratio of TiO 2 sol-gel precursor to PS-b-PEO. X-ray photoelectron spectroscopy (XPS) revealed the formation of Ti-O-C bonds upon carbonization, as a result of additional electronic states in TiO 2. The latter can be considered as the origin of the band narrowing and visible light absorption. The obtained carbon-TiO 2 nanostructures showed pronounced visible-light photocatalytic activity. © 2011 The Royal Society of Chemistry.
DOI
10.1039/c1gc15724h
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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