Visible-light active nanohybrid TiO2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates

Title
Visible-light active nanohybrid TiO2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates
Authors
Saji Thomas Kochuvee장유진장윤희이원준차민아심혜영윤석현이상수김상욱신관우Martin Steinhart김동하
Keywords
TiO2; carbon hybrid materials; carbonization of block copolymer; Visible-light active photocatalysts
Issue Date
2011-11
Publisher
Green chemistry : an international journal and green chemistry resource : GC
Citation
VOL 13, NO 12, 3397-3405
Abstract
Nanopatterned TiO2/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 TiO2 dots in carbon matrices or carbon dots in TiO2 matrices as well as their powder type samples were obtained by varying the ratio of TiO2 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 TiO2. The latter can be considered as the origin of the band narrowing and visible light absorption. The obtained carbon–TiO2 nanostructures showed pronounced visible-light photocatalytic activity.
URI
http://pubs.kist.re.kr/handle/201004/40635
ISSN
1463-9262
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KIST Publication > Article
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