Visible-light active nanohybrid TiO2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates
- Visible-light active nanohybrid TiO2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates
- Saji Thomas Kochuvee; 장유진; 장윤희; 이원준; 차민아; 심혜영; 윤석현; 이상수; 김상욱; 신관우; Martin Steinhart; 김동하
- TiO2; carbon hybrid materials; carbonization of block copolymer; Visible-light active photocatalysts
- Issue Date
- Green chemistry : an international journal and green chemistry resource : GC
- VOL 13, NO 12, 3397-3405
- 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.
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