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

Saji Thomas Kochuveedu, Yu Jin Jang, Yoon Hee Jang, Won Jun Lee, Min Ah Cha, Haeyoung Shin, Seokhyun Yoon, Sang-Soo Lee, Sang Ouk Kim, Kwanwoo Shin, Martin Steinhart, Dong Ha Kim

Research output: Contribution to journalArticle

37 Citations (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.

Original languageEnglish
Pages (from-to)3397-3405
Number of pages9
JournalGreen Chemistry
Volume13
Issue number12
DOIs
Publication statusPublished - 2011 Dec 1

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Carbonization
Photocatalysts
Block copolymers
Carbon
carbon
Polyethylene oxides
Powders
Sol-gels
gel
Ethylene Oxide
matrix
Styrene
Hybrid materials
Spin coating
Electronic states
Self assembly
Light absorption
ethylene
X-ray spectroscopy
Nanostructures

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Visible-light active nanohybrid TiO 2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates. / Kochuveedu, Saji Thomas; Jang, Yu Jin; Jang, Yoon Hee; Lee, Won Jun; Cha, Min Ah; Shin, Haeyoung; Yoon, Seokhyun; Lee, Sang-Soo; Kim, Sang Ouk; Shin, Kwanwoo; Steinhart, Martin; Kim, Dong Ha.

In: Green Chemistry, Vol. 13, No. 12, 01.12.2011, p. 3397-3405.

Research output: Contribution to journalArticle

Kochuveedu, ST, Jang, YJ, Jang, YH, Lee, WJ, Cha, MA, Shin, H, Yoon, S, Lee, S-S, Kim, SO, Shin, K, Steinhart, M & Kim, DH 2011, 'Visible-light active nanohybrid TiO 2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates', Green Chemistry, vol. 13, no. 12, pp. 3397-3405. https://doi.org/10.1039/c1gc15724h
Kochuveedu, Saji Thomas ; Jang, Yu Jin ; Jang, Yoon Hee ; Lee, Won Jun ; Cha, Min Ah ; Shin, Haeyoung ; Yoon, Seokhyun ; Lee, Sang-Soo ; Kim, Sang Ouk ; Shin, Kwanwoo ; Steinhart, Martin ; Kim, Dong Ha. / Visible-light active nanohybrid TiO 2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates. In: Green Chemistry. 2011 ; Vol. 13, No. 12. pp. 3397-3405.
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