期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 14, 页码 7767-7775出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01010
关键词
SiO2; TiO2; thin film; comb copolymer; photocatalytic property
资金
- National Research Foundation (NRF) [NRF-2014K2A1B8047524]
- Center for Advanced Meta-Materials (CAMM) [2014M3A6B3063716]
- Korea Center for Artificial Photosynthesis (KCAP) [2009-0093883]
We report the facile synthesis of a well-organized meso-macroporous TiO2/SiO2 thin film with high porosity and good interconnectivity from a binary mixture (i.e., titania precursor and polymer template). Our process is based on self-assembly of the amphiphilic rubbery comb copolymer, poly(dimethylsiloxane)-g-poly(oxyethylene methacrylate) (PDMS-g-POEM) with titanium tetraisopropoxide (TTIP). SiO2 is self-provided by thermal oxidation of PDMS chains during calcination under air. The selective, preferential interaction between TTIP and the hydrophilic POEM chains was responsible for the formation of well-organized TiO2/SiO2 films, as supported by transmission electron microscopy, scanning electron microscopy, X-ray photospectroscopy, and X-ray diffraction analyses. We investigated in detail the effect of precursor content, solvent type, and polymer concentration on thin film morphology. Photodegradation of methyl orange by the well-organized meso-macroporous TiO2/SiO2 film was greater than that of a dense TiO2 film prepared without PDMS-g-POEM as well as a SiO2-etched TiO2 film. These results indicate that the well-organized structure and SiO2 doping of the TiO2 film play a pivotal role in enhancing its photocatalytic properties.
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