Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 43, Pages 13490-13495Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12925j
Keywords
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Funding
- National Key Basic Research Program of China [2013CB934104, 2012CB224805]
- NSF of China [21322311, 21071033, 20890123]
- Program for New Century Excellent Talents in University [NCET-10-0357]
- Shanghai Pujiang Program [10PJ1401000]
- Shanghai Institutions of Higher Learning
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Free-standing mesoporous carbon-silica composite films with different silica contents are successfully prepared with a crack-free morphology, square centimeter size, and a highly ordered mesostructure. The films are first synthesized on Al2O3-coated Si substrates by spin-coating of a tri-constituent solution, in which triblock copolymer Pluronic F127, resin and tetraethoxylsilane (TEOS) are used as the template, carbon and silica precursors, respectively. After the organic-inorganic assembly, calcination, and etching of the intermediate Al2O3 layer, the free-standing mesoporous carbon-silica composite films are obtained. The mechanical property, water wettability and electrical conductivity are well adjusted with different carbon-silica ratios. Furthermore, the free-standing carbon or silica films are also prepared by hydrofluoric acid etching of the carbon-silica composite film or calcination in air, owing to the three-dimensional (3D) interpenetrated frameworks of their parental carbon-silica composite films. The surface area of the obtained free-standing carbon film is extremely high up to similar to 2030 m(2) g(-1), which is similar to 4 times larger than that of its parental carbon-silica composite thin film.
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