title: Direct formation of anatase TiO2 nanoparticles on carbon nanotubes by atomic layer deposition and their photocatalytic properties.
abstract: TiO2 with different morphology was deposited on acid-treated multi-walled carbon nanotubes (CNTs) by atomic layer deposition at 100 °C-300 °C to form a TiO2@CNT structure. The TiO2 fabricated at 100 °C was an amorphous film, but became crystalline anatase nanoparticles when fabricated at 200 °C and 300 °C. The saturation growth rates of TiO2 nanoparticles at 300 °C were about 1.5 and 0.4 Å/cycle for substrate-enhanced growth and linear growth processes, respectively. It was found that the rate constants for methylene blue degradation by the TiO2@CNT structure formed at 300 °C were more suitable to fit with second-order reaction. The size of 9 nm exhibited the best degradation efficiency, because of the high specific area and appropriate diffusion length for the electrons and holes.
authors: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan.
authors: Sheng-Hsin
authors: SH
authors: Huang
authors: Shih-Yun
authors: SY
authors: Liao
authors: Chih-Chieh
authors: CC
authors: Wang
authors: Chi-Chung
authors: CC
authors: Kei
authors: Jon-Yiew
authors: JY
authors: Gan
authors: Tsong-Pyng
authors: TP
authors: Perng