Oxidation-Resistant Coating of Carbon Fibers with TiO&lt;sub&gt;2&lt;/sub&gt; by Sol-Gel Method

Hashishin, Takeshi; Murashita, Junko; Joyama, Atsunori; Kaneko, Yasunari

doi:10.2109/jcersj.106.1

Cited by 29 publications

(7 citation statements)

References 3 publications

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“…It is important to emphasize that the physical mixtures and the sol-gel composites could differ not only on crystallite size, but also on TiO 2 /CB microstructure, since carbon materials become coated by TiO 2 during the sol-gel synthesis forming core-shell geometries [27,28]. Moreover, minor peaks assigned to the rutile phase are observed in solgel powders while commercial TiO 2 (anatase) is free of rutile up to 600 8C.…”

Section: Structural and Optical Propertiesmentioning

confidence: 99%

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

2005

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Section: Structural and Optical Propertiesmentioning

confidence: 99%

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

2005

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“…The high rate of photo-generated electron-hole recombination in TiO 2 particles results in low efficiency of photocatalysis. To date, a variety of strategies have been employed to improve the photocatalytic performance of TiO 2 , for example, textural design, 11,12 doping, [13][14][15][16][17] and coupling TiO 2 with metal or other semiconductors, [18][19][20][21][22][23][24] etc. In particular, great interest has been devoted to combining carbon nanotubes (CNTs) with TiO 2 to enhance its photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of mesoporous TiO₂aggregates by embedding carbon nanotubes as electron-transfer channel

Wang

Liu

2011

Phys. Chem. Chem. Phys.

499

275

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Mesoporous multiwalled carbon nanotubes/titanium dioxide (CNTs/TiO(2)) nanocomposites with low loading amounts (0-0.5 wt%) of CNTs embedded inside mesoporous TiO(2) aggregates has been prepared by a simple one-pot hydrothermal method using titanium sulfate as titanium source. The as-prepared CNTs/TiO(2) samples are carefully characterized, analyzed and discussed. In contrast to previous reports with high CNT loading, our results indicate that a low CNT loading slightly influences the textural properties (including crystallite size, degree of crystallinity, specific surface areas, and pore volume etc.) and UV-light absorption of the mesoporous TiO(2) aggregates. The SEM and TEM results demonstrate that the CNTs are mostly embedded in the mesoporous TiO(2) aggregates. Moreover, chemical bonds are formed at the interface between CNTs and TiO(2), which is confirmed by the Raman, IR and XPS analyses. Significantly, we point out that PL analysis in terms of intensity of PL signals seems to not be a reliable way to monitor the recombination rate in the CNTs/TiO(2) composite, due to the quenching effect of CNTs. Instead, the analysis of transient photocurrent responses is introduced, which definitely reflects CNTs as fast electron transfer channels in chemically-bonded CNTs/TiO(2) composites with low CNT loading. Notably, the positive synergy effects of CNTs and TiO(2) depend on both the CNT loading amount and the state of interfacial contacts. In our study, only these chemically bonded CNTs/TiO(2) nanocomposites with appropriate loading amounts (<0.1 wt%) favor the separation of photogenerated electron-hole pairs and decrease their recombination rate and thus display significantly enhanced photocatalytic activity for degrading acetone in air under UV irradiation, as compared with pristine TiO(2) counterparts and commercial P25 photocatalyst. In contrast, a high CNT loading (>0.1 wt%) results in a decrease in photocatalytic activity; a simple mechanical mixing of CNTs and TiO(2) without forming chemical bonds at the interface also results in inferior photocatalytic performance.

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“…It has been also proposed that CFs can be coated with TiO 2 by the sol-gel method to suppress oxidation. [46] According to TG-DTA results, the CF itself started to be oxidized at around 500 8C and completely decomposed at 900 8C. Surprisingly, however, oxidation did not happen even at 1000 8C with the TiO 2 coating.…”

Section: Thermal Resistancementioning

confidence: 95%

Effective Surface Functionalization of Carbon Fibers for Fiber/Polymer Composites with Tailor‐Made Interfaces

et al. 2014

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Composites between carbon fibers (CFs) and heterogeneous materials have been widely studied and their fabrication techniques have been developed. However, their hydrophobic surfaces make it difficult to disperse CFs into hydrophilic resins, which results in weak junctions with ceramics. To develop high‐strength composite fibers, it is important to design interfacial chemical bonds. Thus, surface‐modification techniques of CFs have recently become the main focus and their interfaces have been characterized by various analytical methods. In this Minireview, various techniques that modify the CF surface by coating with inorganic polymers (metal oxide compounds) are highlighted, and the applications of novel nanocomposite fibers are also described. Furthermore, interfacial bonds between CFs and polymer resins are reviewed and discussed in terms of CF‐reinforced plastics and their future prospects.

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Oxidation-Resistant Coating of Carbon Fibers with TiO<sub>2</sub> by Sol-Gel Method

Cited by 29 publications

References 3 publications

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

Enhanced photocatalytic activity of mesoporous TiO₂aggregates by embedding carbon nanotubes as electron-transfer channel

Effective Surface Functionalization of Carbon Fibers for Fiber/Polymer Composites with Tailor‐Made Interfaces

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Oxidation-Resistant Coating of Carbon Fibers with TiO<sub>2</sub> by Sol-Gel Method

Cited by 29 publications

References 3 publications

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

Enhanced photocatalytic activity of mesoporous TiO2aggregates by embedding carbon nanotubes as electron-transfer channel

Effective Surface Functionalization of Carbon Fibers for Fiber/Polymer Composites with Tailor‐Made Interfaces

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Enhanced photocatalytic activity of mesoporous TiO₂aggregates by embedding carbon nanotubes as electron-transfer channel