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Gels 2017, 3(3), 24; doi:10.3390/gels3030024

Metal Oxide/TiO2 Hybrid Nanotubes Fabricated through the Organogel Route

Graduate School of Science and Technology, Shinshu University, Ueda, Nagano 386-8567, Japan
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Received: 18 May 2017 / Revised: 20 June 2017 / Accepted: 20 June 2017 / Published: 22 June 2017
(This article belongs to the Special Issue Gels as Templates for Transcription)
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Abstract

Titanium dioxide (TiO2) nanotube and its hybrid nanotubes (with various metal oxides such as Ta2O5, Nb2O5, ZrO2, and SiO2) were fabricated by the sol-gel polymerization in the ethanol gels formed by simple l-lysine-based organogelator. The self-assembled nanofibers (gel fibers) formed by the gelator functioned as a template. The different calcination temperatures gave TiO2 nanotubes with various crystalline structures; e.g., anatase TiO2 nanotube was obtained by calcination at 600 °C, and rutile TiO2 nanotube was fabricated at a calcination temperature of 750 °C. In the metal oxide/TiO2 hybrid nanotubes, the metal oxide species were uniformly dispersed in the TiO2 nanotube, and the percent content of metal oxide species was found to correspond closely to the feed ratio of the raw materials. This result indicated that the composition ratio of hybrid nanotubes was controllable by the feed ratio of the raw materials. It was found that the metal oxide species inhibited the crystalline phase transition of TiO2 from anatase to rutile. Furthermore, the success of the hybridization of other metal oxides (except for TiO2) indicated the usefulness of the organogel route as one of the fabrication methods of metal oxide nanotubes. View Full-Text
Keywords: low-molecular-weight gelator; titanium dioxide; nanofiber; nanotube; supramolecular chemistry; sol-gel polymerization; template-synthesis low-molecular-weight gelator; titanium dioxide; nanofiber; nanotube; supramolecular chemistry; sol-gel polymerization; template-synthesis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Suzuki, M.; Tanaka, K.; Kato, Y.; Hanabusa, K. Metal Oxide/TiO2 Hybrid Nanotubes Fabricated through the Organogel Route. Gels 2017, 3, 24.

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