Preparation of Helical Transition-Metal Oxide Tubes Using Organogelators as Structure-Directing Agents

Abstract

We prepared novel transition-metal (Ti, Ta, V) oxide fibers with chiral, helical, and nanotubular structures. The nanostructured metal oxide materials were provided by the sol-gel polymerization of metal alkoxides using chiral self-assemblies of organogelators as structure-directing agents. The chiral structures of the metal oxide fibers can be created by the formation of chiral self-assemblies constructed by organogelators and the transcription of the organogel superstructure into metal oxides.

Study of Titanium Dioxide Nanotube Array for the Application in Dye-Sensitized Solar Cells

“…It also provides excellent electron pathways for charge transfer between interfaces. TiO 2 nanostructures can be synthesized by various methods like sol gel transcription using organogelator template [6]- [7], seeded growth mechanism [8], hydrothermal techniques [9]. Among these processes, the electrochemical anodization of titanium in fluorinated electrolytes is a simple method to synthesize porous highly vertically ordered structures with high aspect ratios.…”

Fabrication of Helical Mesoporous Silica Nanostructures Using Gelators and the Mixtures with CTAC

“…Up to now, the helical structures in organogel fibers [9] and self-assemblies of lipids [10] have been successfully transcribed into inorganic silica and titania. Twisted ribbons [3b], singlestranded [9,11], double [12], and multiple helical [13] structures have been achieved using the template method. Moreover, inner-helical mesoporous nanofibers have been successfully prepared using chiral gelator [3a].…”

Photocatalytic Activity of Titanium Oxide Nano-Networks Fabricated through Organogel Route Using L-Isoleucine-Based Gelator

“…The nanostructured TiO2 (nano-networks and nanoparticles) were fabricated according to the literature [33][34][35]. The typical procedure was as follows.…”

“…Because the low-molecular-weight gelators produce various nanostructures such as nanofibers, nanoribbons, nanorods, and nanoparticles in the organogels, many lowmolecular-weight gelators have been recognized as one of the good organic templates [24][25][26][27][28][29][30][31][32]. We reported the fabrication of nanostructured TiO2 using low-molecularweight gelators ; e.g., TiO2 nanotubes, nanoparticles and helical TiO2 nanotubes [33][34][35]. In this letter, we describe the fabrication of TiO2 nano-networks using the Lisoleucine-based gelator (Fig.…”