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Shigenori FUJIKAWA, Special Postdoctoral Researcher
Topochemical Design Laboratory, Frontier Research System,.The institute of Physical and Chemical Research (RIKEN)
Surface fabrication of 3D-structured metal oxide ultrathin film templated by nanostructures on solid substrates.
I am currently working on surface fabrication of 3D-structured metal oxide ultrathin film templated by nanostructures on solid substrates. Our approach is based on positive copy of nanostructures on solid substrates, and consists of 3 steps (Figure 1). Ultrathin layers of metal oxide cover the surface of nano templates on solid substrates, and its template is finally removed. As-prepared thin film has a three dimensional structure which reflects the shape of the original template (positive copy).
As a first trial, the assembly of polystyrene nanoparticles (PS particle, diameter: 100 nm) on solid substrates were used as a template. The PS particles were covered with ultrathin titania films using the surface sol-gel process, and were then removed to form the titania capsules (diameter = 60-80 nm). The titania capsules were shrunk during removal of the inner template particles. At the same time, the titania tubes were produced as a result of elongation of the interconnecting titania layer between neighboring particles. The hexagonally interconnected titania hollow structures were produced from hexagonally packed-particles template (Figure 2). This result indicates that more complex patterns would lead to elaborate nano-architectures. Now we are using more complex nanostructures on solid substrates as a template.
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Fig. 1
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Preparation of titania thin films on polystyrene particles and removal of template particles to form an interconnected titania capsules.
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Fig. 2
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SEM observation of hexagonally interconnected titania nano-capsules prepared from a polystyrene particle template.
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Relevant papers
- Fujikawa, S. & Kunitake, T.
Surface fabrication of interconnected hollow spheres of nm-thick titania shell
Chem. Lett. 1134 (2002).
- Fujikawa, S. & Kunitake, T.
Formation of interconnected titania nano-capsules on solid substrate
IUPAC-PC2002 Preprints 351 (2002).
- Fujikawa, S. & Kunitake, T.
Surface fabrication of hollow nano-architechtures of ultrathin titania layer from assembled latex particles and tobacco mosaic viruses as templates
Langmuir (2003) in press.
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