Synthesis of a metal oxide with a room-temperature photoreversible phase transition
| Autor: | Shin-ichi Ohkoshi, Tomoyuki Matsuda, Hiroko Tokoro, Kazuhito Hashimoto, Yoshihide Tsunobuchi, Asuka Namai, Fumiyoshi Hakoe |
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| Rok vydání: | 2010 |
| Předmět: |
Titanium
Phase transition 3D optical data storage General Chemical Engineering Molecular Conformation Temperature Oxide Oxides General Chemistry Optical storage Crystallography X-Ray Photochemical Processes Phase Transition Condensed Matter::Materials Science chemistry.chemical_compound Photochromism chemistry Nanocrystal Phase (matter) Nanoparticles Quantum Theory Thermodynamics Organic chemistry Physical chemistry Laser power scaling |
| Zdroj: | Nature Chemistry. 2:539-545 |
| ISSN: | 1755-4349 1755-4330 |
| DOI: | 10.1038/nchem.670 |
| Popis: | Photoinduced phase-transition materials, such as chalcogenides, spin-crossover complexes, photochromic organic compounds and charge-transfer materials, are of interest because of their application to optical data storage. Here we report a photoreversible metal-semiconductor phase transition at room temperature with a unique phase of Ti(3)O(5), lambda-Ti(3)O(5). lambda-Ti(3)O(5) nanocrystals are made by the combination of reverse-micelle and sol-gel techniques. Thermodynamic analysis suggests that the photoinduced phase transition originates from a particular state of lambda-Ti(3)O(5) trapped at a thermodynamic local energy minimum. Light irradiation causes reversible switching between this trapped state (lambda-Ti(3)O(5)) and the other energy-minimum state (beta-Ti(3)O(5)), both of which are persistent phases. This is the first demonstration of a photorewritable phenomenon at room temperature in a metal oxide. lambda-Ti(3)O(5) satisfies the operation conditions required for a practical optical storage system (operational temperature, writing data by short wavelength light and the appropriate threshold laser power). |
| Databáze: | OpenAIRE |
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