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【资源】Japanese team create next-gen DVD material 氧化钛制作晶体
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A Japanese research team has found a material that could be used to make a low-price disc with data storage capacity thousands of times greater than a DVD. The material transforms from a black-colour metal state that conducts electricity into a brown semiconductor when hit by light, according to Professor Shin-ichi Ohkoshi, of the University of Tokyo. The material, a new crystal form of titanium oxide, can switch back and forth between the metal and semiconductor states at room temperature when exposed to light, creating an effective on-off function for data storage. It is "promising as a material for a next-generation optical storage device," says Ohkoshi, who is lead author of the study appearing in the journal Nature Chemistry. A material that changes colour with light can be used in storage devices as colours reflect light differently to contain different information. His team has succeeded in creating the material in particles measuring between 5 and 20 nanometres in diameter. If the smallest particle is used, the new disc could hold more than 1000 times as much information as a Blu-ray disc, provided that matching data-writing and reading equipment are developed. A single-layer Blu-ray disc can hold five times as much data as a conventional DVD. The disc would also be cheaper. Titanium oxide's market price is about one-hundredth of the rare alloy germanium-antimony-tellurium, which is currently used in rewritable Blu-ray discs and DVDs, says Ohkoshi. "You don't have to worry about procuring rare metals. Titanium oxide is cheap and safe, already being used in many products ranging from face powder to white paint," he says. Ohkoshi says it is not known when a disc with this material would be manufactured and put to practical use, adding that he would start talks with private-sector companies for commercialisation http://www.abc.net.au/science/ar ... 18.htm?site=science [ Last edited by AITsong on 2010-5-25 at 18:25 ] |
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