2008年3月24日月曜日
2008年3月22日土曜日
2008年2月4日月曜日
2008年2月3日日曜日
Quantum size effect in TiO2 nanoparticles prepared by finely controlled metal assembly on dendrimer templates
N. Satoh, T. Nakashima, K. Kamikura, K. Yamamoto
Nature Nanotechnol. 2008, 3, 106-111.
The use of dendrimer templates to make metal-based nanoparticles of controlled size has attracted much interest. These highly branched macromolecules have well-defined structures that enable them to bind metal ions to generate precursors that can be converted into nanoparticles. We describe the sub-nanometre size control of both anatase and rutile forms of TiO2 particles with phenylazomethine dendrimers, leading to samples with very narrow size distributions. Such fine tuning is possible because both the number and location of metal ions can be precisely controlled in these templates. Quantum size effects are observed in the particles, and the energy gap between the conduction and valence bands exhibits a blueshift with decreasing particle size and is dependent on the crystal form of the material. The dependency of the bandgap energy on these factors is explained using a semi-empirical effective mass approximation.
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2008年1月23日水曜日
2007年12月7日金曜日
PPC10にてYoung Scientist Poster Awardを受賞
当研究室の越智庸介君(M2)が神戸で行われた国際学会PPC-10 (10th Pacific Polymer Conference)にてYoung Scientist Poster Awardを受賞しました。
2007年10月13日土曜日
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