锐钛矿
粒径
纳米颗粒
材料科学
纳米技术
金红石
带隙
纳米晶
化学物理
树枝状大分子
蓝移
价(化学)
离子
模板
金属
化学
光电子学
物理化学
有机化学
催化作用
光致发光
高分子化学
冶金
光催化
作者
Norifusa Satoh,Toshio Nakashima,Kenta Kamikura,Kimihisa Yamamoto
摘要
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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