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Chemical Transformation Networks using Ultra-small Particles

使用超小颗粒的化学转化网络

基本信息

批准号：
16204019
负责人：
KASUYA Atsuo
金额：
$ 31.78万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Nanoparticles in 1 nm dimension consisting of tens to thousands of atoms exhibit materials properties sensitively dependent on the number of constituent atoms, in contrast to those over a few nm which are regarded essentially as the bulk. This project investigates two or three dimensional networks of these ultra-small nanoparticles inducing detection, conduction, decomposition, transformation, storage of electrons, atoms, molecules and ions.The research is divided into 1.synthesis of ultra-small particles of high functionalities, 2.linking them into networks, and 3.evaluating their device characteristics. The special attention was focused on producing the smallest particles of practically useful II-VI semiconducting compounds, succeeding in finding atomically precise and perfectly monosized 1 nm particles of (CdSe)_n. The number of constituent atoms is less than a hundred and is small enough that the particle behaves like a molecule to be linked or assembled under atomic scale and prec … More ision. They exhibit functional devices realized by and based on the properties arising from special atomic arrangements not achieved by bulk crystalline structures, leading to a new approach in nanometer science and technology.Ultra-small particles of (CdSe)_n were synthesized with n= 13,34,48,60.... Such small particles exhibit their stabilities extremely sensitive to the number of constituent atoms, n, so as to be selectively grown only at these n's.Networks with these particles were produced not only by simple array formation but also by their liking with organic polymers to form two and three dimensional arrangements.These 1nm particles are further functionalized by surface modification with such as trioctylphosphine (TOP) to yield extremely high luminescence efficiency comparable to rhodamines of commercial organic dyes.These functionalities are realized by our atomically precise synthesis and characterization made possible because of their molecular nature, proven as a desirable approach in the nanoscience and technology. Less

由数万至数千个原子组成的1 nm尺寸的纳米颗粒表现出敏感地依赖于组成原子的数量的材料性质，与基本上被视为本体的几nm以上的纳米颗粒形成对比。本计画主要研究这些超小奈米粒子的二维或三维网络，诱导电子、原子、分子及离子的侦测、传导、分解、转换、储存等功能，研究内容分为：1.高功能性超小奈米粒子的合成，2.将其连结成网络，3.评估其元件特性。特别注意力集中在生产实际有用的II-VI族半导体化合物的最小颗粒，成功地发现原子精确和完美的单尺寸1 nm颗粒的（CdSe）_n。组成粒子的原子数小于100，小到足以使粒子像分子一样在原子尺度下连接或组装， ...更多信息视觉。它们显示了基于特殊原子排列所产生的性质而实现的功能器件，为纳米科学和技术开辟了一条新的途径。这样的小颗粒表现出它们的稳定性对组成原子的数目n极其敏感，这些纳米粒子不仅可以通过简单的阵列形成，而且可以通过与有机聚合物的结合形成二维和三维的排列，这些纳米粒子可以通过表面修饰如三辛基膦（TOP）来进一步功能化。这些功能是通过我们原子级精确的合成和表征实现的，因为它们的分子性质，被证明是纳米科学和技术的理想方法。少