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Preparation of Gold Cluster Crystals and Their Electronic State

金簇晶的制备及其电子态

基本信息

批准号：
15087210
负责人：
KIMURA Keisaku
金额：
$ 17.41万
依托单位：
University of Hyogo (2004-2006)Himeji Institute of Technology (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15087210/
关键词：
Nanoparticle Quantum Size Effect Nanoparticle Crystal Self-Assembled Monolaver Film Self-Assembled Superlattice Gold Cluster Quantum Crystal Superlattice Structure 自己集積膜

项目摘要

The main object of this research is 1) To prepare gold nanoparticles in the size range from 1 to 3 nm, which is in the quantum size regime,2) To crystallize these nanoparticles to realize macroscopically quantum size effect and to clarify its magnetic properties. With our technique, it is possible to regulate the core size of a single nanoparticle, the thickness of insulator barrier height, interaction among substituted residues. Hence it is possible to prepare a new type superstructures different from those manufactured by conventional deposition techniques because of a new approach. We can expect a characteristic feature such as a magic number in cluster molecules whose sizes are much smaller than a nanoparticle.. Through this project, we also expect to get detailed solid state properties in these cluster materials.We have applied a vapor diffusion method to prepare a quality particle crystal of mercaptosuccinic acid modified silver particles as an test material to demonstrate the ef … More fectiveness of this method. Even starting wide size distribution with 40% size width, we have succeeded in preparing a good particle crystal without size separation. We are now planning to apply this method to get a gold nanoparticle crystal. We have started measurement of transport properties of deposited film of gold nanoparticle to characterize its electronic properties from room temperature down to 20 K. The deposited film revealed characteristic temperature dependence in the conductivity showing the metallic character with slightly small temperature coefficient. We have also found that the same film was capable to measure optical absorption experiment that means this film is somewhat transparent even though the thickness of the film. A more comprehensive experiment is now under going.A particle crystal that has pentagonal symmetry was obtained with acetyl GTR ligand. The crystal size is in the order of micron meter. This is a unique substance in a group of superlattice of nanoparticles. The next target of our project is to crystallize more small particles in the regime of cluster with a sharp size distribution as if it were molecular materials. To realize this object, we are now developing a new technique which uses less than a milligram sample powders to get crystal and crystallize within a capillary. Less

本研究的主要目的是：1）制备尺寸在1 ~ 3 nm范围内的量子尺寸金纳米粒子; 2）将金纳米粒子晶化，实现宏观量子尺寸效应，并阐明其磁性。利用我们的技术，可以调节单个纳米颗粒的核尺寸、绝缘体势垒高度的厚度、取代残基之间的相互作用。因此，它是可能的，因为一种新的方法，以制备一种新型的上层建筑不同于那些由传统的沉积技术制造。我们可以期待一个特征，例如在尺寸比纳米颗粒小得多的簇分子中的幻数。通过本课题的研究，我们也期望得到这些团簇材料的详细的固态性质，我们采用气相扩散法制备了一种高质量的巯基丁二酸修饰的银颗粒晶体作为测试材料，以证明其有效性 ...更多信息这种方法的有效性。即使从40%粒度宽度的宽粒度分布开始，我们也成功地制备了没有粒度分离的良好颗粒晶体。我们现在正计划应用这种方法来获得金纳米颗粒晶体。我们已经开始测量金纳米颗粒沉积膜的输运性质，以表征其从室温到20 K的电子性质。沉积的膜显示出特征的温度依赖性的电导率显示金属字符与稍小的温度系数。我们还发现，相同的膜能够测量光学吸收实验，这意味着即使膜的厚度，该膜也是有些透明的。更全面的实验正在进行中，以乙酰基GTR为配体，获得了具有五角对称性的颗粒晶体。晶体尺寸在微米量级。这是一组纳米粒子超晶格中的独特物质。我们的下一个目标是结晶更多的小颗粒在集团制度与尖锐的尺寸分布，如果它是分子材料。为了实现这一目标，我们正在开发一种新的技术，该技术使用不到一毫克的样品粉末在毛细管中获得晶体并结晶。少