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Physicochemical properties of gold nanoparticle crystals

金纳米颗粒晶体的物理化学性质

基本信息

批准号：
13440212
负责人：
KIMURA Keisaku
金额：
$ 9.54万
依托单位：
Himeji Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

In due course of this project, we have studied the preparation of a nano-quantum crystal based upon self-assembling of surface modified gold nanoparticles, different from so-called particle crystal formation or the preparation of dense packing of nanoparticles, aiming the artificially designed quantum effect crystals. The results are classified as follows.1) Large scale synthesis of gold nanoparticles in water by colloidal chemistry technique.The scale of 0.1〜1g quantity was established by using mercaptosuccinic acid (MSA) as a surface modifier.2) High yield synthesis of gold nanoparticle crystals.Free standing crystallization at an air/water interface was developed based on DLVO theory.3) Optical absorption spectrum of nanoparticle crystals.We have observed a characteristic optical spectra in polycrystalline film of gold nanoparticle crystals, which differed from solution spectra typical of isolated particles or random packing of powdered samples. The broad surface plasmon band located at 520 nm observed in isolated particles was sharpened and shifted to lower energy side suggesting strong interparticle interaction likewise of exciton or J-band of cyanine dyes.4) STM observation of gold nanoparticle crystals.STM technique was applied to the particle crystal revealing that the surface of gold nanoparticles are densely covered with monolayer MSA.5) Structural evaluation of gold nanoparticle crystals.XRD and TED method are applied to a good crystal of gold nanoparticles revealing hcp densely packed structure.6) Chemical modification of surface modifier molecules.Esterification reaction was taken place against surface MSA molecules using pyridine carboxylic acid giving monolayer film of gold nanoparticles.

在本项目的适当过程中，我们针对人工设计的量子效应晶体，研究了基于表面修饰的金纳米颗粒自组装的纳米量子晶体的制备，不同于所谓的颗粒晶体形成或纳米颗粒的致密堆积的制备。主要研究结果如下：1）利用胶体化学技术，在水中大规模合成了金纳米粒子，并以巯基丁二酸（MSA）为表面改性剂，建立了0.1 × 1g的规模; 2）高收率合成了金纳米粒子晶体，并基于DLVO理论，发展了在空气/水界面上的自支撑结晶; 3）纳米颗粒晶体的光吸收光谱：我们观察到的特征光谱的多晶薄膜的金纳米颗粒晶体，这不同于典型的孤立的颗粒或随机包装的粉末样品的溶液光谱。在孤立粒子中观察到的位于520 nm处的宽表面等离子体激元带被锐化并向低能侧移动，表明类似于菁染料的激子或J带的强粒子间相互作用。4）金纳米粒子晶体的STM观察将STM技术应用于粒子晶体，揭示金纳米粒子表面被单层MSA致密地覆盖。5）金纳米粒子晶体的结构评价：采用XRD和TED方法对金纳米粒子进行了表征，揭示了金纳米粒子的hcp密排结构。6）表面改性剂分子的化学修饰：用吡啶羧酸对表面的MSA分子进行酯化反应，得到单层金纳米粒子膜。