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.

在该项目的适当过程中，我们研究了基于表面修饰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致密堆积的制备，旨在人工设计量子效应晶体的研究结果如下： 1）采用胶体化学技术在水中大规模合成纳米金颗粒。以巯基琥珀酸为原料，建立了0.1～1g的规模。（MSA）作为表面改性剂。2）金纳米颗粒晶体的高产率合成。基于DLVO理论开发了空气/水界面的独立结晶。3）纳米颗粒晶体的光学吸收光谱。我们观察到了特征光谱在金纳米粒子晶体的多晶薄膜中，这与孤立粒子或粉末样品的随机堆积的典型溶液光谱不同，在孤立粒子中观察到的位于 520 nm 处的宽表面等离子体带。锐化并转移到较低能量侧，表明与花青染料的激子或 J 带类似，具有强烈的颗粒间相互作用。4）金纳米颗粒晶体的 STM 观察。STM 技术应用于颗粒晶体，表明金纳米颗粒的表面被致密地覆盖单层MSA。5）金纳米颗粒晶体的结构评估。将XRD和TED方法应用于良好的金纳米颗粒晶体，揭示了hcp致密堆积结构。6）化学修饰使用吡啶羧酸对表面MSA分子进行酯化反应，得到金纳米颗粒的单层膜。