Size evolution of alkanethiol-protected gold nanoparticles by heat treatment in the solid state
Size evolution of alkanethiol-protected gold nanoparticles by heat treatment in the solid state
复制标题
DOI：
10.1021/jp026920g
复制
发表时间：
2003-03-27
影响因子：
3.3
通讯作者：
Miyake, M
中科院分区：
文献类型：
--
作者：
Shimizu, T;Teranishi, T;Miyake, M
提出了一种通过固态热处理来控制烷硫醇保护的金纳米颗粒尺寸的简单方法。通过在空气中加热到150-250℃，Brust的两相法制备的AN纳米粒子的平均直径(类似于1.5 nm)演化到3.4-9.7 nm。在纳米粒子生长过程前，去除制备纳米粒子时作为相转移剂的四辛基溴化铵(TOAB)，没有观察到纳米粒子的均匀生长。对热处理前后Au纳米粒子的晶体结构和纳米粒子表面的烷硫醇配体结构进行了表征。在热力学模型的基础上，讨论了其尺寸演化机理。热处理后的纳米粒子很容易形成具有六方堆积结构的自组装2D超晶格，其中具有全反式构象的烷基硫醇保护剂可以相互渗透。
A simple method is proposed to control the size of alkanethiol-protected Au nanoparticles by heat treatment in the solid state. The mean diameter of the An nanoparticles prepared by Brust's two-phase method (similar to1.5 nm) was evolved to 3.4-9.7 nm by heating to 150-250 degreesC in air. The uniform growth of nanoparticles was not observed when tetraoctylammonium bromide (TOAB), which was used as a phase-transfer agent during the preparation of An nanoparticles, was removed before the particle growth process. The crystal structures of Au nanoparticles and alkanethiol ligand structures on An nanoparticles were characterized before and after the heat treatment. The size-evolution mechanism was discussed on the basis of the thermodynamic model. The heat-treated An nanoparticles easily formed self-assembled 2D superlattices with hexagonal packing, where the alkanethiol protective agents with an all-trans conformation were estimated to interpenetrate each other.