Anion and cation effects on the size control of Au nanoparticles prepared by sputter deposition in imidazolium-based ionic liquids
Anion and cation effects on the size control of Au nanoparticles prepared by sputter deposition in imidazolium-based ionic liquids
复制标题
DOI：
10.1039/c5cp04123f
复制
发表时间：
2016-01-28
影响因子：
3.3
通讯作者：
Nishikawa, Keiko
中科院分区：
文献类型：
--
作者：
Hatakeyama, Yoshikiyo;Judai, Ken;Nishikawa, Keiko
在离子液体（IL）捕获介质中溅射沉积金属是制备纳米颗粒的一种简单而优雅的方法，无需任何化学反应。虽然已经有一些关于用这种方法制备的金纳米颗粒（AuNPs）的尺寸决定因素的报道，但与所使用的IL类型有关的影响尚未得到明确的阐明。这是因为有一些复杂的因素，其中一些已经被我们之前的系统研究揭示了。在本研究中，我们在九种咪唑基IL中制备了AuNPs，在保持其他因素不变的情况下，考察了所涉及阴离子类型、阳离子烷基链长度和每种IL的制备温度对其大小的决定作用。对于大多数捕获介质il， aunp的大小随着温度的升高而增加。在含有不同类型阴离子的il中制备的AuNPs表现出明显不同的粒径和温度依赖性。相反，烷基链被认为是只在较高的制备温度下起作用的二级稳定剂。我们得出结论，用这种方法制备的aunp的大小可能是由喷射出的Au原子的碰撞频率和在aunp周围形成第一配位壳的阴离子的稳定能力之间的竞争决定的。AuNP的大小与阴离子的体积密切相关。
The sputter deposition of metals in an ionic liquid (IL) capture medium is a simple and elegant method for preparing nanoparticles without any chemical reaction. Although there have been some reports on the size determination factors for Au nanoparticles (AuNPs) prepared using this method, the effects with respect to the type of IL used have not been clearly elucidated. This is because there are some complicating factors, some of which have been revealed by our previous systematic studies. In the present study, we prepare AuNPs in nine types of imidazolium-based IL to examine the size determination effects of the type of anion involved, the length of the alkyl chain of the cation, and the preparation temperature for each IL, while keeping other factors constant. For most of the capture media ILs, the sizes of the AuNPs increase with an increase in temperature. The AuNPs prepared in ILs containing different types of anions exhibit distinctly different particle sizes and temperature dependences. Conversely, the alkyl chain is regarded as a secondary stabilizer that works only at higher preparation temperatures. We conclude that the sizes of AuNPs prepared by this method may be determined by the competition between the collision frequency of the ejected Au atoms and the stabilizing capability of the anions that form the first coordination shell around the AuNPs. The AuNP sizes are closely related to the volume of anions.