湿化学法一步合成高有序L1_(0)-AuCu纳米粒子

Facile wet chemical synthesis of highly ordered L1_(0)-AuCu nanoparticles

利用湿化学法成功一步合成出高品质L1_(0)-AuCu纳米粒子。研究了合成工艺对AuCu纳米粒子的形貌、成分和有序度的影响。研究表明:随着温度的升高,AuCu纳米粒子结构将发生有序转变。当温度高于320℃时,AuCu纳米粒子开始转变为L1_(0)结构。AuCu纳米粒子中前驱体的添加比例也会影响其形貌和有序度。当金和铜的摩尔比x由小增大时,AuCu纳米粒子的分散度变差,L1_(0)结构的特征峰强度呈现出先增强后减弱的趋势。在合成温度为340℃,金铜摩尔比x为1.11时,成功获得了粒径小、有序度高、分散性好的AuCu纳米粒子。该制备方法工艺简单,可控性强,为直接合成高品质AuCu有序化纳米粒子提供了新思路。

High quality L1_(0)-AuCu nanoparticles were synthesized by a facile wet chemical method. The impacts of the preparation process on the morphology, composition and ordering degree of L1_(0)-AuCu nanoparticles were investigated. These results go beyond previous reports, showing that the structure of AuCu nanoparticles will undergo ordering transformation with the increase of temperature. When the temperature is higher than 320 ℃, AuCu nanoparticles begin to transform into L1_(0)structure. The addition amount of precursor also affects the morphology and ordering degree of AuCu nanoparticles. When Au/Cu increases slightly, the dispersion of AuCu nanoparticles decreases, and the strength of characteristic peak of L1_(0)structure increases first and then decreases. AuCu nanoparticles with small size, high ordering degree and good dispersity were successfully synthesized at 340 ℃ and the x ratio of 1.11. This method is expected to provide a new insight for directly preparing high-quality AuCu nanoparticles with high ordering degree and small size.