单分子层表面修饰铜纳米颗粒的制备方法

Synthesis of copper nanoparticles surface-modified with self-assembled monolayers

在乙醇-水体系中,以N,N′-二丁基二硫代氨基甲酸烷基酯为修饰剂,在NaOH和十六烷基三甲基溴化铵(CTAB)存在下,用硼氢化钠还原硫酸铜,制备了粒径、形貌可控的单分子层表面修饰铜纳米颗粒。利用FT-IR、TEM、XPS、UV-Vis等手段对铜纳米颗粒进行了表征。结果表明:修饰剂对铜纳米颗粒的粒径大小、分布、形貌有一定影响,N,N′-二丁基二硫代氨基甲酸烷基酯能在铜纳米颗粒表面形成较紧密的吸附层,有效提高了铜纳米颗粒的稳定性和分散性,并且随着修饰剂烷基链的增长,铜纳米颗粒的粒径略有增大。

Size-and shape-controlled phase surface-modified copper nanoparticles were synthesized from copper sulfate pentahydrate with NaBH4 as the reductant and N, N＇-dibutyl-amino-dithioearbamate-R（R=alkyl） as modifiers at room temperature in ethanol-aqueous solution system in the presence of NaOH and CTAB. The prepared copper nanoparticles were characterized by FTIR, TEM, XPS, UV-Vis. The presence of modifiers was obvious in the control of particle sizes, size distributions, and shapes. The result shows that the N, N1-dibutyl-amino-dithiocarbamates-R can lead to the formation compacted absorbed layer, which can improve the stability and dispersibility and help achieve a small radius of nanocopper particles. And the radius of the nanocopper particles increases with a gain in the alkyl chain.