Qi L, Ma J, Shen J
Department of Chemistry, Peking University, Beijing, 100871, People's Republic of China
J Colloid Interface Sci. 1997 Feb 15;186(2):498-500. doi: 10.1006/jcis.1996.4647.
Synthesis of well-dispersed copper nanoparticles was achieved by reduction of aqueous copper chloride solution using NaBH4 in the nonionic water-in-oil (w/o) microemulsions formed by Triton X-100, n-hexanol, cyclohexane, and water. It has been shown that instead of copper oxide produced in aqueous solution, metallic copper particles are formed in w/o microemulsions because of the high local copper concentration in water pools of the microemulsions, indicating the advantage offered by w/o microemulsions over aqueous phases. The absorption spectrum of the colloidal copper particles obtained in microemulsions does not exhibit the plasmon peak characteristic of the Cu surface. It is conceivable that the lack of the plasmon absorption band is attributed to the formation of a CuCl monolayer on the copper particles.
通过在由 Triton X - 100、正己醇、环己烷和水形成的非离子油包水（w/o）微乳液中用 NaBH₄ 还原氯化铜水溶液，实现了分散良好的铜纳米颗粒的合成。研究表明，由于微乳液水池中局部铜浓度较高，在 w/o 微乳液中形成的是金属铜颗粒，而不是在水溶液中生成的氧化铜，这表明 w/o 微乳液相对于水相具有优势。在微乳液中获得的胶体铜颗粒的吸收光谱未表现出铜表面的等离子体峰特征。可以想象，等离子体吸收带的缺失归因于铜颗粒上形成了 CuCl 单层。
