Size controlled synthesis of Ag and Cu nanocrystals in F-AOT/n-butanol/SC CO₂ microemulsions

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• 作者：Zameer Shervani ; Yutaka Ikushima ; Toshirou Yokoyama ; Masahiro Sato ; Yukiya Hakuta ; Nagase Takako ; Hironobu Kunieda ; Kenji Aramaki
• 关键词：SC CO₂ ; F-AOT ; Microemulsions ; Nanoparticles ; High pressure
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2007
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：15 August 2007
• 卷：303
• 期：3
• 页码：159-165
• 文件大小：1019 K

摘要

The application of di-HCF6 (sodium bis(1H,1H,7H,dodecafluoroheptyl)sulfosuccinate)/n-butanol/SC CO₂ microemulsion was tested for the synthesis of Ag and Cu nanocrystals of controlled size. The aqueous core of microemulsion droplet acted as a nanoreactor and surfactant monolayer stabilized the synthesized nanoparticles. The size of the particles was tuned by adjusting the water content (W₀, the molar ratio of water-to-surfactant) of microemulsions. Transmission electron microscopy (TEM) revealed that the average diameter of Ag particles increased from 3.0 nm (σ = 1.1) to 5.2 nm (σ = 0.86) by raising the water content of microemulsion from W₀ = 10 to 15, whereas raising the water content of microemulsion from W₀ = 5 to 15 increased the size of Cu nanoparticles from 7.5 nm (σ = 2.42) to 15.2 nm (σ = 5.47). Surface plasmon absorption spectrum recorded for synthesized Ag nanocrystal in microemulsion exhibited an increase in the intensity and blue-shifted absorption maximum on increasing the water content of microemulsion from W₀ = 10 to 15 which are the characteristics of increasing the size of nanoparticles.