Formation of Wormlike Aggregates of Fluorocarbon-Hydrocarbon Hybrid Surfactant by Langmuir-Blodgett Transfer and Alignment of Gold Nanoparticles

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• 作者：Yukishige Kondo ; Hiroshi Fukuoka ; Shuichi Nakano ; Kohei Hayashi ; Tatsuya Tsukagoshi ; Mutsuyoshi Matsumoto ; Norio Yoshino
• 刊名：Langmuir
• 出版年：2007
• 出版时间：May 22, 2007
• 年：2007
• 卷：23
• 期：11
• 页码：5857 - 5860
• 全文大小：278K
• 年卷期：v.23,no.11(May 22, 2007)
• ISSN：1520-5827

文摘

A novel anionic fluorocarbon-hydrocarbon hybrid surfactant (SS-Hyb^-Na⁺) with a disulfide group has been synthesizedfrom 11-bromo-1-undecanal and perfluorohexylethyl iodide via three steps. The Langmuir-Blodgett (LB) transferof the 1:100 (mol/mol) mixed monolayer of SS-Hyb^-Na⁺ and stearyl alcohol (C₁₈OH) formed on an aqueous solutioncontaining a cationic polymer, poly(diallyldimethylammonium chloride) (PDDA⁺Cl^-) onto a hydrophobic siliconwafer yields the formation of wormlike aggregates consisting of SS-Hyb^-/PDDA⁺ polyion complexes. It is foundthat the aggregates align along the withdrawal direction of the wafer substrate. When the wafer on which the wormlikeaggregates exist is immersed into the dispersion of gold nanoparticles (Au NPs) prepared by the citrate reductionmethod, Au NPs align along the wormlike structures. Even though the surface of the wafer is placed either verticalor parallel to the monolayer compression direction during the LB transfer, the one-dimensional (1D) array of Au NPsis observed along the withdrawal direction of the wafer. This indicates that the wormlike aggregates of SS-Hyb^-/PDDA⁺ complexes are aligned during the LB transfer, and the aligned aggregates behave as a scaffold in the 1D arrayof Au NPs.