Influence of the Counterions of Cetyltrimetylammonium Salts on the Surfactant Adsorption onto Gold Surfaces and the Formation of Gold Nanoparticles
Influence of the Counterions of Cetyltrimetylammonium Salts on the Surfactant Adsorption onto Gold Surfaces and the Formation of Gold Nanoparticles
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DOI：
10.1021/jp066963n
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发表时间：
2007-01
影响因子：
3.7
通讯作者：
H. Kawasaki;Kouhei Nishimura;R. Arakawa
中科院分区：
文献类型：
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作者：
H. Kawasaki;Kouhei Nishimura;R. Arakawa
我们报道了反离子物种对十六烷基三甲基铵盐(C16TAX)在金表面的吸附以及随后在C16TAX表面活性剂溶液中形成金纳米颗粒的影响。用石英晶体微天平(QCM)和原子力显微镜(AFM)研究了表面活性物质在金表面的吸附。本研究考察的反离子物种(X)如下：X=Br2-、Cl2-、NO3-、F-、OH-和SO42-。C16TAX在金表面的吸附依赖于C16TAX的反离子物种。QCM的频率漂移顺序为：X=Br->；NO3-≈SO42->；Cl->；F->；使用2，2‘-亚氨基二乙醇作为温和的还原剂，在C16TAX的表面活性剂溶液中化学还原金(III)，生成各向异性的金纳米颗粒，这取决于表面活性剂的反离子。...‘>表面高亲和力吸附生成各向异性的金纳米颗粒，而在弱吸附条件下，只得到球形的金纳米颗粒.
We report the effects of counterion species on the adsorption of cetyltrimetylammonium salts (C16TAX) onto gold surfaces and the subsequent formation of gold nanoparticles in the C16TAX surfactant solution. The surfactant adsorption onto gold surfaces was examined by using quartz crystal microbalance (QCM) and atomic force microscopy (AFM). The counterion species (X) examined in this study were as follows: X = Br-, Cl-, NO3-, F-, OH-, and SO42-. The adsorption onto the gold surface depended on the counterion species of C16TAXthe frequency shift of QCM decreased in the following order: X = Br- > NO3- ≈ SO42- > Cl- > F- > OH-. The chemical reduction of gold(III) in the surfactant solutions of C16TAX with use of 2,2‘-iminodiethanol as a mild reducing agent produced anisotropic gold nanoparticles, depending on the surfactant counterion. The high-affinity adsorption of Br-, NO3-, and Cl- on gold surfaces produced anisotropic gold nanoparticles, while only spherical gold nanoparticles were obtained for weakly...