Department of Chemistry, Rice University, Houston, Texas 77251, USA.
Langmuir. 2011 Dec 20;27(24):14748-56. doi: 10.1021/la202918n. Epub 2011 Nov 17.
Surface-enhanced Raman spectroscopy (SERS) of gold nanorods in cetyltrimethylammonium bromide solution has been used to analyze the interfacial surfactant structure based on the distance-dependent electromagnetic enhancement. The spectra were consistent with a surfactant bilayer oriented normal to the surface. As the surfactant concentration was reduced, a structural transition in the surfactant layer was observed through a sudden increase in the signal from the alkane chains. The structural transition was shown to influence the displacement of the surfactant layer by thiolated poly(ethylene glycol). The monodisperse and thoroughly characterized gold nanorod samples yield consistent enhancement factors that were compared to electromagnetic simulations.
表面增强拉曼光谱（SERS）的金纳米棒在溴化十六烷基三甲铵溶液中已被用于分析基于距离的电磁场增强的界面表面活性剂结构。光谱与表面垂直定向的表面活性剂双层一致。随着表面活性剂浓度的降低，通过烷链信号的突然增加观察到表面活性剂层的结构转变。结构转变被证明会影响巯基聚（乙二醇）对表面活性剂层的取代。单分散且经过充分表征的金纳米棒样品产生一致的增强因子，可与电磁模拟进行比较。
