Structural Transition in the Surfactant Layer that Surrounds Gold Nanorods as Observed by Analytical Surface-Enhanced Raman Spectroscopy

被引：94

作者：

Lee, Seunghyun ^{[1
]}

Anderson, Lindsey J. E. ^{[2
,3
]}

Payne, Courtney M. ^{[1
,3
]}

Hafner, Jason H. ^{[1
,2
,3
]}

机构：

[1] Rice Univ, Dept Chem, Houston, TX 77251 USA

[2] Rice Univ, Dept Phys & Astron, Houston, TX 77251 USA

[3] Rice Univ, Lab Nanophoton, Houston, TX 77251 USA

来源：

LANGMUIR | 2011年 / 27卷 / 24期

基金：

美国国家科学基金会;

关键词：

SILICA-WATER INTERFACE; SEED-MEDIATED GROWTH; PLASMON RESONANCE; CATIONIC SURFACTANTS; AU NANORODS; SERS MICROPROBE; NANOPARTICLES; MECHANISM; ADSORPTION; SCATTERING;

D O I：

10.1021/la202918n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：14748 / 14756

页数：9

共 47 条

[1] Gold nanorods as nanoadmicelles: 1-naphthol partitioning into a nanorod-bound surfactant bilayer [J].