Structural Transition in the Surfactant Layer that Surrounds Gold Nanorods as Observed by Analytical Surface-Enhanced Raman Spectroscopy
| Autor: | Jason H. Hafner, Seunghyun Lee, Lindsey J. E. Anderson, Courtney M. Payne |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Bilayer Dispersity Analytical chemistry Surfaces and Interfaces Surface-enhanced Raman spectroscopy Condensed Matter Physics chemistry.chemical_compound symbols.namesake chemistry Pulmonary surfactant Electrochemistry symbols General Materials Science Nanorod Raman spectroscopy Ethylene glycol Layer (electronics) Spectroscopy |
| Zdroj: | Langmuir. 27:14748-14756 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la202918n |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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