Observing Plasmon Damping Due to Adhesion Layers in Gold Nanostructures Using Electron Energy Loss Spectroscopy
| Autor: | Mark L. Brongersma, Majid Esfandyarpour, Robert Sinclair, Steven J. Madsen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nanostructure
Materials science Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Article symbols.namesake Scanning transmission electron microscopy Electrical and Electronic Engineering Surface plasmon resonance Plasmon business.industry Electron energy loss spectroscopy technology industry and agriculture Adhesion 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials symbols Optoelectronics 0210 nano-technology business Raman spectroscopy Biotechnology Localized surface plasmon |
| Zdroj: | ACS Photonics. 4:268-274 |
| ISSN: | 2330-4022 |
| Popis: | Gold plasmonic nanostructures with several different adhesion layers have been studied with monochromated electron energy loss spectroscopy in the scanning transmission electron microscope (STEM-EELS) and with surface enhanced Raman spectroscopy (SERS). Compared to samples with no adhesion layer, those with 2nm of Cr or Ti show broadened, lower intensity plasmon peaks as measured with EELS. This broadening is observed in both optically active (“bright”) and inactive (“dark”) plasmon modes. When the former are probed with SERS, the signal enhancement factor is lower for samples with Cr or Ti, another indication of reduced plasmon resonance. This work illustrates the capability of STEM-EELS to provide direct near-field measurement of changes in plasmon excitation probability with nano-scale spatial resolution. Additionally, it demonstrates that applications which require high SERS enhancement, such as biomarker detection and cancer diagnostics, can be improved by avoiding the use of a metallic adhesion layer. |
| Databáze: | OpenAIRE |
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