3D Nanostructures of Silver Nanoparticle-Decorated Suspended Graphene for SERS Detection
| Autor: | Chun-Hway Hsueh, Li-Wei Nien, Miao-Hsuan Chien, Miin-Jang Chen, Bo-Kai Chao, Jia-Han Li |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Graphene Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Isotropic etching Silver nanoparticle 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention symbols.namesake General Energy law Etching (microfabrication) symbols Physical and Theoretical Chemistry 0210 nano-technology Raman spectroscopy Graphene nanoribbons Raman scattering Plasmon |
| Zdroj: | The Journal of Physical Chemistry C. 120:3448-3457 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b11940 |
| Popis: | The silver nanoparticle-decorated suspended graphene was proposed and fabricated to increase the efficiency of surface-enhanced Raman scattering (SERS) mainly by the enhanced electric field resulting from exciting the localized surface plasmon resonance. The morphology of cavity under the graphene was controlled by the thickness of catalyst and the etching time in the metal-assisted chemical etching process (MacEtch). The reflectance and ellipsometric spectra were examined to understand the optical behaviors of silver nanoparticle-decorated suspended graphene as functions of the etching time. For the samples treated with MacEtch, the Raman signals of graphene and p-mercaptoaniline were greatly enhanced due to the plasmonic cavity effect. Moreover, the graphene could increase the Raman intensity of the probed molecules by chemical enhancement. With the optimal etching time of 15 s, the SERS signals reached the maximum that was 13–15 times larger than those without etching. The electric field enhancement pr... |
| Databáze: | OpenAIRE |
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