Graphene Oxide/Gold Nanorod Nanocomposite for Stable Surface-Enhanced Raman Spectroscopy
Autor: | Jake Fontana, Sergio H. Domingues, Pilar G. Vianna, Daniel Grasseschi, Christiano J. S. de Matos, G.K.B. Costa, Isabel C. S. Carvalho |
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Rok vydání: | 2016 |
Předmět: |
Materials science
Oxide Nanotechnology 02 engineering and technology Substrate (electronics) 010402 general chemistry 01 natural sciences law.invention Rhodamine chemistry.chemical_compound symbols.namesake law Electrical and Electronic Engineering Nanocomposite Graphene Surface-enhanced Raman spectroscopy 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Chemical engineering symbols Nanorod 0210 nano-technology Raman spectroscopy Biotechnology |
Zdroj: | ACS Photonics. 3:1027-1035 |
ISSN: | 2330-4022 |
Popis: | We introduce a graphene oxide/gold nanorod nanocomposite as a surface-enhanced Raman spectroscopy (SERS) substrate that suppresses the usual temporal intensity fluctuations, commonly referred to as blinking. The temporal stability of the SERS spectra from the nanocomposite is statistically determined using the coefficient of variation of the integrated spectra. We demonstrate that, by introducing graphene oxide, the coefficient of variation from the nanocomposite is five times smaller when compared to gold nanorods without graphene oxide, which is attributed to the removal of the nanorod’s surfactant from plasmonic hot spots due to graphene oxide–surfactant interaction. The resulting nanocomposite can, then, be used as a reliable substrate for precise SERS chemical analysis. The nanocomposite is, therefore, analyzed as a SERS substrate for the detection of Rhodamine 640, providing a 4-fold stability improvement relative to gold nanorods without graphene oxide, while the dye’s Raman signal is enhanced both... |
Databáze: | OpenAIRE |
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