SERS Sensing Properties of New Graphene/Gold Nanocomposite

The development of graphene (G) substrates without damage on the sp<sup>2</sup> network allows to tune the interactions with plasmonic noble metal surfaces to finally enhance surface enhanced Raman spectroscopy (SERS) effect. Here, we describe a new graphene/gold nanocomposite obtained b...

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Bibliographic Details
Main Authors: Giulia Neri, Enza Fazio, Placido Giuseppe Mineo, Angela Scala, Anna Piperno
Format: Article
Language:English
Published: MDPI AG 2019-08-01
Series:Nanomaterials
Subjects:
Online Access:https://www.mdpi.com/2079-4991/9/9/1236
Description
Summary:The development of graphene (G) substrates without damage on the sp<sup>2</sup> network allows to tune the interactions with plasmonic noble metal surfaces to finally enhance surface enhanced Raman spectroscopy (SERS) effect. Here, we describe a new graphene/gold nanocomposite obtained by loading gold nanoparticles (Au NPs), produced by pulsed laser ablation in liquids (PLAL), on a new nitrogen-doped graphene platform (G-NH<sub>2</sub>). The graphene platform was synthesized by direct delamination and chemical functionalization of graphite flakes with 4-methyl-2-<i>p</i>-nitrophenyl oxazolone, followed by reduction of <i>p</i>-nitrophenyl groups. Finally, the G-NH<sub>2</sub>/Au SERS platform was prepared by using the conventional aerography spraying technique. SERS properties of G-NH<sub>2</sub>/Au were tested using Rhodamine 6G (Rh6G) and Dopamine (DA) as molecular probes. Raman features of Rh6G and DA are still detectable for concentration values down to 1 &#215; 10<sup>&#8722;5</sup> M and 1 &#215; 10<sup>&#8722;6</sup> M respectively.
ISSN:2079-4991