Journal
CHEMICAL PHYSICS LETTERS
Volume 665, Issue -, Pages 6-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2016.10.046
Keywords
Nanoporous gold; Chemical de-alloying; Metallic glass; Raman scattering
Funding
- European Commission, Marie Curie Actions - Initial Training Networks (ITN) in the frame of the project VitriMetTech - Vitrified Metals Technologies and Applications in Devices and Chemistry, FP7-PEOPLE-ITN [607080]
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Three dimensional nanoporous gold, with an average ligament size of 50 nm, was fabricated by chemical de-alloying from a new Au based metallic glass precursor. The resultant nanoporous gold gives rise to superior surface enhanced Raman scattering (SERS) capability using 4,40-bi-pyridine as probe molecules. The SERS intensity mapping images confirm the presence of hot spots. A low detection limit down to 10 (14) M for bipyridine was achieved, which is attributed to the localized enhanced electromagnetic fields around nano-sized ligaments, the electromagnetic coupling between ligaments, and the trapped SERS sensitive atoms. (C) 2016 Elsevier B.V. All rights reserved.
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