Nanoporous gold (NPG) has been synthesized by electrochemical de-alloying a new precursor, amorphous Au30Cu38Ag7Pd5Si20 (at.%), starting from melt-spun ribbons. Ligaments ranging from 75 to 210 nm depending on the de-alloying time were obtained. Analytical and electrochemical evidence showed the ligaments contain residual Cu, Ag and Pd. Surfaceenhanced Raman scattering from the NPG was investigated using pyridine and 4,4′-bi-pyridine as probe molecules. It was found that the activity is at maximum when the ribbon is fully de-alloyed although the ligaments then have a larger size. The enhancement is attributed to the small size of crystals in the ligaments, to their morphology and to trapped atoms.

Nanoporous gold obtained from a metallic glass precursor used as substrate for surface-enhanced Raman scattering

SCAGLIONE, FEDERICO;PASCHALIDOU, EIRINI MARIA;RIZZI, Paola;BORDIGA, Silvia;BATTEZZATI, Livio
2015-01-01

Abstract

Nanoporous gold (NPG) has been synthesized by electrochemical de-alloying a new precursor, amorphous Au30Cu38Ag7Pd5Si20 (at.%), starting from melt-spun ribbons. Ligaments ranging from 75 to 210 nm depending on the de-alloying time were obtained. Analytical and electrochemical evidence showed the ligaments contain residual Cu, Ag and Pd. Surfaceenhanced Raman scattering from the NPG was investigated using pyridine and 4,4′-bi-pyridine as probe molecules. It was found that the activity is at maximum when the ribbon is fully de-alloyed although the ligaments then have a larger size. The enhancement is attributed to the small size of crystals in the ligaments, to their morphology and to trapped atoms.
2015
95
9
474
482
www.tandf.co.uk/journals/titles/09500839.asp
amorphous alloys; porous metals; De-alloying; melt spinning; nanograined structures; Raman spectroscopy; SERS; Condensed Matter Physics
Scaglione, F; Paschalidou, E.M.; Rizzi, P.; Bordiga, S.; Battezzati, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1532255
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