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Breaking Down SERS Detection Limit: Engineering of a Nanoporous Platform for High Sensing and Technology

Articolo
Data di Pubblicazione:
2022
Abstract:
Abstract: In this study, nanoporous gold (NPG) was synthesized by free corrosion dealloying of an amorphous precursor, Au20Cu48Ag7Pd5Si20 (at. %), in a mixture of nitric and hydrofluoric acid, starting from amorphous melt-spun ribbons. NPG revealed a 3D nanoporous structure composed of pores and multigrain ligaments of an average size of 60 nm. NPG was further anodized in oxalic acid at 8 V vs. Ag/AgCl reference electrode to obtain a bimodal morphology composed of ligaments disrupted in finer features. Both NPG and anodized samples (A-NPG) were found to be mechanically stable to bending and active for surface-enhanced Raman scattering (SERS). SERS activity of samples was investigated using 4,40-bipyridine as a probe molecule. A detection limit of 1016 Mwas found for both samples, but in A-NPG, the signal was strongly enhanced. The extremely high enhancement obtained for A-NPG is attributed both to the small size of ligaments and crystals of which they are made, as well as to the nanometric features resulting from anodization treatment. Such a microstructure showed homogenous SERS response in terms of average enhancement all across the surface, as demonstrated by mapping measurements. Furthermore, NPG and A-NPG were tested as electrodes for electrocatalytic applications, showing good properties. The engineering steps from the amorphous precursor to A-NPG led us to obtain a high-sensing platform, with extremely low detection limit and intrinsic properties, that might significantly contribute to the cutting-edge technology of the future.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
nanoporous gold; anodization; chemical dealloying; amorphous precursor; SERS; electrocatalyst
Elenco autori:
Scaglione, Federico; Battezzati, Livio; Rizzi, Paola
Autori di Ateneo:
RIZZI Paola
SCAGLIONE Federico
Link alla scheda completa:
https://iris.unito.it/handle/2318/1862361
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1862361/998302/Scaglione%20F._Nanomaterials_2022.pdf
Pubblicato in:
NANOMATERIALS
Journal
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Settori (4)


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