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

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 4,4'-bipyridine as a probe molecule. A detection limit o

SUBMITTER: Scaglione F 

PROVIDER: S-EPMC9143797 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature