Hedgehog Inspired CuO Nanowires/Cu2O Compositesrnfor Broadband Visible-Light-Driven Recyclable SurfacernEnhanced Raman Scattering

摘要

Self-cleanable surface-enhanced Raman scattering (SERS) spectroscopyrnaffords a promising route toward environment-friendly biosensors for pointof-rncare diagnostics. It is of great importance to develop recyclable SERSrnsubstrates driven by a photocatalytic decomposition process, especially in thernvisible range. In this work, inspired by the hedgehog-like structures, a broadbandrnvisible-light-driven photocatalytic SERS platform with the CuO nanowiresrn(NWs)/Cu2O hetero-nanostructures as the backbone is demonstrated.rnVia employing the approach of nanosecond laser ablation on Cu sheetrncoupled with subsequent thermal oxidation, the formed hedgehog-like, highdensity,rnand dual-scale microanostructures not only demonstrate enhancedrnbroadband visible-light-absorption capability even extended to the nearrninfrared range but also exhibit boosted interfacial adhesion with favorablernstability. Such phenomena imply that the binary oxidized Cu composites decoratedrnwith metallic nanoparticles can serve as high-performance SERSrnsubstrates with superior recyclability. Under the visible light illumination, thernas-fabricated ternary Ag/CuO NWs/Cu2O composites can be self-cleaned byrnphotocatalytic degradation of adsorbates, thus leading to recyclable SERSrnsubstrates, which can preserve more than 85% SERS activity after sevenrncycles’ measurement. These results pave a new path to realize reusable SERSrnsubstrates in the applications of remote and resource-limited environmentsrntoward next-generation green biosensors.