Double Ag nanowires on a WS₂ /graphene Heterostructure for surface enhanced Raman scattering.

Authors

Liu Lu, Shibo Yan, Zhenxing Xue, Xiaofang Xu

Published in

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. Volume 363. Issue Pt 1. Pages 128384. Jul 10, 2026. Epub Jul 10, 2026.

Abstract

Developing high-performance surface-enhanced Raman scattering (SERS) substrates is essential for ultra-sensitive chemical sensing. In this study, a novel hybrid SERS platform was fabricated by integrating double-aligned silver nanowires (ag NWs) onto vertical heterostructures comprising triangular monolayer tungsten disulfide (WS₂) and graphene. By employing rhodamine 6G (R6G) as a probe molecule, the SERS comparisons in two groups of ML graphene versus WS₂/graphene heterostructure and ag/graphene versus ag/WS₂/graphene heterostructure reveal that the WS₂/graphene vertical heterostructure exhibits to be a better SERS performance than monolayer graphene. The enhancement factor and the limit of detection of the R6G for the ag/WS₂ /graphene were 6.055×10⁷and 1.0 × 10^-8 M, respectively. Notably, the Raman intensity of the R6G at the 1651 cm^-1 characteristic peak for the ag/WS₂ /graphene heterostructure is 2.8 and 10.9 times that of the ag/graphene and WS₂/graphene substrates, respectively. Moreover, the role of the WS₂ /graphene heterostructure in the SERS was investigated based on the density functional theory calculations. The remarkable SERS enhancement of the ag/WS₂ /graphene heterostructure stems from the synergistic coupling between ag NW-induced localized electromagnetic enhancement and WS₂/graphene-mediated charge-transfer enhancement. All the results were conducted in micro-scale on the same sample consisted of two aligned ag NWs with half on a WS₂ /graphene heterostructure and the other half on ML graphene. Additionally, the polarization dependence of the SERS of ag NWs-WS₂ /graphene heterostructure was also investigated.

PMID:
42456246
Bibliographic data and abstract were imported from PubMed on 16 Jul 2026.

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