Abstract
In this study, a novel composite Surface-Enhanced Raman Scattering (SERS) substrate is proposed for ultrasensitive detection. Consisting of gold sinusoidal nanograting and silver colloidal nanoparticles (AgNPs-AuSG), this type of SERS substrate is easy for fabrication by maskless laser interference lithography, and capable of providing large-scale ultra-high field enhancement, attributed to localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs). The enhancement factor (EF) of this composite substrate is as high as up to 10 orders of magnitude in the simulation experiment. Experimental results show that this large-area, productive SERS substrate of AgNPs-AuSG has realized sensitive TNT and RDX detection with the limit of detection (LOD) of 10−10 M, which may be a potential candidate for trace explosives detection.
Highlights
Surface-enhanced Raman spectroscopy (SERS), as a ‘chemical fingerprint’ of the target materials, is a sensitive and reliable detection method extensively employed in biosensors [1,2], food security [3,4], and environment safety [5,6]
The substrate is composed of two parts: one is the gold sinusoidal grating (AuSG) as a fixed substrate; the other is silver colloidal nanoparticles (AgNPs), which act as a flowing substrate
Excitation of surface plasmon polaritons (SPPs) is detected as a minimum the reflected light
Summary
Surface-enhanced Raman spectroscopy (SERS), as a ‘chemical fingerprint’ of the target materials, is a sensitive and reliable detection method extensively employed in biosensors [1,2], food security [3,4], and environment safety [5,6]. Ardini et al [12] designed a large area-efficient SERS substrate, a nanoporous gold decorated with silver nanoparticles. These substrates have giant enhancement due to strong near-field coupling. The metal nanoparticles (NPs) are periodically arranged with several nanometers apart from each other, which can act as a two-dimensional grating to excite the SPP wave, leading to the coupling of LSPs and SPPs [16]. The substrate is composed of two parts: one is the gold sinusoidal grating (AuSG) as a fixed substrate; the other is silver colloidal nanoparticles (AgNPs), which act as a flowing substrate.
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