Abstract
A composite one-dimensional (1D) Ag sinusoidal nanograting aiming at label-free surface enhanced Raman scattering (SERS) detection of TNT with robust and reproducible enhancements is discussed. 1D periodic sinusoidal SiO2 grating followed by Ag evaporation is proposed for the creation of reproducible and effective SERS substrate based on surface plasmon polaritons (SPPs). The optimal structure of 1D sinusoidal nanograting and its long-range SERS effect are analyzed by using the finite difference time domain (FDTD). Simulation SERS enhancement factor (EF) can be 5 orders of magnitude as possible. This SERS substrate is prepared by the interference photolithography technology, its SERS performance is tested by Rh6G detection experiments, and the actual test EF is about 104. The label-free SERS detection capacity of TNT is demonstrated in the experiment.
Highlights
At present, the main surface enhanced Raman scattering (SERS) substrates integrated with microfluidics for trace explosives detection are rough noble metallic substrates, self-assembly noble metallic nanoparticles substrates, noble metallic periodic arrays, and composite graphene substrates [1]
Detected explosives molecules should be absorbed on these nanostructures with label reagents, and nanostructures need to be cleaned before the application [11], it cannot be used in the real-time and label-free SERS detection of trace explosives
We show a composite 1D Ag sinusoidal nanograting aiming at the label-free SERS detection of trace TNT
Summary
The main surface enhanced Raman scattering (SERS) substrates integrated with microfluidics for trace explosives detection are rough noble metallic substrates, self-assembly noble metallic nanoparticles substrates, noble metallic periodic arrays, and composite graphene substrates [1]. Uncontrolled nanoparticles aggregation of self-assembly noble metallic nanoparticles substrate leads to poor reproducibility of the SERS signal and seriously limits its wide applications [2]. From theoretical and simulation points of view, the excitation surface plasmon polaritons (SPPs) performance of this substrate is researched, and it has a long-range SERS effect. It has potential in label-free testing of trace TNT. Composite 1D sinusoidal Ag nanogratings are fabricated, and their label-free SERS testing performance of trace TNT is studied
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