Abstract
In this paper, a new method for manufacturing flexible and repeatable sensors made of silicon solar cells is reported. The method involves depositing the noble metal film directly onto the Si template and stripping out the substrate with a pyramid morphology by using an adhesive polymer. In order to evaluate the enhancement ability of the substrate, Rhodamine 6G (R6G) were used as surface-enhanced Raman scattering (SERS) probe molecules, and the results showed a high sensitivity and stability. The limit of detection was down to M for R6G. The finite-difference time domain (FDTD) was used to reflect the distribution of the electromagnetic field, and the electric field was greatly enhanced on the surface of the inverted pyramidal substrate, especially in pits. The mechanism of Raman enhancement of two types of pyramidal SERS substrate, before and after stripping of the noble metal film, is discussed. By detecting low concentrations of plasmid DNA, the identification of seven characteristic peaks was successfully realized using a noble metallic pyramidal substrate.
Highlights
Surface-enhanced Raman spectroscopy (SERS) is a potent noninvasive spectroscopy technology that can detect and characterize small organic molecules and large biomolecules at very low concentrations and at a single-molecule level
The base model placed in the model, air, theincluding periodic resolution cubic boundary grid in a three-dimensional system was was established in the boundary conditions close to the model were applied in the x and y directions, and the zthe appropriate boundary conditions
The base model was placed in the air, the periodic direction was surrounded by a perfectly matched layer (PML), in which a with a boundary conditions close to the model were applied in the x and y directions, and the thickness greater than the wavelength was used to avoid false boundary reflection
Summary
Surface-enhanced Raman spectroscopy (SERS) is a potent noninvasive spectroscopy technology that can detect and characterize small organic molecules and large biomolecules at very low concentrations and at a single-molecule level. Since the discovery of SERS on the surface of noble metals, a new era of Raman spectroscopy has emerged. Metallic substrates with periodic subwavelength structures exhibit unique surface isobaric properties, providing an enhanced electromagnetic field and producing a strong optical response [5,6,7], resulting in SERS, which is of great scientific significance and considerable technical importance for the development of nanophotonic devices, data storage, and biosensors. Noble metallic nanoparticles already have widespread applications in creating local surface plasmon resonance (LSPR). By adjusting the geometry and optical properties of the nanoparticles, the Raman signal is greatly enhanced [8,9,10]. To control nanostructures and generate a larger local EM field, the design and manufacture of ordered and uniform nanostructured
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