Surface Enhanced Raman Spectroscopy Devices Research Articles

Silver-based surface enhanced Raman spectroscopy devices for detection of organophosphorus pesticides traces.

The detection of traces of substances by surface-sensitive techniques such as surface enhanced Raman spectroscopy (SERS) explores the interaction of adsorbed molecules on plasmonic surfaces to improve the limit of detection of analytes. This article is an overview about recent development in SERS substrates applied in the detection of organophosphorus pesticides on plasmonic surfaces (arrays of metal nanoparticles). The morphology, roughness, chemical functionalization degree, and aggregation level of plasmonic centers are some of the critical parameters to be controlled in the optimization of SERS signal from specific analytes.

Broadband, on-chip surface enhanced Raman spectroscopy realized using CMOS compatible manufacturing

A high-performance and reproducible self-contained surface enhanced Raman spectroscopy device was developed using atomic layer deposition and deep UV lithography for fabrication on complex substrates.

Dodecagonal plasmonic quasicrystals for phage-based biosensing

In this work, we fabricate and characterize a novel sensitive two-dimensional surface enhanced Raman spectroscopy (SERS) substrate made of plasmonic nanocavities in a photonic quasicrystal arrangement characterized by a 12-fold rotational symmetry. Our SERS device is capable of detecting chemisorbed bacteriophages at a femtomolar range. Most importantly, the paper presents for the first time a study on the procedure to functionalize the plasmonic quasicrystal with bacteriophages of the Podoviridae family. The immobilization of the phages on the plasmonic substrate has been studied and verified through SERS measurements. A new stable peak, visible in the SERS spectra at 1326 cm−1 at a greater than 60 times amplification, confirms the immobilization of the phages on the substrate. This functionalization approach can be used also for other types of phages or plasmonic sensors and hence, our achievements could allow the development of novel systems for the specific detection of different species of bacteria.

Gold nanoparticles deposited on the surface of low-dimensional niobium trisulfide and vanadium tetrasulfide

In the past few years, a lot of attention has been directed to the synthesis of nanosized transition metal chalcogenides and their composites with noble metal nanoparticles. Materials of this type demonstrate enhanced properties in energy storage, catalysis and surface enhanced Raman spectroscopy devices. Although layered transition metal dichalcogenides are well studied, some other chalcogenides, namely layered niobium trisulfide (NbS3) and quasi-onedimensional vanadium tetrasulfide (VS4), have received less attention by comparison. In this work, we synthesized nanocomposites based on 2D niobium trisulfide and 1D vanadium tetrasulfide with gold nanoparticles and investigated their morphology and phase composition by transmission electron microscopy and X-Ray diffraction.