Origin of layer-dependent SERS tunability in 2D transition metal dichalcogenides

Abstract

Exploring the influence of interlayer interaction on SERS performance by using 2D PtSe2 and ReS2 with different numbers of layers as the research objects.

Enhanced Raman scattering on two-dimensional palladium diselenide

“…These values are close to that on some other 2D materials (e.g. −1.62 eV on graphene), 40 indicating the strong interaction between R6G and few-layer PdSe 2 . However, the energy difference for monolayer, bilayer and trilayer PdSe 2 is so small that the strong thickness-dependent Raman enhancement may originate from factors other than adsorption energy.…”

Semiconductor-based surface enhanced Raman scattering (SERS): from active materials to performance improvement

“…It has tunable thickness, interlayer gap, and phase structure, resulting in many excellent photoelectric properties including SERS. [56][57][58][59] Ultrathin 2D NbS 2 was synthesized by a chemical vapor deposition method and proved to be an excellent SERS substrate 60 (Fig. 5a and b).…”

A photo-responsive p-Si/TiO2/Ag heterostructure with charge transfer for recyclable surface-enhanced Raman scattering substrates

“…[9][10][11] However, for a long time, the EM mechanism has been thought to be the principal strategy given the very strong SERS activity of noble metal colloidal particles (including silver (Ag), gold (Au) and copper (Cu)). [12][13][14][15] The EM enhancement mechanism, commonly known as the "hot spot" effect, mainly comes from the randomly distributed noble metal nano aggregates, with great signal fluctuation. Moreover, colloidal materials have poor storage stability, and are affected easily by external environmental factors such as temperature, pH and ion concentration.…”