Temperature dependence of a1 and b2 type modes in the surface enhanced Raman from 4-Aminobenzenethiol

Abstract

Surface enhanced Raman scattering (SERS) from molecules absorbed onto plasmon active substrates is known to possess continuum emission profiles upon which Stokes Raman peaks are super-imposed. We study here the effect of temperature upon the continuum emission and Stokes Raman peak ratios from a monolayer of probe molecules prepared on a plamon active nanocavity array from an active spherical cap architecture nanomaterial substrate. Our results show that there is partial recover of SERS spectral profile following heating. This change is interpreted in terms of a molecular rearrangement of molecules on the substrates surface.

Surface enhanced luminescence and Raman scattering from ferroelectrically defined Ag nanopatterned arrays

“…Metallic nanostructures made from metals such as silver or gold yield plasmons when light creates a collective oscillation of the conduction electrons on the surface of the metal. [1][2][3][4][5][6][7] The characteristic properties of the plasmonic structures have been found to be greatly dependent on factors such as size, shape, and dielectric environment. [2][3][4][5][6][7] Constructing specific patterns or architectures of plamonic active materials with nanoscale control and feature size is of interest in a variety of plasmonic applications ranging from sensing to enhanced fluorescence.…”

“…[1][2][3][4][5][6][7] The characteristic properties of the plasmonic structures have been found to be greatly dependent on factors such as size, shape, and dielectric environment. [2][3][4][5][6][7] Constructing specific patterns or architectures of plamonic active materials with nanoscale control and feature size is of interest in a variety of plasmonic applications ranging from sensing to enhanced fluorescence. 1,2 Self-assembly is the spontaneous and reversible organization of particulate units (e.g., molecules or nanoparticles) into higher ordered structures, 8,9 which has been applied to produce a wide range of materials with nanometer sized features such as one dimensional quantum wires or zero dimensional quantum dots.…”

“…This is an emerging method that enables directed self-assembly, which potentially offers a cost effective way to create arrays of metallic nanostructures. 6,19 This approach has the potential to enable control of surface self-assembly processes with nanoscale precision over mm to cm lateral sample sizes and beyond, making such an approach applicable to engineer plasmonic devices.…”

“…The observed Raman scattering bands match all the observed spectral features for the probe molecule. [5][6][7] Recording the Raman scattering off the silver by positioning the probe laser away from the Ag nanopatterned arrays, probing only the LiNbO 3 substrate þ Rh6G was also performed. The resulting Raman scattering spectrum is shown in Fig.…”

“…The samples were illuminated with visible light through a 50Â objective lens, and the Raman scattering signals were collected at a backscattered angle and directed onto a charge coupled device (CCD) via a monochromator. [3][4][5][6][7] The setup for the Raman scattering studies on the PPE sample was with laser power ¼ 25 mW and excitation wavelength k ex ¼ 532 nm.…”