The Effect of Ag Nanoparticles on Surface-Enhanced Luminescence from Au Nanovoid Arrays

Abstract

Key wordsNanoparticles, gold nanovoid arrays, Raman, luminescence AbstractStudies comparing the effect of adding two different nanoparticles compositions on the plasmonic properties of Au nanovoid arrays were undertaken. Surface enhanced resonance luminescence and surface enhanced resonance Raman studies comparing dispersed Ag nanoparticles and Ag nanoparticle aggregates on gold nanovoid arrays were undertaken. These studies showed that using Ag nanoparticle aggregates increased the both luminescence and Raman efficiency relative to when dispersed nanoparticles were used, in addition these studies also showed that adding dispersed Ag nanoparticles supported a more reproducible enhancement in luminescence and Raman across the substrate compared to using Ag nanoparticle aggregates. Finite element analysis simulations indicated that surface plasmon polariton distribution in the sample was affected by the presence of the Ag nanoparticles on the Au nanovoid array.

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.…”

“…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.…”

“…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.…”

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

“…Plasmon active arrays possessing regularly positioned plasmon active sites provide a geometry design that supports a homogenous signal enhancement across a large sample surface area. Modern nanofabrication methodologies enable the creation of a number of different nanostructures with precisely controlled shapes, sizes, and spacing [3][4][5][6][7][8][9][10]. This has extended to the creation of a range of different metallic nanostructures array designs that produce localized surface plasmon resonances (LSPRs) [8][9][10][11][12][13][14][15].…”