Templated syntheses of Pt thin films with feature sizes of 3, 6 and 9 nm and their effects on SERS

Abstract

We report on the syntheses of nanostructured Pt films with three different feature sizes of 3, 6 and 9 nm and their effects to the surface enhance Raman spectroscopy of rhodamine 6G (Rh6G) analytes. The syntheses of the Pt films have been achieved through templating the pore structures of mesoporous silica thin films (MSTFs). For the purpose of the present study, we synthesized three MSTFs with pore sizes 3, 6 and 9 nm. Other than the pore sizes, the silica thin films have the same pore structures. The Pt films have been synthesized by depositing Pt into the pores of the template MSTFs and removing the templates after the deposition. The Pt films produce strong Raman spectra of Rh6G with the intensity increasing as the feature size of the Pt film increases. Simulations of the induced electromagnetic fields on the Pt films show the same trend as the observed Raman intensity with the feature size.

High-Density Ordered Arrays of CoPt3 Nanoparticles with Individually Addressable Out-of-Plane Magnetization

“…The cagelike pores merge into perpendicular pore channels during the MTF aging process (Figures S1 and S2 in the Supporting Information). By the use of such MTF templates, arrays of Pt NPs with various sizes ranging from 3 to 9 nm have been achieved …”

“…39 By the use of such MTF templates, arrays of Pt NPs with various sizes ranging from 3 to 9 nm have been achieved. 40 Another issue of the BPM approach is aligning the magnetic moment of the NPs out of plane with respect to the substrate surface. In the case of thin films of L1 0 phases, several underlayer materials such as Ag 41 and MgO 42 are known to induce such preferential growth.…”

Enhanced Raman scattering based on fabry‐perot like resonance in a metal‐cladding waveguide

“…With the advent of a number of novel but well established fabrication methods, intense effort has been devoted to generate hot spots by more and more carefully designed and sophisticated nanostructures, such as the junctions between metallic particles and the apexes of tailor-made probes. [5][6][7][8][9][10] However, the uniformity, reproducibility, and overall volume density of the hot spots remain a challenge, and the enhancement factor relies crucially on various parameters. Furthermore, in order to take full advantage of this technology, specially designed substrates are usually required to be compatible with the specific analyte.…”

“…Detection at single‐molecule level has already been realized experimentally, because the enhancement factor at some ‘hot spots’ or ‘hot junctions’ can be on the order of 10 10 –10 14 . With the advent of a number of novel but well established fabrication methods, intense effort has been devoted to generate hot spots by more and more carefully designed and sophisticated nanostructures, such as the junctions between metallic particles and the apexes of tailor‐made probes 5‐10 . However, the uniformity, reproducibility, and overall volume density of the hot spots remain a challenge, and the enhancement factor relies crucially on various parameters.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part VIII

“…The Pt films produce strong Raman spectra of Rh6G with the intensity increasing as the feature size of the Pt film increases. Simulations of the induced electromagnetic fields on the Pt films show the same trend as the observed Raman intensity with the feature size . Marzec and colleagues studied substituent effects on the structure and surface activity of N‐methylpyridinium salts by FT‐IR, FT‐RS, SERS, and DFT calculations .…”