Polarization- and Wavelength-Dependent Surface-Enhanced Raman Spectroscopy Using Optically Anisotropic Rippled Substrates for Sensing
| Autor: | Hoang Khoa Ly, Thomas W. H. Oates, Norbert Esser, Ulrich Gernert, Stefan Facsko, Inez M. Weidinger, Benjamin Schreiber, Dimitra Gkogkou, Karsten Hinrichs, Uwe Kuhlmann, Peter Hildebrandt, Timur Shaykhutdinov |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Brewster's angle Materials science Process Chemistry and Technology Analytical chemistry Bioengineering 02 engineering and technology Surface-enhanced Raman spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Molecular physics 0104 chemical sciences symbols.namesake Ellipsometry Monolayer symbols 0210 nano-technology Raman spectroscopy Instrumentation Plasmon Raman scattering |
| Zdroj: | ACS Sensors. 1:318-323 |
| ISSN: | 2379-3694 |
| DOI: | 10.1021/acssensors.5b00176 |
| Popis: | Anisotropic Ag nanoparticle arrays were created by metal evaporation on rippled silicon templates for sensing of molecules with surface-enhanced Raman spectroscopy. Our results show that these substrates can be used for analysis of complex molecular mixtures and discrimination of solvent molecules. These properties are due to their polarization and wavelength dependency that provide enhancement in a wide spectral range. The dielectric function parallel and perpendicular to the long axis of the nanostructures was determined via ellipsometry yielding two different plasmonic resonances. Polarized surface-enhanced raman scattering (SERS) was subsequently measured as a function of the polarization angle θ for a 4-mercaptobenzonitrile self-assembled monolayer covalently attached to the Ag surface. For 514 nm excitation a cos2 θ-dependence and for 647 nm excitation a sin2 θ-dependency were found, with the maxima expressing the resonances perpendicular and parallel to the ripples, respectively. Those results open... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|