Near-Field Response on the Far-Field Wavelength-Scanned Surface-Enhanced Raman Spectroscopic Study of Methylene Blue Adsorbed on Gold Nanocolloidal Particles
| Autor: | Manash Ghosh, Sannak Dutta Roy, Joydeep Chowdhury |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Absorption spectroscopy Surface plasmon Physics::Optics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Spectral line 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake Wavelength General Energy symbols Physical and Theoretical Chemistry 0210 nano-technology Absorption (electromagnetic radiation) Raman spectroscopy Excitation Raman scattering |
| Zdroj: | The Journal of Physical Chemistry C. 122:10981-10991 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.8b00315 |
| Popis: | Wavelength-scanned surface-enhanced Raman spectroscopic studies of methylene blue (MB) molecules adsorbed on nanocolloidal gold (AuNC) surface have been reported. The correlations between the absorption and extinction spectra of the AuNC with the far-field surface-enhanced Raman scattering (SERS) spectra of the MB molecule have been drawn. The extinction spectra of the nanoantennas (NAs) are mapped from the high-resolution transmission electron microscopic image. The coupling of the incident polarized electric fields EP and ES with the extinction spectra has been critically explored. The SERS spectra of the MB molecule recorded at various excitation wavelengths only exhibit enhanced Raman bands for the 632.8 nm laser line excitation. Interestingly, this excitation wavelength corresponds to the region of a broad hump extending ∼620–750 nm in the absorption spectra of the AuNC–MB system. The appearance of this broad hump has been ascribed to the collective surface-like surface plasmon resonances (SL-SPRs)... |
| Databáze: | OpenAIRE |
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