Tip-Enhanced Raman Nanospectroscopy of Smooth Spherical Gold Nanoparticles
| Autor: | James E. Evans, Patrick Z. El-Khoury, Irina V. Novikova, Zachary D. Schultz, Zhihua Cheng, Ashish Bhattarai, Matthew R. Jones, Alan G. Joly |
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| Rok vydání: | 2020 |
| Předmět: |
Chemical imaging
Materials science Silicon Scattering Physics::Optics chemistry.chemical_element Nanoparticle 02 engineering and technology Optical field 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics 0104 chemical sciences Optical rectification symbols.namesake chemistry Colloidal gold symbols General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Raman spectroscopy |
| Zdroj: | The journal of physical chemistry letters. 11(5) |
| ISSN: | 1948-7185 |
| Popis: | We record nanoscale-resolved chemical images of thiobenzonitrile (TBN)-functionalized smooth gold nanospheres on silicon via tip-enhanced Raman (TER) nanospectroscopy. The recorded images trace the nascence of the familiar doughnut-shaped scattering profile of nanoparticles on silicon at its origin (the particle surface), which appears as a horseshoe-shaped scattering pattern under our experimental conditions. The local optical field maps are in agreement with their simulated finite-difference time-domain analogues. Analysis of the recorded spectra with the aid of ab-initio-molecular-dynamics-based Raman spectral simulations further suggests that optical rectification and molecular charging take place throughout the course of atomic-force-microscopy-based TER nanoscale chemical imaging. |
| Databáze: | OpenAIRE |
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