Origin of the Giant Enhanced Raman Scattering by Sulfur Chains Encapsulated inside Single-Wall Carbon Nanotubes
| Autor: | Antonio G. Souza Filho, Chengyin Fu, Juchen Guo, Simone S. Alexandre, Wellington Q Neves, Cristiano Fantini, Robert C. Haddon, Ricardo Nunes, Viviane Valquíria Do Nascimento, Guanghui Li, Rafael S. Alencar, Elena Bekyarova |
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| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Nanotube Materials science General Engineering General Physics and Astronomy Resonance 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention symbols.namesake Chemical physics law Excited state Molecular vibration symbols General Materials Science Density functional theory 0210 nano-technology Raman spectroscopy Raman scattering |
| Zdroj: | ACS Nano. 15:8574-8582 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.1c00390 |
| Popis: | In this work, we explain the origin and the mechanism responsible for the strong enhancement of the Raman signal of sulfur chains encapsulated by single-wall carbon nanotubes by running resonance Raman measurements in a wide range of excitation energies for two nanotube samples with different diameter distributions. The Raman signal associated with the vibrational modes of the sulfur chain is observed when it is confined by small-diameter metallic nanotubes. Moreover, a strong enhancement of the Raman signal is observed for excitation energies corresponding to the formation of excited nanotube-chain-hybrid electronic states. Our hypothesis was further tested by high pressure Raman measurements and confirmed by density functional theory calculations of the electronic density of states of hybrid systems formed by sulfur chains encapsulated by different types of single-wall carbon nanotubes. |
| Databáze: | OpenAIRE |
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