Anti-Stokes Raman Scattering and Luminescence in Carbon Nanotube Nanostructures
| Autor: | Florian Massuyeau, Serge Lefrant, J. Wery, Ioan Baltog, Jean-Yves Mevellec, Mihaela Baibarac, Jean-Pierre Buisson |
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| Přispěvatelé: | Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Lab. Optics and Spectroscopy, Bucharest, Université de Bucarest |
| Rok vydání: | 2012 |
| Předmět: |
Raman scattering
Materials science Carbon nanotubes Analytical chemistry Nanoprobe hybrid carbon nanotube/conjugated polymer materials macromolecular substances 02 engineering and technology Carbon nanotube 01 natural sciences Molecular physics law.invention symbols.namesake law 0103 physical sciences natural sciences General Materials Science cardiovascular diseases Coherent anti-Stokes Raman spectroscopy 010306 general physics CARS emission technology industry and agriculture General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics respiratory tract diseases Optical properties of carbon nanotubes X-ray Raman scattering [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] symbols 0210 nano-technology Raman spectroscopy Luminescence |
| Zdroj: | Molecular Crystals and Liquid Crystals Molecular Crystals and Liquid Crystals, Taylor & Francis, 2012, 554, pp.111. ⟨10.1080/15421406.2012.633816⟩ |
| ISSN: | 1563-5287 1542-1406 |
| DOI: | 10.1080/15421406.2012.633816 |
| Popis: | International audience; In this paper, we present recent results obtained on single-walled carbon nanotubes (SWNTs) and carbon nanotube/conjugated polymer composites by using resonant Raman scattering and Surface Enhanced Raman Scattering (SERS). Besides the characterization of these materials, we report on peculiar properties observed in the anti-Stokes Raman branch of the Raman spectra. They consist in an abnormal anti-Stokes Raman emission which is explained by a mechanism reminiscent of a Coherent anti-Stokes Raman Scattering (CARS) emission. It results from a wave mixing process between the incident laser light and Stokes Raman light, generated by the SERS mechanism. In a parallel way, we have investigated in details the resonance effects which also induce anomalies in the anti-Stokes/Stokes intensity ratios, as a function of several parameters including the observation temperature, the environmental conditions, the dilution in solvents, etc. Studies extended to composites based on carbon nanotubes and conjugated polymers reveal also interesting properties. In the case of poly(bithiophene) (PBTh), one observes a strong amplification of the 1450 cm−1 Raman line in the anti-Stokes branch, generated by the plasmon excitation of metallic tubes. This phenomenon occurs in several other conjugated polymers such as PEDOT and PPV for modes located around 1500 cm−1. The role of metallic SWNTs is discussed. Finally, an anti-Stokes luminescence excited in the low energy tail of the absorption band of PPV and PPV/SWNTs composites has even been observed for the first time, explained through a phonon-energy up-conversion mechanism. |
| Databáze: | OpenAIRE |
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