Thermal diffusivity of few-layers graphene measured by an all-optical method
| Autor: | J L Benítez, C Bautista Flores, Humberto Cabrera, Ernesto Marín, D Mendoza, S. Alvarado |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Acoustics and Ultrasonics business.industry Graphene Chemical vapor deposition Condensed Matter Physics Thermal diffusivity Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Lens (optics) Surface coating Optics Optical microscope law Microscopy Coaxial business |
| Zdroj: | Journal of Physics D: Applied Physics. 48:465501 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | We report on the measurement of the thermal diffusivity, D, of few-layers graphene obtained by chemical vapor deposition, using a noncontact optical microscopy method based on a mode mismatched thermal lens technique in a pump-probe two-laser beams configuration. It takes advantage of the coaxial counter propagating tightly focused excitation and collimated probe beams in an improved thermal lens microscopy setup. The obtained results: D = (6.5 ± 0.09) × 10−4 m2 s−1, D = (1.9 ± 0.07) × 10−4 m2 s−1 and D = (1.3 ± 0.05) × 10−4 m2 s−1 for four (on a glass slide), eight and sixteen graphene (freestanding) layers are reasonable values, as can be concluded from reported literature data. |
| Databáze: | OpenAIRE |
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