Thermal diffusivity of few-layers graphene measured by an all-optical method. (7th October 2015)

• Record Type: Journal Article
• Authors: Cabrera, H; Mendoza, D; Benítez, J L; Bautista Flores, C; Alvarado, S; Marín, E
• Is Part Of: Journal of physics. Volume 48:Number 46(2015)
• Publication Date: 2015-10-07
• Subjects: graphene -- thermal lens -- thermal diffusivity -- photothermal; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/48/46/465501
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: 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 m 2 s −1, D = (1.9 ± 0.07) × 10 −4 m 2 s −1 and D = (1.3 ± 0.05) × 10 −4 m 2 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.