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Raman Spectral Band Oscillations in Large Graphene Bubbles

Raman spectra of large graphene bubbles showed size-dependent oscillations in spectral intensity and frequency, which originate from optical standing waves formed in the vicinity of the graphene surface. At a high laser power, local heating can lead to oscillations in the Raman frequency and also cr...

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Published in:	Physical review letters 2018-05, Vol.120 (18), p.186104-186104, Article 186104
Main Authors:	Huang, Yuan, Wang, Xiao, Zhang, Xu, Chen, Xianjue, Li, Baowen, Wang, Bin, Huang, Ming, Zhu, Chongyang, Zhang, Xuewei, Bacsa, Wolfgang S, Ding, Feng, Ruoff, Rodney S
Format:	Article
Language:	English
Subjects:	Bubbles Condensed Matter Graphene High temperature effects Hydrogen plasma Laser beam heating Materials Science Organic chemistry Oscillations Physics Raman spectra Standing waves Temperature distribution Temperature gradients Thermal conductivity
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creator	Huang, Yuan Wang, Xiao Zhang, Xu Chen, Xianjue Li, Baowen Wang, Bin Huang, Ming Zhu, Chongyang Zhang, Xuewei Bacsa, Wolfgang S Ding, Feng Ruoff, Rodney S
description	Raman spectra of large graphene bubbles showed size-dependent oscillations in spectral intensity and frequency, which originate from optical standing waves formed in the vicinity of the graphene surface. At a high laser power, local heating can lead to oscillations in the Raman frequency and also create a temperature gradient in the bubble. Based on Raman data, the temperature distribution within the graphene bubble was calculated, and it is shown that the heating effect of the laser is reduced when moving from the center of a bubble to its edge. By studying graphene bubbles, both the thermal conductivity and chemical reactivity of graphene were assessed. When exposed to hydrogen plasma, areas with bubbles are found to be more reactive than flat graphene.
doi_str_mv	10.1103/physrevlett.120.186104
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subjects	Bubbles Condensed Matter Graphene High temperature effects Hydrogen plasma Laser beam heating Materials Science Organic chemistry Oscillations Physics Raman spectra Standing waves Temperature distribution Temperature gradients Thermal conductivity
title	Raman Spectral Band Oscillations in Large Graphene Bubbles
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