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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Bibliographic Details
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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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.120.186104