Time-Resolved Raman Scattering in Exfoliated and CVD Graphene Crystals,The Journal of Physical Chemistry C

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Time-Resolved Raman Scattering in Exfoliated and CVD Graphene Crystals
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.jpcc.1c05469
Stavros Katsiaounis _{1,

2} , Andrey V. Sharkov ₃ , Eugeniy V. Khoroshilov ₃ , Georgios Paterakis _{1,

4} , John Parthenios ₁ , Konstantinos Papagelis _{1,

5}

Affiliation

Phonon lifetimes are fundamental physical parameters playing a significant role in phonon transport and thermal conductivity of two-dimensional materials. We employed the time-resolved incoherent anti-Stokes Raman scattering (TRIARS) technique to capture the G phonon dynamics and to extract the G phonon lifetimes in supported exfoliated and polycrystalline chemical vapor deposited (CVD) graphene samples of various thickness. We have found that substrate reduces considerably the G phonon lifetime of exfoliated monolayer graphene while the corresponding lifetimes for bilayer and trilayer converge gradually close to that of graphite. The lifetimes of CVD monolayers are systematically lower than exfoliated ones mainly due to the presence of various types of structural defects. Besides, the electron–phonon coupling strength of graphite is determined to be 10.6 cm^–1, in excellent agreement with theoretical predictions for graphene, justifying that the lifetimes of suspended graphene and graphite are similar.

中文翻译：

剥离和 CVD 石墨烯晶体中的时间分辨拉曼散射

声子寿命是基本物理参数，在二维材料的声子传输和热导率中起着重要作用。我们采用时间分辨非相干反斯托克斯拉曼散射 (TRIARS) 技术来捕获 G 声子动力学并提取各种厚度的支撑剥离和多晶化学气相沉积 (CVD) 石墨烯样品中的 G 声子寿命。我们发现基底显着降低了剥离单层石墨烯的 G 声子寿命，而双层和三层的相应寿命逐渐接近石墨的寿命。CVD 单层的寿命系统地低于剥落的单层，主要是由于存在各种类型的结构缺陷。除了，^–1，与石墨烯的理论预测非常一致，证明悬浮石墨烯和石墨的寿命相似。

更新日期：2021-09-30

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