Significantly improved measurement accuracy in determining the thermal expansion coefficient of single layer graphene

被引：2
|
作者：
Li, Lingling [1 ,2 ]
Feng, Xin [1 ,2 ]
Wang, Yongkang [1 ,2 ]
Guo, Ming [1 ,2 ]
Qi, Han [1 ,2 ]
Wei, Zhiyong [1 ,2 ]
Bi, Kedong [1 ,2 ]
机构：
[1] Southeast Univ, Nano Biomed Instruments, Jiangsu Key Lab Design & Manufacture Micro, Nanjing 211189, Peoples R China
[2] Southeast Univ, Sch Mech Engn, Nanjing 211189, Peoples R China
来源：
DIAMOND AND RELATED MATERIALS | 2020年 / 109卷
基金：
中国国家自然科学基金;
关键词：
Graphene; Thermal expansion coefficient; Raman spectra; Thermal cycle; RAMAN-SPECTROSCOPY; SUSPENDED GRAPHENE; CARBON; GRAPHITE;
D O I：
10.1016/j.diamond.2020.108007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The precise thermal expansion coefficient (TEC) of single layer graphene (SLG) is of vital importance to the preparation and application of graphene-based devices. In this work, a comprehensive Raman investigation on the TECs of SLG was conducted by reducing the effects of defects, native strains, and substrate doping. The TECs of graphene with few defects extracted from Raman spectra remained negative without the appearance of a positive transition in the temperature range of 303-503 K. After eliminating the influence of native strains and substrate doping on the TEC acquisition by excluding the first thermal cycle, a more reliable TEC, (- 3.68 +/- 0.49) x 10(-6)/K, was obtained at room temperature, which was much closer to the theoretical predictions than those results in previous experimental reports. This investigation provides a more precise approach to measure the TECs of two-dimensional materials by Raman spectroscopy.
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页数：5
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