Probing strain on graphene flake using polarized Raman spectroscopy
Probing strain on graphene flake using polarized Raman spectroscopy
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DOI：
10.1016/j.apsusc.2015.01.094
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发表时间：
2015-03
影响因子：
6.7
通讯作者：
Sean Sung-Yen Juang;Chih‐Yi Liu;Cheng-wen Huang;Joseph Hua Hsieh Liao;Ting-Chun Wang;Y. Yu;Hsiang‐Chen Chui
中科院分区：
文献类型：
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作者：
Sean Sung-Yen Juang;Chih‐Yi Liu;Cheng-wen Huang;Joseph Hua Hsieh Liao;Ting-Chun Wang;Y. Yu;Hsiang‐Chen Chui
本文提出了一种利用双激发源偏振拉曼光谱和线形分析测量石墨烯表面应变的方法，并利用它研究了金纳米颗粒对石墨烯薄片的应变效应。表面增强拉曼光谱（SERS）可以有效地增强拉曼信号，但需要在石墨烯表面沉积金属薄膜或纳米粒子。我们使用拉曼光谱和SERS比较了拉曼信号强度，并将线形拟合到联合洛伦兹剖面中。在实验设计中，金纳米颗粒的应变效应可以忽略不计。金纳米颗粒的分布可以看作是随机的。SERS技术可以增强拉曼信号而不引起应变变化。同时，532 nm激光激发的石墨烯薄片的拉曼信号强度比632 nm激光激发的石墨烯薄片的拉曼信号强度大约10倍。我们采用了532nm激发激光的方式和SERS技术，大大提高了测量效率。
We presented an approach to measure the strain on graphene by using the polarized Raman spectroscopy with two excited sources and lineshape analysis, and studied the strain effect due to golden nanoparticles on graphene flake with it. The surface enhanced Raman spectroscopy (SERS) can effectively enhance Raman signals, but depositing metallic films or nanoparticles on graphene is needed. We compared the Raman signal intensity using Raman spectroscopy and SERS, and fitted the lineshape into the combined Lorentzian profiles. The strain effect due to golden nanoparticles can be neglected in our experimental design. The distribution of golden nanoparticles can be regarded as random. The technique of SERS can enhance Raman signal and not cause strain changing. At the same time, the Raman signal intensity of graphene flake with 532-nm laser excitation is larger than one with 632-nm laser approximately 10 times. Expectedly, we used the way of 532-nm excited laser and technique of SERS to greatly enhance measuring efficiency.