Quantitative analysis of the effect of reabsorption on the Raman spectroscopy of distinct (n, m) carbon nanotubes.,Analytical Methods

当前位置： X-MOL 学术 › Anal. Methods › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Quantitative analysis of the effect of reabsorption on the Raman spectroscopy of distinct (n, m) carbon nanotubes.
Analytical Methods ( IF 2.7 ) Pub Date : 2020-04-01 , DOI: 10.1039/d0ay00356e
Shilong Li _{1,

2,

3} , Xiaojun Wei _{1,

2,

4} , Linhai Li _{1,

2,

3} , Jiaming Cui ₁ , Dehua Yang _{1,

2,

3} , Yanchun Wang _{1,

2} , Weiya Zhou _{1,

2,

3,

4} , Sishen Xie _{1,

2,

3,

4} , Atsushi Hirano ₅ , Takeshi Tanaka ₅ , Hiromichi Kataura ₅ , Huaping Liu _{1,

2,

3,

4,

6}

Affiliation

We quantitatively analyze the effect of reabsorption on the Raman spectroscopy of (10, 3) and (8, 3) single-chirality single-wall carbon nanotube (SWCNT) solutions by varying the detection depth in confocal micro-Raman measurements and SWCNT concentration the in sample solution. The increase of the detection depth and concentration of SWCNTs enhances the reabsorption effect and decreases the intensities of the Raman features. More importantly, reabsorption exhibits different effects on different Raman features such as the radial breathing mode (RBM) and G⁺ band, strongly depending on the resonance degree of the scattered light energy and the interband transition of SWCNTs. When (10, 3) SWCNTs are excited with a 633 nm laser, the scattered light from RBM has stronger resonance with the interband transition of the SWCNTs than that from the G⁺ band, leading to a faster reduction in the RBM intensity and a lower intensity ratio of RBM to the G⁺ band. In contrast, when (8, 3) SWCNTs are excited with a 633 nm laser, reabsorption has the same effect on the RBM and G⁺ band intensities and thus maintains a constant intensity ratio of RBM to the G⁺ band. Furthermore, we precisely establish a quantitative relationship of the intensities of the Raman features such as RBM, the G⁺ band and their intensity ratio as a function of the focal depth and SWCNT concentration by theoretical calculations and numerical simulation, which reproduces the experimental results well. These results are very useful in the precise analysis of the Raman spectroscopy of SWCNTs and thus their applications in molecular detection and imaging.

中文翻译：

定量分析重吸收对不同（n，m）碳纳米管的拉曼光谱的影响。

我们通过改变共聚焦微拉曼测量中的检测深度和SWCNT浓度来定量分析重吸收对（10，3）和（8，3）单手性单壁碳纳米管（SWCNT）解决方案的拉曼光谱的影响。在样品溶液中。SWCNT的检测深度和浓度的增加增强了重吸收效果，并降低了拉曼特征的强度。更重要的是，重吸收对不同的拉曼特征（例如the气模式（RBM）和G ⁺波段，很大程度上取决于散射光能量的共振程度和SWCNT的带间跃迁。当（10，3）SWCNT被633 nm激光激发时，来自RBM的散射光与SWCNT的带间跃迁相比比来自G ⁺波段的散射光具有更强的共振，从而导致RBM强度的降低更快且更低。 RBM与G ⁺带的强度比。相反，当（8,3）的SWCNT与633纳米激光激发，重吸收对RBM和G相同的效果⁺带强度和因此保持RBM的与G的恒定强度比⁺频带。此外，我们精确地建立了诸如RBM，G ⁺通过理论计算和数值模拟得出的谱带及其强度比与焦深和SWCNT浓度的关系，很好地再现了实验结果。这些结果对于SWCNT的拉曼光谱的精确分析及其在分子检测和成像中的应用非常有用。

更新日期：2020-04-01

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11