轴向拉伸下双层石墨烯与单壁碳纳米管复合膜的光学导电性的量子研究

Q2 Physics and Astronomy
M. Slepchenkov, P. Barkov, O. Glukhova
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引用次数: 0

摘要

本文采用量子方法研究了AB堆叠双层石墨烯与直径为1.2nm的手性单壁碳纳米管(SWCNT)(12,6)形成的复合膜的光学性能。光学性质的分析是在计算0.2–2μm波长范围内复光学电导率张量对角线元素的结果的基础上进行的。考虑了电磁辐射极化的两种情况:沿X轴(沿石墨烯双层)和沿Y轴(沿纳米管轴)。对复合膜的三个拓扑模型(V1、V2、V3)进行了计算,这三个模型在石墨烯双层的宽度和石墨烯层之间的位移值方面不同。研究发现,在沿X轴偏振的情况下,在极紫外和中紫外辐射区域的光学电导率的实部轮廓由SWCNT(12,6)确定,在近紫外和可见光辐射区域,由双层石墨烯确定。在沿Y轴偏振的情况下,通过SWCNT(12,6)确定在极端、近UV和可见光辐射区域中的光学电导率的实部轮廓,并且在中UV范围的区域中,通过双层石墨烯确定。揭示了在沿Y轴拉伸变形的作用下,双层石墨烯-SWCNT(12,6)复合膜的表面电导率分布的变化规律。对于模型V1(石墨烯纳米带的宽度为0.5nm,层之间的偏移为0.48nm)和V2(石墨烯纳米带的宽度是0.71nm,层间的偏移为0.27nm),示出了极端UV辐射区域中的电导率峰值沿着波长向右偏移。对于模型V3(石墨烯纳米带的宽度为0.92nm,层之间的偏移为0.06nm),不仅在极端UV辐射区域中,而且在可见辐射区域中观察到电导率峰值沿波长向右偏移。假设具有岛状拓扑结构的石墨烯SWCNT(12,6)复合膜是紫外-可见光和近红外范围内光电探测器的有前途的材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantum Study of the Optical Conductivity of Composite Films Formed by Bilayer Graphene and Single-Walled Carbon Nanotubes under Axial Stretching
In this article, quantum methods are used to study the optical properties of composite films formed by AB-stacked bilayer graphene and chiral single-walled carbon nanotubes (SWCNT) (12, 6) with a diameter of 1.2 nm. The analysis of optical properties is carried out on the basis of the results of calculating the diagonal elements of complex optical conductivity tensor in the wavelength range of 0.2–2 μm. Two cases of electromagnetic radiation polarization are considered: along the X axis (along the graphene bilayer) and along the Y axis (along the nanotube axis). The calculations are performed for three topological models (V1, V2, V3) of composite films, which differ in the width of the graphene bilayer and in the value of the shift between graphene layers. It is found that in the case of polarization along the X axis, the profile of the real part of optical conductivity in the region of extremal and middle UV radiation is determined by SWCNT (12, 6), and in the region of near UV and visible radiations, it is determined by bilayer graphene. In the case of polarization along the Y axis, the profile of the real part of optical conductivity in the region of extremal, near UV, and visible radiation is determined by SWCNT (12, 6), and in the region of the mid-UV range, it is determined by bilayer graphene. Regularities in the change in the profile of the surface optical conductivity of bilayer graphene-SWCNT (12,6) composite films under the action of stretching deformation along the Y axis are revealed. For models V1 (width of the graphene nanoribbon is 0.5 nm, the shift between layers is 0.48 nm) and V2 (width of the graphene nanoribbon is 0.71 nm, the shift between layers is 0.27 nm), the shift of the conductivity peaks in the region of extreme UV radiation along the wavelength to the right is shown. For the model V3 (width of the graphene nanoribbon is 0.92 nm, the shift between layers is 0.06 nm), the shift of the conductivity peaks to the right along the wavelength is observed not only in the region of extreme UV radiation, but also in the region of visible radiation. It is assumed that graphene-SWCNT (12,6) composite films with island topology are promising materials for photodetectors in the UV-visible and near-IR ranges.
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来源期刊
Quantum Reports
Quantum Reports Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
3.30
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0.00%
发文量
33
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10 weeks
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