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Influence of chirality on the thermal conductivity of single-walled carbon nanotubes
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作者 冯雅 祝捷 唐大伟 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第8期310-316,共7页
The influence of chirality on the thermal conductivity of single-walled carbon nanotubes (SWNTs) is discussed in this paper, using a non-equilibrium molecular dynamics (NEMD) method. The tube lengths of the SWNTs ... The influence of chirality on the thermal conductivity of single-walled carbon nanotubes (SWNTs) is discussed in this paper, using a non-equilibrium molecular dynamics (NEMD) method. The tube lengths of the SWNTs studied here are 20, 50, and 100 nm, respectively, and at each length the relationship between chiral angle and thermal conductivity of a SWNT is revealed. We find that if the tube length is relatively short, the influence of chirality on the thermal conductivity of a SWNT is more obvious and that a SWNT with a larger chiral angle has a greater thermal conductivity. Moreover, the thermal conductivity of a zigzag SWNT is smaller than that of an armchair one. As the tube length becomes longer, the thermal conductivity increases while the influence of chirality on the thermal conductivity decreases. 展开更多
关键词 single-walled carbon nanotube thermal conductivity chiral angle molecular dynamics simulation
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Temperature Dependent Resistivity of Chiral Single-Walled Carbon Nanotubes in the Presence of Coherent Light Source
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作者 Anthony Twum Raymond Edziah +6 位作者 Samuel Yeboah Mensah Kwadwo Dompreh Patrick Mensah-Amoah Augustine Arthur Natalia G. Mensah Kofi Adu George Nkrumah-Buandoh 《World Journal of Condensed Matter Physics》 CAS 2021年第4期77-86,共10页
We have studied the axial resistivity of chiral single-walled carbon nanotubes (SWCNTs) in the presence of a combined direct current and high frequency alternating fields. We employed semiclassical Boltzmann equations... We have studied the axial resistivity of chiral single-walled carbon nanotubes (SWCNTs) in the presence of a combined direct current and high frequency alternating fields. We employed semiclassical Boltzmann equations approach and compared our results with a similar study that examined the circumferential resistivity of these unique materials. Our work shows that these materials display similar resistivity for both axial and circumferential directions and this largely depends on temperature, intensities of the applied fields and material parameters such as chiral angle. Based on these low-temperature bidirectional conductivity responses, we propose chiral SWCNTs for design of efficient optoelectronic devices. 展开更多
关键词 chiral Single-Wall Carbon Nanotubes Boltzmann Transport Equation Axial Resistivity chiral angle
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Nonlinear Refractive Index and Absorption Coefficient of Single-Shell Semiconductor Carbon Nanotube
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作者 Lu Ni,Xiong Gui\|guang School of Physics and Technology, Wuhan University, Wuhan 430072, Hubei, China 《Wuhan University Journal of Natural Sciences》 CAS 2003年第03A期833-836,共4页
The nonlinear refractive index and absorption coefficient of single\|shell semiconductor carbon nanotubes(CN s ) are calculated based on the two\|band approximation and Genkin\|Mednis approach. The results of nonlin... The nonlinear refractive index and absorption coefficient of single\|shell semiconductor carbon nanotubes(CN s ) are calculated based on the two\|band approximation and Genkin\|Mednis approach. The results of nonlinear refractive index and absorption coefficient reach the order of 10 -8 and 10 -4 cm 2\5W -1 separately, which indicates that CN s have wonderful nonlinear optical properties. Taking into account the temperature effect and overlapping of σ and π orbits, the effect of relaxation term and chiral angle is discussed. The results show that the smaller the relaxation term, the larger the nonlinear absorption coefficient and refractive index. At the same time, CN s with different chiral angles have different results due to their different energy gap. 展开更多
关键词 nonlinear refractive index nonlinear absorption coefficient RELAXATION chiral angle
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