共查询到18条相似文献,搜索用时 89 毫秒
1.
碳纳米管对光的吸收与光的偏振方向有关,光偏振方向与碳纳米管管轴方向平行时光吸收最强,光偏振方向与碳纳米管管轴方向垂直时光吸收最弱。采用半经典理论处理光和碳纳米管的相互作用,计算了碳纳米管的光吸收与光偏振方向的关系,计算结果表明碳纳米管光吸收速率与COS^2θ成正比,其中θ是光偏振方向和碳纳米管轴向夹角。 相似文献
2.
3.
碳纳米管及其应用的研究现状 总被引:27,自引:0,他引:27
在世界范围内 ,碳纳米管及其应用的研究成为当前材料研究的热点。通过最近数年的研究 ,科技界对于碳纳米管的特性及应用前景有了深刻的认识。目前研究的重点集中在较大批量生产 (公斤级 /日 )和全面应用方面。 相似文献
4.
5.
碳纳米管是由单层或多层石墨片卷曲而成的无缝纳米级管状壳层结构。扼要介绍了碳纳米管、碳纳米管纤维的合成方法及近几年来国内外制备的各种碳纳米管产品。碳纳米管、碳纳米管纤维由于其优良的力学、电学特性可以制成气体吸附体、生物模板、传动装置、增强复合体、催化剂载体、探测器、传感器、纳米反应器等产品,在航空、能源、医药、化学等技术领域广泛应用。 相似文献
6.
碳纳米管是由单层或多层石墨片卷曲而成的无缝纳米级管状壳层结构.扼要介绍了碳纳米管、碳纳米管纤维的合成方法及近几年来国内外制备的各种碳纳米管产品.碳纳米管、碳纳米管纤维由于其优良的力学、电学特性可以制成气体吸附体、生物模板、传动装置、增强复合体、催化剂载体、探测器、传感器、纳米反应器等产品,在航空、能源、医药、化学等技术领域广泛应用. 相似文献
7.
碳纳米管具有管径小、长径比高的结构以及物理化学性能稳定等优良特性,被认为是真空冷阴极场发射电子源和场发射平板显示理想的阴极材料。加之碳纳米管兼具有机械强度高、韧性好等出众的力学性能,使其成为复合材料的理想添加相,将其与其他材料复合,可以制备出具有更加出众性能的复合材料。近年来有关碳纳米管及其复合材料场发射研究已成为一个备受关注的热点。概述了阴极场发射理论以及与碳纳米管场发射相关的几种场发射物理机制,介绍了碳纳米管复合场发射阴极的研究现状及制备方法,最后对碳纳米管复合阴极场发射的发展前景进行了展望。 相似文献
8.
利用ChemSketch10.0设计了一系列两端开口的有限长碳纳米管分子(n,0)(n=5-10),使用量子化学半经验AM1方法研究了分子的电子结构,并使用有限场/AM1方法计算了分子的一阶极化率、非线性光学二阶和三阶极化率。研究结果表明,两端开口的有限长碳纳米管分子最高占据轨道(HOMO)与最低空轨道(LUMO)间的能隙Eg随着管径的增大而出现随奇偶n值的振荡变化,随着管长Ⅳ的增加呈单调减小的趋势。目标分子中,管长为N=3的分子系列具有较高的二阶、三阶非线性光学极化系数β,γ,而(8,0)N=3分子具有最大的β值,(7,0)N=3分子具有最大的γ值。 相似文献
9.
介绍了在直流电弧放电法制备富勒烯过程中,从阴电极表面收集到大量的碳纳米管及巴基葱,产生率达到50%,并用电子显微镜对其进行了观察和初步研究。 相似文献
10.
11.
P. N. Gevko L. G. Bulusheva A. V. Okotrub N. F. Yudanov I. V. Yushina K. A. Grachev A. M. Pugachev N. V. Surovtsev E. Flahaut 《Fullerenes, Nanotubes and Carbon Nanostructures》2006,14(2):233-238
Double-wall carbon nanotube (DWNT) samples have been fluorinated at room temperature with varied concentration of a fluorinating agent BrF3. Content of the products estimated from X-ray photoelectron data was equal to CF0.20 and CF0.29 in the case of deficit and excess of BrF3. Raman spectroscopy showed considerable decrease of carbon nanotube amount in the fluorinated samples. Analysis of optical absorption spectra measured for pristine and fluorinated DWNT samples revealed a selectivity of carbon nanotube fluorination. Nanotubes with large chiral angle are more inert to the fluorinating agent used. 相似文献
12.
13.
This Review presents a discussion of the electromagnetic properties of nanoscale electrical conductors, which are quantum mechanical one‐dimensional systems. Of these, carbon nanotubes are the most technologically advanced example, and are discussed mainly in this paper. The properties of such systems as transmission electron microscopy waveguides for on‐chip signal propagation and also the radiation properties of such systems are discussed. This work is primarily aimed at microwave, nanometer‐wave, and THz electronics. However, the use of nanotubes as antennas in the IR and optical frequency range is not precluded on first principles and remains an open research area.
14.
15.
16.
17.
Zoheir Kordrostami Mohammad Hossein Sheikhi Reza Mohammadzadegan 《Fullerenes, Nanotubes and Carbon Nanostructures》2008,16(1):66-77
Reviewing experimental results and based on the physical reasoning, we present a basic circuit model for Multiwall carbon nanotubes (MWCNTs), which can simulate different experimental results. Investigation of different results confirms the severe effects of fabrication process (nanotube and contacts) on electronic properties of the MWCNTs. The circuit model has been developed to show the performance improvements of a CNT interconnect when the single-wall carbon nanotube (SWCNT) is replaced by an MWCNT. To calculate the current-voltage characteristic and the switching delay of MWCNTs, we have simulated their DC and AC properties, respectively, using the developed transmission line models. Based on the physical models, the elements of the circuit model can be changed so that the simulation and the practical measurements for an MWCNT can correspond. Switching Delays of the MWCNTs and SWCNTs are calculated and compared for different cases. 相似文献