利用透射电镜(TEM)原位观察了一端固定一端自由和两端固定的单壁碳纳米管(SWNT(s))在电子束辐照下的结构不稳定性.研究发现,一端固定一端自由的SWNT优先轴向和径向收缩后颈缩,最后形成一个个碳笼紧密相连的收缩结构("碳笼-碳笼"结构);两端固定的SWNT仅径向收缩后颈缩,最后形成许多碳笼相连的类似结构.此外,后者在电子束辐照下断开后又会重新粘合起来,表现出很强的表面塑性流变或湿润效应.这些电子束辐照诱导SWNTs非热激活结构不稳定性现象可以用我们最近提出的表面纳米曲率效应和能量束超快诱导软模和点阵失稳进行全新、全面、正确的解释.
参考文献
| [1] | Iijima S .Helical microtubules of graphitic carbon[J].Nature,1991,354(6348):56-58. |
| [2] | Ajayan P M;Colliex C;Bernier P et al.Shape transfor-mations in single-layer carbon nanotubes[J].Mierosc Microanal Mierostruet,1993,4(66):501-504. |
| [3] | Kiang C H;Goddard W A;Beyers R et al.Structural modification of single-layer carbon nanotubes with an electron beam[J].Journal of Physical Chemistry,1996,100(09):3749-3752. |
| [4] | Ajayan PM.;Charlier JC.;Ravikumar V. .Surface reconstructions and dimensional changes in single-walled carbon nanotubes[J].Physical review letters,1998(7):1437-1440. |
| [5] | Banhart F. .Irradiation effects in carbon nanostructures [Review][J].Reports on Progress in Physics,1999(8):1181-1221. |
| [6] | Zhang Y;Iijirna S .Microstructural evolution of single-walled carbon nanotubes under electron irradiation[J].Philoso Mag Lett,2000,80(06):427-433. |
| [7] | Terrones M;Terrones H;Banhart F et al.Coalescence of single-walled carbon nanotubes[J].Science,2000,288(5469):1226-1229. |
| [8] | Brian W. Smith;David E. Luzzi .Electron irradiation effects in single wall carbon nanotubes[J].Journal of Applied Physics,2001(7):3509-3515. |
| [9] | Terrones M.;Banhart F.;Grobert N.;Charlier JC.;Terrones H.;Ajayan PM. .Molecular junctions by joining single-walled carbon nanotubes - art. no. 075505[J].Physical review letters,2002(7):5505-0. |
| [10] | Hashimoto A;Suenaga K;Gloter A et al.Direct evidence for atomic defects in grapheme layers[J].Nature,2004,430(7002):870-873. |
| [11] | Mina Yoon;Seungwu Han;Gunn Kim;Sang Bong Lee;Savas Berber;Eiji Osawa;Jisoon Ihm;Mauricio Terrones;Florian Banhart;Jean-Christophe Charlier;Nicole Grobert;Humberto Terrones;Pulickel M. Ajayan;David Tomanek .Zipper Mechanism of Nanotube Fusion: Theory and Experiment[J].Physical review letters,2004(7):075504.1-075504.4. |
| [12] | Xianfang Zhu;Zhanguo Wang .Nanoinstabilities as revealed by shrinkage of nanocavities in silicon during irradiation[J].International Journal of Nanotechnology,2006(4):492-516. |
| [13] | Zhu X F .Shrinkage of nanoeavities in silicon during electron beam irradiation[J].Journal of Applied Physiology,2006,100(03):034304-1-034304-4. |
| [14] | Zhu XF. .Evidence of an antisymmetry relation between a nanocavity and a nanoparticle: a novel nanosize effect[J].Journal of Physics. Condensed Matter,2003(17):L253-L261. |
| [15] | Zhu XF;Wang ZG .Evidence of ultrafast energy exchange-induced soft'mode of phonons and lattice instability: a nanotime effect[J].Chinese physics letters,2005(3):737-740. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%