Bending fracture in carbon nanotubes
Bending fracture in carbon nanotubes
复制标题
碳纳米管的弯曲断裂
DOI：
10.1088/0957-4484/19/49/495710
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发表时间：
2008
期刊：
影响因子：
3.5
通讯作者：
Hsin
中科院分区：
文献类型：
--
作者：
W. Kuo;Hsin
采用了一种新的碳纳米管弯曲断裂方法。膨胀石墨(EG)是由天然石墨片插层剥离而成。采用化学气相沉积法制备了碳纳米管，并在其表面沉积了镍颗粒。碳纳米管是尖端生长的，其根固定在EG薄片上。由于压缩诱导的弯曲，EG薄片被压缩，表面的许多碳纳米管被碎裂。观察到弯曲断裂的两种主要形式：锥形断裂和剪切断裂。用高分辨扫描电子显微镜和透射电子显微镜研究了石墨烯层内的裂纹扩展情况。弯曲断裂以两区裂纹扩展为特征。由于弯曲引起的拉应力，外管周围首先出现张开的裂纹。然后，由于石墨烯层之间存在剪应力，裂纹将沿着向内管倾斜的方向分支扩展。形成具有倾斜侧表面的内管拔出。讨论了裂纹在这两个区域的萌生和发展。
A novel approach was adopted to incur bending fracture in carbon nanotubes (CNTs). Expanded graphite (EG) was made by intercalating and exfoliating natural graphite flakes. The EG was deposited with nickel particles, from which CNTs were grown by chemical vapor deposition. The CNTs were tip-grown, and their roots were fixed on the EG flakes. The EG flakes were compressed, and many CNTs on the surface were fragmented due to the compression-induced bending. Two major modes of the bending fracture were observed: cone-shaped and shear-cut. High-resolution scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to examine the crack growth within the graphene layers. The bending fracture is characterized by two-region crack growth. An opening crack first appears around the outer-tube due to the bending-induced tensile stress. The crack then branches to grow along an inclined direction toward the inner-tube due to the presence of the shear stress in between graphene layers. An inner-tube pullout with inclined side surface is formed. The onset and development of the crack in these two regions are discussed.
通过 TEM 中的纳米探针操作表征碳纳米管
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
T.;Kuzumaki
通讯作者：
Kuzumaki