Super-robust, lightweight, conducting carbon nanotube blocks cross-linked by de-fluorination
Super-robust, lightweight, conducting carbon nanotube blocks cross-linked by de-fluorination
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DOI：
10.1021/nn700324z
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发表时间：
2008-02-01
期刊：
影响因子：
17.1
通讯作者：
Tohji, Kazuyuki
中科院分区：
文献类型：
--
作者：
Sato, Yoshinori;Ootsubo, Makoto;Tohji, Kazuyuki
以含氟多壁碳纳米管为原料，采用真空加热法和压缩法制备了无粘结剂的多壁碳纳米管大块。这种技术导致了通过引入Sp(3)杂化碳原子而产生的共价多壁碳纳米管网络的形成，这些碳原子在脱氟时在纳米管之间交联。制得的碳纳米管块比石墨轻，可加工和抛光，平均弯曲强度为102.2兆帕，弯曲模数为15.4GPA，电导率为2.1X10(2)S/厘米。尽管每个纳米管在这些块中都表现出随机结构，但其机械性能是商业石墨的3倍。在理论分子动力学模拟的基础上，提出了纳米管脱氟互连机理的模型。
We produced large binder-free multi-walled carbon nanotube (MWNT) blocks from fluorinated MWNTs using thermal heating and a compressing method in vacuo. This technique resulted in the formation of covalent MWNT networks generated by the introduction of Sp(3)-hybridized carbon atoms that cross-link between nanotubes upon de-fluorination. The resulting carbon nanotube blocks are lighter than graphite, can be machined and polished, and possess average bending strengths of 102.2 MPa, a bending modulus of 15.4 GPa, and an electrical conductivity of 2.1 X 10(2) S/cm. Although each nanotube exhibits a random structure in these blocks, the mechanical properties are 3 times higher than those obtained for commercial graphite. On the basis of theoretical molecular dynamics simulations, a model is presented for the nanotube interconnecting mechanism upon de-fluorination.