Linear carbon chains inside multi-walled carbon nanotubes: Growth mechanism, thermal stability and electrical properties
Linear carbon chains inside multi-walled carbon nanotubes: Growth mechanism, thermal stability and electrical properties
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DOI：
10.1016/j.carbon.2016.05.069
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发表时间：
2016-10
期刊：
影响因子：
10.9
通讯作者：
Cheon-Soo Kang;K. Fujisawa;Yong-il Ko;H. Muramatsu;T. Hayashi;M. Endo;H. Kim;Daun Lim;Jin Hee Kim;Y. Jung;M. Terrones;M. Dresselhaus;Y. Kim
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文献类型：
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作者：
Cheon-Soo Kang;K. Fujisawa;Yong-il Ko;H. Muramatsu;T. Hayashi;M. Endo;H. Kim;Daun Lim;Jin Hee Kim;Y. Jung;M. Terrones;M. Dresselhaus;Y. Kim
由sp杂化碳原子组成的线性碳链（linear carbon chains，LCC）被认为是一个迷人的一维体系，由于其理想的线性原子性质，有望用于下一代分子器件的制备。采用大气压电弧放电法，在硼的存在下，在多壁碳纳米管（MWCNTs）内合成了大量的长形LCC。多壁碳纳米管在电弧过程中的闭端生长被认为是在碳纳米管的内核内同时生长LCC的关键条件。使用1850 cm-1附近的强拉曼谱线来表征填充度以及它们在高温热处理下的结构稳定性。我们观察到一个独特的变化之前和之后的LCC的消失，由于预期的LCC和最里面的管之间的强耦合相互作用的多壁碳纳米管组件的电导率。这项工作首次证明了受限线性碳链对多壁碳纳米管组件整体电导率的增强作用。
Linear carbon chains (LCCs) consisting ofsp-hybridized carbon atoms are considered a fascinating 1D system and could be used in the fabrication of the next-generation molecular devices because of its ideal linear atomic nature. A large portion of long LCCs inside multi-walled carbon nanotubes (MWCNTs) were synthesized by atmospheric arc discharge in the presence of boron. Closed-end growth of MWCNTs in the arc process is suggested as a critical condition for the simultaneous growth of LCCs within the inner cores of carbon nanotubes. The strong Raman line around 1850 cm−1was used to characterize the degree of filling as well as their structural stability under high temperature thermal treatments. We observed a distinctive change in the electrical conductivity of the MWCNT assembly before and after the disappearance of LCCs due to the expected strong coupling interaction between the LCCs and the innermost tube. This work demonstrates for the first time the enhanced effect of confined linear carbon chains on the overall electrical conductivity of MWCNT assemblies.