High electrical conductivity of double-walled carbon nanotube fibers by hydrogen peroxide treatments
High electrical conductivity of double-walled carbon nanotube fibers by hydrogen peroxide treatments
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DOI：
10.1039/c5ta06662j
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Dresselhaus, M. S.
中科院分区：
文献类型：
--
作者：
Morelos-Gomez, A.;Fujishige, M.;Dresselhaus, M. S.
双壁碳纳米管（DWNT）纤维由于其电性能和重量轻而引起极大的兴趣，使其对工业应用具有吸引力，包括其在输电线路中的潜在用途。在这里，我们提出了一个详细的研究机制，过氧化氢（H2O2）处理提高电传输的DWNT纤维。将这些纤维浸入H2O2中并超声处理数小时。实验结果表明，残余的H2O2可以插层在管间通道内的DWNTs的束，和氧化处理也可以导致在小直径的碳纳米管（CNTs）的去除。此外，纤维密度的增加导致电阻率的降低。H2O2处理的DWNT纤维导致在金属的温度依赖的电阻率行为与过渡到一个类似的行为低于30 K。我们比较了H2O2与其他常用的溶剂和添加剂的影响，以降低碳纳米管纤维的电阻率，并发现在我们的研究中观察到的电导率值与亚硫酰氯和碘添加剂所获得的一样好。H2O2方法也用于处理其他形式的碳，其中仅掺杂有氮的多壁碳纳米管表现出电阻率的降低。该制备方法简单、高效、成本低，是制备导电碳纳米管纤维的理想方法。
Double-walled carbon nanotube (DWNT) fibers are of great interest due to their electrical properties and light weight, making them attractive for industrial applications including their potential use in power transmission lines. We present here a detailed study of the mechanism by which hydrogen peroxide (H2O2) treatment improves the electrical transport of DWNT fibers. These fibers were immersed and sonicated in H2O2 for several hours. Experimental results suggest that residual H2O2 could be intercalated within intertube channels inside the bundles of DWNTs, and the oxidation treatment could also result in the removal of small diameter carbon nanotubes (CNTs). In addition, an increase in the fiber density resulted in a decrease of the electrical resistivity. The H2O2 treatment of the DWNT fibers resulted in a metallic-like temperature dependent resistivity behavior with a transition to a semiconducting-like behavior below 30 K. We compared the effects of H2O2 with other well-known solvents and additives commonly used to reduce the carbon nanotube fiber electrical resistivity and found that the electrical conductivity values observed in our study are as good as those obtained with thionyl chloride and iodine additives. The H2O2 method was also used to treat other forms of carbon, where only the multi-walled carbon nanotubes doped with nitrogen exhibited a decrease in electrical resistivity. The fabrication method presented here is simple, efficient and low cost, thus making it an ideal process to be applied in the fabrication of electrically conducting carbon nanotube fibers.