Department of Mechanical Engineering, National University of Singapore , 9 Engineering Drive 1, EA-07-05, Singapore 117575, Singapore.
Department of Chemistry, Department of Chemical & Biomolecular Engineering, and Department of Materials Science & NanoEngineering, The Smalley Institute for Nanoscale Science & Technology, Rice University , Houston, Texas 77005, United States.
ACS Appl Mater Interfaces. 2017 Oct 25;9(42):37112-37119. doi: 10.1021/acsami.7b09287. Epub 2017 Oct 11.
In this study, we apply a simple but effective oxidative purification method to purify carbon nanotube (CNT) fibers synthesized via a floating catalyst technique. After the purification treatment, the resulting CNT fibers exhibited significant improvements in mechanical and electrical properties with an increase in strength, Young's modulus, and electrical conductivity by approximately 81, 230, and 100%, respectively. With the successful dissolution of the CNT fibers in superacid, an extensional viscosity method could be applied to measure the aspect ratio of the CNTs constituting the fibers, whereas high-purity CNT thin films could be produced with a low resistance of 720 Ω/sq at a transmittance of 85%. This work suggests that the oxidative purification approach and dissolution process are promising methods to improve the purity and performance of CNT macroscopic structures.
在这项研究中，我们应用了一种简单而有效的氧化净化方法，来净化通过浮动催化剂技术合成的碳纳米管（CNT）纤维。经过净化处理后，所得的 CNT 纤维的机械和电学性能有显著提高，强度、杨氏模量和电导率分别提高了约 81%、230%和 100%。通过 CNT 纤维在超酸中的成功溶解，可以应用拉伸黏度法来测量构成纤维的 CNT 的纵横比，而通过低电阻（720 Ω/sq）和高透光率（85%），可以生产出高纯度的 CNT 薄膜。这项工作表明，氧化净化方法和溶解过程是提高 CNT 宏观结构的纯度和性能的有前途的方法。
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