High-strength and toughness CNT films from microwaving-promoted purification and structural reconstruction

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2024-09-30 DOI:10.1016/j.carbon.2024.119680

Li Yan Zhang , Yu Ting Chen , Hang Zhan , Jian Nong Wang

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Abstract

Carbon nanotube (CNT) films can now be prepared by catalytic floating chemical vapor deposition (CVD) with low cost and high yield. However, their performance deteriorates drastically due to the presence of impurities and structural defects all over the films. In this study, we report a simple and fast heating and quenching approach to tackle this issue by using a household microwave oven. Experimental results show that the strong interaction between CNTs and low-power microwaves within 10 s not only triggered the diffusion of Fe particles from the interior to the surface of the film for easy purification but also improved the graphitic structure of CNTs and their inter-tube binding for mechanical strengthening and electrical conduction. After a sequential treatment of microwaving-acid washing-microwaving, followed by additional rolling, the final CNT film exhibited a tensile strength of 7.45 GPa, an elongation at break of 11.33 %, and an electrical conductivity of 1.85 × 10⁶ S m⁻¹. The combination of such mechanical and electrical properties is superior to previous fibers and films reported in open literature. Considering its efficient and environment-friendly features, the present approach is suitable for the large-scale production of high-performance CNT films, thereby meeting the requirements for practical applications in many fields.

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微波促进纯化和结构重构的高强度和韧性 CNT 薄膜

碳纳米管（CNT）薄膜现在可以通过催化浮动化学气相沉积（CVD）法制备，成本低、产量高。然而，由于薄膜中存在杂质和结构缺陷，其性能急剧下降。在本研究中，我们利用家用微波炉报告了一种简单快速的加热和淬火方法来解决这一问题。实验结果表明，在 10 秒钟内，CNT 与低功率微波之间的强烈相互作用不仅引发了铁颗粒从薄膜内部向表面的扩散，便于提纯，而且改善了 CNT 的石墨化结构及其管间结合，增强了机械强度和导电性能。经过微波-酸洗-微波的连续处理，再经过滚压，最终的 CNT 薄膜显示出 7.45 GPa 的拉伸强度、11.33 % 的断裂伸长率和 1.85 × 106 S m-1 的导电率。这种机械和电气性能的结合优于以往公开文献中报道的纤维和薄膜。考虑到其高效、环保的特点，本方法适用于大规模生产高性能 CNT 薄膜，从而满足许多领域的实际应用要求。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.