Influence of sulfur promoter on electrical conductivity in direct-spun carbon nanotube fibers

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-01-29 DOI:10.1007/s42823-025-00859-w

Ho Jun Moon, Sumin Kim, Myeong Wan Han, Yoong Ahm Kim, Moo-Sung Lee, Jong Hun Han

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Abstract

Carbon nanotube (CNT) fibers were synthesized in this study under a hydrogen atmosphere using the floating-catalyst chemical vapor deposition (CVD) technique. Acetone, ferrocene, and thiophene served as the sources of carbon, catalyst, and promoter, respectively. By adjusting the amount of thiophene, the sulfur molar ratio in the CVD reactor was varied to study its impact on the morphology and composition of the CNT fibers. Raman and TEM analyses showed that the structural properties of the CNTs, especially the production of single-walled CNTs (SWCNTs) with a high Raman I_G/I_D ratio of approximately 23.8, can be finely tuned by altering the sulfur content, which also affects the accumulation of spherical carbonaceous particles. Moreover, it was established that the electrical conductivity of the CNT fibers is significantly influenced by their specific components—SWCNTs, multi-walled CNTs (MWCNTs), and spherical carbonaceous particles. The ratios of these components can be adjusted by modifying the molar ratios of catalyst and promoter in the precursor mixture. Remarkably, SWCNTs with enhanced crystallinity were found to substantially improve the electrical conductivity of the CNT fibers, despite the presence of numerous spherical carbon impurities.

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硫促进剂对直纺碳纳米管纤维电导率的影响

采用漂浮催化剂化学气相沉积（CVD）技术在氢气气氛下合成了碳纳米管（CNT）纤维。丙酮、二茂铁和噻吩分别作为碳源、催化剂和促进剂。通过调整噻吩的用量，改变CVD反应器中硫的摩尔比，研究其对碳纳米管纤维形貌和组成的影响。拉曼和透射电镜分析表明，通过改变硫含量可以很好地调节碳纳米管的结构性质，特别是制备具有高拉曼IG/ID比（约23.8）的单壁碳纳米管（SWCNTs），硫含量也会影响球形碳质颗粒的积累。此外，研究还发现碳纳米管纤维的导电性受到其特定成分swcnts、多壁CNTs （MWCNTs）和球形碳质颗粒的显著影响。这些组分的比例可以通过改变前驱体混合物中催化剂和促进剂的摩尔比来调整。值得注意的是，尽管存在大量球形碳杂质，但结晶度增强的SWCNTs可以显著提高碳纳米管纤维的导电性。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.