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Highly conductive CNT aerogel synthesized via an inert FC-CVD technique: a step towards a greener approach
Reaction Chemistry & Engineering ( IF 3.9 ) Pub Date : 2022-07-04 , DOI: 10.1039/d2re00170e
Manoj Sehrawat , Mamta Rani , Pallvi Dariyal , Sony Bharadwaj , S. R Dhakate , Bhanu Pratap Singh

Floating catalyst chemical vapor deposition (FC-CVD) is a promising and viable technique for scalability and continuous synthesis of carbon nanotube (CNT) macroassemblies through a single gas phase pyrolysis process. However, progress towards commercialization has been slow due to its multidimensionality of parameter space. Moreover, this synthesis route deploys hydrogen gas, which invokes safety concerns due to its reactivity and explosiveness. Therefore, in this study, we undertook a greener approach and synthesized a highly crystalline and conductive CNT network under an inert atmosphere maintained by argon through a systematic parametric study of its flow rates inside the synthesis reactor. Lower gas flow rates resulted in higher IG/ID values, thermal stabilities, and electrical conductivities at 4.8, 611 °C, and 4.77 × 104 S m−1, respectively, for 250 sccm of argon flow. These results have been duly correlated with gas chemistry during the synthesis, which employed various chemical reactions that augmented the supply of hydrogen gas, leading to improved properties of the final product. Site-specific evaluation of the final products indicated that the difference in quality resulted from the difference in their respective reducing atmosphere. Therefore, this study utilized in situ-produced hydrogen gas for enhancing the structural and electrical properties of CNTs without an external hydrogen gas supply, which is a step forward towards the green synthesis of CNT macroassemblies.

中文翻译:

通过惰性 FC-CVD 技术合成的高导电 CNT 气凝胶:迈向更环保的一步

浮动催化剂化学气相沉积 (FC-CVD) 是一种有前途且可行的技术,可通过单一气相热解过程进行可扩展性和连续合成碳纳米管 (CNT) 大组件。然而,由于其参数空间的多维性,商业化进展缓慢。此外,该合成路线使用氢气,由于其反应性和爆炸性,引发了安全问题。因此,在本研究中,我们采用了一种更环保的方法,通过对合成反应器内流速的系统参数研究,在氩气维持的惰性气氛下合成了一种高度结晶和导电的 CNT 网络。较低的气体流速导致较高的I G / I D对于 250 sccm 的氩气流量,分别在 4.8、611 °C 和 4.77 × 10 4 S m -1下的值、热稳定性和电导率。这些结果与合成过程中的气体化学充分相关,合成过程采用了各种化学反应,增加了氢气的供应,从而改善了最终产品的性能。对最终产品的现场特定评估表明,质量差异是由于它们各自的还原气氛不同造成的。因此,本研究利用原位产生的氢气来增强 CNT 的结构和电学性能,而无需外部氢气供应,这是朝着绿色合成 CNT 大组件迈出的一步。
更新日期:2022-07-04
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