期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 925, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166634
关键词
Carbon Nanotubes; Electrical conductivity; Floating Catalyst Chemical Vapour Deposition; Heat shrink tubes
资金
- Department of Science and Technology (DST) , India [IF170535]
- CSIR, India as CSIR Young Scientist Award Project on Direct synthesis of CNT Yarn
A novel precursor purging system for synthesis of carbon nanotubes with uniform diameter distribution is designed and examined. The synthesized carbon nanotubes exhibit low sulphur impurities and high electrical conductivity, making them suitable for various high-profile applications.
Taking hardware complexity into consideration of traditional continuous precursor purging systems for synthesis of few wall carbon nanotubes (CNTs) is a big challenge. Therefore, a novel precursor purging system for aerosol formation is designed to achieve uniform diameter distribution of CNTs, with the aerosol flow rate controlled either by number of ultrasonic mist makers or flow rate of carrier gas. Large droplets are turned into aerosol via an as-customized mist-producing system without the use of temperature or any chemical reaction. A built-in atomized gas valve is used to introduce the aerosol into a floating catalyst chemical vapour deposition (FCCVD) reactor. After an influential comparison of as-customized purging systems to the mostly used complex and big-budget systems for uniform diameter distribution, the quality of these CNT assemblies, synthesized using two different carrier gases (argon and hydrogen) is examined. Herein, CNT sheets with mostly fewer walls CNTs (diameter 2-10 nm) have been synthesized using this approach, with the controlled size of catalyst nanoparticles, under H-2 atmosphere exhibiting low sulphur impurities, as evidenced by Raman, EDS, and XPS spectra, and have a fourteen-fold greater electrical conductivity (5.78 x 10(4)S/m) than those synthesized under Ar atmosphere. Moreover, these sheets are also twisted and wrapped by insulating heat shrink tubes. The maximum current density of these conducting CNT wires having 250 mu m diameter is 8.15 x 10(6)A/m(2). Further, one of the domestic applications of LED bulb (3-45 W) lightning is also demonstrated which shows the suitability of these conducting wires in numerous hi-profile applications. (c) 2022 Elsevier B.V. All rights reserved.
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