High throughput production of single-wall carbon nanotube fibres independent of sulfur-source
| Autor: | Adarsh Kaniyoor, James A. Elliott, Alan H. Windle, Jenifer Mizen, Bill O’Neill, Giorgio Divitini, Jeronimo Terrones, John S. Bulmer, Thurid Gspann, Cesar Miranda-Reyes, James Ryley, Martin Sparkes, Patrick J. Kiley |
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| Přispěvatelé: | Kaniyoor, Adarsh [0000-0001-5851-1362], Divitini, Giorgio [0000-0003-2775-610X], O'Neill, William [0000-0002-7910-0455], Elliott, James [0000-0002-4887-6250], Apollo - University of Cambridge Repository |
| Rok vydání: | 2019 |
| Předmět: |
Nanotube
Thermogravimetric analysis Materials science Population 4001 Aerospace Engineering Bioengineering 02 engineering and technology Carbon nanotube Chemical vapor deposition 010402 general chemistry 01 natural sciences law.invention symbols.namesake law Genetics Nanotechnology General Materials Science 4018 Nanotechnology education 40 Engineering education.field_of_study FOS: Nanotechnology 021001 nanoscience & nanotechnology 0104 chemical sciences Volumetric flow rate Chemical engineering FOS: Biological sciences symbols Particle 0210 nano-technology Raman spectroscopy |
| Zdroj: | Nanoscale. 11(39) |
| ISSN: | 2040-3372 |
| Popis: | Floating catalyst chemical vapor deposition (FC-CVD) methods offer a highly scalable strategy for single-step synthesis and assembly of carbon nanotubes (CNTs) into macroscopic textiles. However, the non-uniform axial temperature profile of a typical reactor, and differing precursor breakdown temperatures, result in a broad distribution of catalyst particle sizes. Spun CNT fibres therefore contain nanotubes with varying diameters and wall numbers. Herein, we describe a general FC-CVD approach to obtain relatively large yields of predominantly single-wall CNT fibres, irrespective of the growth promoter (usually a sulfur compound). By increasing carrier gas (hydrogen) flow rate beyond a threshold whilst maintaining a constant C : H2 mole ratio, CNTs with narrower diameters, a high degree of graphitization (G : D ratio ∼100) and a large throughput are produced, provided S : Fe ratio is sufficiently low. Analysis of the intense Raman radial breathing modes and asymmetric G bands, and a shift in the main nanotube population from thermogravimetric data, show that with increasing flow rate, the fibres are enriched with small diameter, metallic CNTs. Transmission electron microscopy corraborates our primary observation from Raman spectroscopy that with high total flow rates, the fibres produced consist of predominantly small diameter SWCNTs. |
| Databáze: | OpenAIRE |
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