Photonic Sorting of Aligned, Crystalline Carbon Nanotube Textiles
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Bulmer, J. (2017). Photonic Sorting of Aligned, Crystalline Carbon Nanotube Textiles. Scientific Reports, 7 (12977)https://doi.org/10.1038/s41598-017-12605-y
Floating catalyst chemical vapor deposition uniquely generates aligned carbon nanotube (CNT) textiles with individual CNT lengths magnitudes longer than competing processes, though hindered by impurities and intrinsic/extrinsic defects. We present a photonic-based post-process, particularly suited for these textiles, that selectively removes defective CNTs and other carbons not forming a threshold thermal pathway. In this method, a large diameter laser beam rasters across the surface of a partly aligned CNT textile in air, suspended from its ends. This results in brilliant, localized oxidation, where remaining material is an optically transparent film comprised of few-walled CNTs with profound and unique improvement in microstructure alignment and crystallinity. Raman spectroscopy shows substantial D peak suppression while preserving radial breathing modes. This increases the undoped, specific electrical conductivity at least an order of magnitude to beyond that of single-crystal graphite. Cryogenic conductivity measurements indicate intrinsic transport enhancement, opposed to simply removing nonconductive carbons/residual catalyst.
We acknowledge the Engineering and Physical Sciences Research Council (EPSRC) grant, “Instrumentation and Control of Carbon Nanotube Fibre Manufacture” reference number EP/M02086X/1.
External DOI: https://doi.org/10.1038/s41598-017-12605-y
This record's URL: https://www.repository.cam.ac.uk/handle/1810/268174
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