Photonic Sorting of Aligned, Crystalline Carbon Nanotube Textiles.
Photonic Sorting of Aligned, Crystalline Carbon Nanotube Textiles.
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DOI:
10.1038/s41598-017-12605-y
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发表时间:
2017-10-11
影响因子:
4.6
通讯作者:
O'Neill W
中科院分区:
文献类型:
--
作者:
Bulmer JS;Gspann TS;Orozco F;Sparkes M;Koerner H;Di Bernardo A;Niemiec A;Robinson JWA;Koziol KK;Elliott JA;O'Neill W
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.
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