CUED Publications database

Photonic Sorting of Aligned, Crystalline Carbon Nanotube Textiles

Bulmer, J Photonic Sorting of Aligned, Crystalline Carbon Nanotube Textiles. Scientific Reports. (Unpublished)

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Abstract

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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div E > Manufacturing Systems
Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 13 Sep 2017 20:05
Last Modified: 19 Sep 2017 01:33
DOI: