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Journal Articles Nanotechnology Year : 2022

Effect of extreme mechanical densification on the electrical properties of carbon nanotube micro-yarns

Abstract

Abstract We have explored the effect of high pressure post-treatment in optimizing the properties of carbon nanotube yarns and found that the application of dry hydrostatic pressure reduces porosity and enhances electrical properties. The CNT yarns were prepared by the dry-spinning method directly from CNT arrays made by the hot filament chemical vapour deposition (HF-CVD) process. Mechanical hydrostatic pressure up to 360 MPa induces a decrease in yarn resistivity between 3% and 35%, associated with the sample’s permanent densification, with CNT yarn diameter reduction of 10%–25%. However, when increasing the pressure in the 1–3 GPa domain in non-hydrostatic conditions, the recovered samples show lower electrical conductivity. This might be due to concomitant macroscopic effects such as increased twists and damage to the yarn shown by SEM imaging (caused by strong shear stresses and friction) or by the collapse of the CNTs indicated by in situ high pressure Raman spectroscopy data.
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Dates and versions

hal-03654908 , version 1 (29-04-2022)

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Cassandre Miralaei, Sylvie Le Floch, Regis Debord, Hung Nguyen, Julio da Silva, et al.. Effect of extreme mechanical densification on the electrical properties of carbon nanotube micro-yarns. Nanotechnology, 2022, 33 (27), pp.275708. ⟨10.1088/1361-6528/ac6039⟩. ⟨hal-03654908⟩
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