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SEM and EDS images of Ba-MWCNT yarn after heat treatment at for in vacuum. [(a) and (b)] SEM images of the yarn at different magnifications. (c) EDS image of the yarn.
Activation process for Ba-MWCNT yarn at and . Inset: Schematic diagram of the electric circuit used for thermionic emission tests.
(a) curves for Ba-MWCNT yarn at different temperatures. (b) Experimental data (solid squares) and fitted line for a plot of vs for Ba-MWCNT yarn.
Stress-strain tests for MWCNT yarns after barium functionalization and further heat treatment. Inset: Corresponding Raman spectra.
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