(Color online) (a) SEM image of the as-prepared SWNT ropes, showing that a SWNT rope is made up of many parallel thinner fibers. [(b)–(d)] SWNT filament bulbs emitting incandescent light, whose light color shifts from orange to white.
(a) Comparison of the experimentally obtained emission spectra of a SWNT filament induced by an electrical current under different input power conditions with the curves of blackbody radiation. The light intensity of the actual spectra and fitted spectra is multiplied by the scale factor. (b) Plot of transmission factor vs wavelength. (c) Plot of the fitted temperature vs input power .
(a) Raman spectra of the SWNT filament before (curve a) and after light emission (curves b and c). [(b) and (c)] SEM images of the SWNT filament after the structural transformation during light emission showing that a high density of spherical amorphous carbon particles were formed. (d) TEM images of the SWNT filament after the structural transformation during light emission. The inset shows a double-walled carbon nanotube (DWNT) with an outer diameter of 5.6 nm.
SEM images of the SWNT filament after the incomplete structural transformation during light emission, showing a mushroomlike structure consisting of the remaining SWNT bundles and newly formed spherical amorphous carbon particles.
Change of two-point normalized electrical resistance of the SWNT filament with input power. is the resistance of the SWNT filament at room temperature.
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