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Sustained laser induced incandescence in carbon nanotubes for rapid localized heating
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the experiment setup to achieve sustained LII of CNTs. Inset (a) shows a snapshot of the LII as seen through the optical microscope. Inset (b) shows the raw intensity profile of the LII captured by the optical spectrometer.

Image of FIG. 2.
FIG. 2.

(a) Intensity vs wavelength profile of the LII taken at an instant after laser irradiation for various laser powers. Solid lines are the corresponding fittings of the data with the Planck blackbody radiation equation. (b) Intensity vs time evolution of LII at various laser powers. Laser was irradiated on the sample at . Inset in (b) shows the temperature-time evolution of the CNTs undergoing LII with the laser power of 24 mW. Air pressure is kept at . [(c) and (d)] Intensity profiles at various vacuum levels. Inset in (d) shows a long duration spectrum of a sustained LII that was allowed to last for more than 2 h. A laser power of 24 mW was used.

Image of FIG. 3.
FIG. 3.

[(a) and (b)] SEM images of CNTs before and after LII reveal thickened structure of post-LII CNTs. (c) Cross-sectional SEM shows that only the thickened structures are restricted to the top sections of the post-LII CNTs. [(d) and (e)] TEM images of CNTs before and after LII show coatings of possibly amorphous carbon on individual post-LII CNTs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sustained laser induced incandescence in carbon nanotubes for rapid localized heating