I have done XRD of prsitine, heated and functionalized nanotubes and found that functionalized nanotubes have reduced crystal size compared to pristine owing to the acid treatment but why the crystal size of annealed nanotubes increase prior to its functionalization
(Asked by Deepika Jamwal, PhD Scholar, University of Jammu).
It can be adsorbents on the outside. The adsorption center strongly depends on the type of adsorbent. If the adsorption center is the nanotube atom, this will lead to protrusion from its contour. The size of the crystal will decrease. Annealing will lead to desorption of that adsorbents and increase the crystal size.
temperature range is 350 degree and swcnts were heated at rate of 3 degree/ min for 3 hours @Mohamed Elsayed harb sir.
Dear Veenu Shankar
Have a nice day
The crystal size of the single walled carbon nanotubes increased after heating may be attributed to the increase of their crystallization process and the coalescence of the small crystallite and hence the grain boundaries increased.
Good luck
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