My titanium oxide nanotube blocked and did not distinguish in SEM images from their up side.
You can try to use FIB to cut off the blocked end and see if the rest of the nanotube is hollow...
thanks to your answer if you have any paper about it may inform me because my work is very sensitive to pollution so I should know exact process
"Strong, Light, Multifunctional Fibers of Carbon Nanotubes with Ultrahigh Conductivity" Science 11 January 2013: vol. 339 no. 6116 182-186 - See Fig. 3(E)
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