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(a–d) TEM images of nitrogen-doped MWNT (n-MWNT) samples during enzymatic degradation: (a) As synthesized and purified n-MWNT at Day 0. The inset shows the schematic illustration of its stacked-cup structure. (b) Day 15, (c) Day 50, and (d) Day 80. (e) Photographs comparing n-MWNT samples before (left) and after (right) enzymatic degradation. (f) Raman spectra for n-MWNT samples before (black) and after (red) enzymatic degradation.
