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(a) TEM image of NCB and its higher magnification (inset). (b) High-resolution TEM image of the NCB and its SAED pattern (inset). (c) XPS spectrum showing the O 1s and C 1s peaks of the NCB. The inset in the panel shows the deconvolution of the C 1s XPS peak. (d) Raman spectrum of NCB.
