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SEM images of (a) UBWO and (b) 3wt%N-CQDs/UBWO. (c) TEM and (d) HR-TEM images of 3wt%N-CQDs/UBWO. (e) TEM image of N-CQDs prepared from discarded corn stover (inset is the HRTEM image of an individual N-CQDs). (f) Particle size distribution diagram of N-CQDs.
