Table 1.

HOMO, LUMO and band gap of C-dots and analytes.

sample	HOMO (eV)	LUMO (eV)	band gap (eV)
C-dots	−4.51	−1.48	3.03
cocaine	−5.93	−1.80	4.13
4-chloroethcathinone	−6.01	−1.95	4.06
ephedrine	−5.07	−0.61	4.46