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Cyclic voltammograms of (a) 0.66 mg ml−1 of C-dots, (b) 10 mM of 4-chloroethcathinone, (c) 10 mM of cocaine and (d) 1 mM of ephedrine in ACN. Cyclic voltammetry was conducted in a positive mode with a sweeping rate of 0.1 V s−1 at ambient condition.
