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The electrochemical behaviors of GCE, GO-CS/GCE, AuNPs/GCE and GO-CS-AuNPs/GCE in the presence of 10 mM NO2−. (a) Cyclic voltammograms at GCE, GO-CS/GCE and GO-CS-AuNPs/GCE in the presence of 10 mM NO2− in the 0.1 M pH 5.0 phosphate buffer solution (PBS) (scan rate: 100 mV/s). (b) The ratio of the peak current (Ii) of the other electrodes to the peak current (I0) of GO-CS-AuNPs/GCE in (a).
