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The CV curves of bare GCE (dashed black line), GO/GCE (blue line), and F-GO/GCE (red line) recorded in the absence of caffeic acid (CA) (A); the F-GO/GCE response in the presence of 50.0 μM CA (B); a comparison of the modified GCEs in the presence of 50.0 μM CA (C) in a 0.1 M B-R buffer solution (pH 2.65) at a scan rate of 50 mV s−1.
