Abstract
An electrochemical sensor was prepared to de- tect nicotine by depositing copper nanoparticles (Cu NPs) on the surface of a glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWNTs). The mod- ified electrode was characterized by scanning electron mi- croscopy and cyclic voltammetry. The novel-modified sensor exhibited effective electrocatalytic activities toward anodic oxidation of nicotine. Calibration plot showed two linear regions with different sensitivity, 1.121 (r 2 = 0.982) in the range from 1 9 10 -6 to 9 9 10 -5 M and 0.164 (r 2 = 0.982) from 1 9 10 -4 Mu p to 19 10 -3 M. The detection limit was 1 lM. For six parallel detections of 1 mM nicotine, the relative standard deviation was 5.68 %, suggesting that the film-modified electrode had good re- producibility. Experimental parameters affecting the sensor response such as pH, modifier concentration and electro- deposition scan rate were found to be optimum at 7.0, 2m g mL -1 and 80 mV s -1 , respectively.
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