Evaluation of nicotine sensor based on copper nanoparticles and carbon nanotubes
Journal of nanostructure in chemistry(2015)
摘要
An electrochemical sensor was prepared to detect nicotine by depositing copper nanoparticles (Cu NPs) on the surface of a glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWNTs). The modified electrode was characterized by scanning electron microscopy 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 × 10 −6 to 9 × 10 −5 M and 0.164 ( r 2 = 0.982) from 1 × 10 −4 M up to 1 × 10 −3 M. The detection limit was 1 µM. For six parallel detections of 1 mM nicotine, the relative standard deviation was 5.68 %, suggesting that the film-modified electrode had good reproducibility. Experimental parameters affecting the sensor response such as pH, modifier concentration and electro-deposition scan rate were found to be optimum at 7.0, 2 mg mL −1 and 80 mV s −1 , respectively.
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关键词
Copper nanoparticles, Cyclic voltammetry, Multi-walled carbon nanotube, Nano-biosensor, Nicotine
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