Electrochemical behaviour of carbon paste electrodes enriched with tin oxide nanoparticles using voltammetry and electrochemical impedance spectroscopy

The effect of the SnO2 nanoparticles (SNPs) on the behaviour of voltammetric carbon paste electrodes were studied for possible use of this material in biosensor development. The electrochemical behaviour of SNP modified carbon paste electrodes (CPE) was first investigated by using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) techniques. The performance of the SNP modified electrodes were compared to those of unmodified ones and the parameters affecting the response of the modified electrode were optimized. The SNP modified electrodes were then tested for the electrochemical sensing of DNA purine base adenine to explore their further development in biosensor applications.

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► 3–4 nm size of SnO2 nanoparticles (SNPs) were used herein for development of electrochemical biosensor.
► The electrochemical behaviour of SNP modified CPE was investigated compared to bare CPE using voltammetry and electrochemical impedance spectroscopy techniques.
► SNP modified electrodes were used as the first time in our study for improved monitoring of DNA base, adenine.