Electrochemical sensing of nitenpyram based on the binary nanohybrid of hydroxylated multiwall carbon nanotubes/single-wall carbon nanohorns

Monitoring nitenpyram (NIT) is essential, because it is a chemically toxic and widely used nicotinamide pesticide in agriculture. In this paper, novel electrochemical sensorswere constructed using the binary nanohybrid of hydroxylated multiwall carbon nanotubes/single-wall carbon nanohorns (HCNT/CNH) to monitor NIT. The morphologies and specific surface areas of HCNT, CNH, and HCNT/CNH were analyzed. The specific morphologies of binary nanohybrid endowed the constructed electrochemical sensor with many active sites for the target analyte, which improved the sensitivity of NIT determination. The constructed sensor's NIT determinationwas investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The peak current of NIT on HCNT/CNH/GCE was linearly correlated with NIT concentration in the range of 20-2000 nM. The limit of detection of NIT was 4.0 nM. The proposed sensor in this study was successfully applied to a corn sample to monitor NIT.