Development of an Electrochemical Biosensor Based on Carbon Nanotubes and Benzocrown for the Detection of Cd+2 ions

Cadmium (Cd²⁺) is an extremely potent heavy metal found in phosphate fertilizers, and its presence poses a significant risk to the safety of food. This is a pressing concern as it can cause severe health issues. Therefore, it is crucial to create effective analytical techniques to track these hazardous materials. To address this, a new biosensor has been developed with polyaniline, carbon nanotubes, and benzocrown immobilized on a glassy carbon electrode's surface via electropolymerization. Electrochemical cyclic voltammetry indicates that polyaniline electrodepositing, and nanocomposites have improved surface conductivity of GCE. A simple electrochemical biosensor for cadmium detection has been successfully fabricated with biopolymer nanocomposites PANI/SWCNT/BEZOCROWN on GCEs. The biosensor demonstrated a wide linear range (10-14mol/L_10-10mol/L), and a limit of detection of 0.45 × 10^10 M (S/N=3).