Sonoelectrochemical synthesized RGO-PbTe composite for novel electrochemical biosensor

Reduced graphene oxide-lead tellurium (RGO-PbTe) composites were fabricated via sonoelectrochemical technique. The crystalline structure, composition and morphology of the products were characterized by X-ray powder diffraction (XRD), energy dispersive X-ray spectrometer (EDS), transmission electron microscopy (TEM), respectively. The results showed that the PbTe nanoparticles (NPs) were uniformly decorated on the RGO sheets. The formation mechanism of RGO-PbTe nanocomposite was proposed. Ultrasonic played an important role in the formation of PbTe NPs. The composites were further used as supports for immobilization of hemoglobin (Hb) to fabricate a novel electrochemical biosensor, which had good thermal stability, conductivity and biocompatibility and enhanced direct electron transfer. This biosensor showed excellent electrocatalytic activity towards H2O2 with a linear range from 0.5 to 30 μM and low detection limit as 0.13 μM.