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.