Platelet-structured strontium titanate perovskite decorated on graphene oxide as a nanocatalyst for electrochemical determination of neurotransmitter dopamine

Abstract

In this work, we synthesized strontium titanate (SrTiO₃) by a simple co-precipitation technique and decorated it with graphene oxide (SrTiO₃/GO) for the effective determination of neurotransmitter agent dopamine (DA). The as-synthesized SrTiO₃–GO nanocomposite was orderly characterized by various microscopic and spectroscopic techniques, which revealed that the formed nanocomposite was pure with a desired morphology. A SrTiO₃–GO-modified glassy carbon electrode generates high current with low peak potential compared with a bare GCE with the linear range response from 0.05 to 531 μM, and the lower detection limit is 0.01 μM with higher sensitivity. However, the modified electrode exhibited good repeatability, reproducibility, stability, and selectivity during the interference study using different metal ions and biomolecules. Finally, real sample analysis was carried out in human urine and blood serum samples to identify the practical possibilities of the synthesized composite and satisfactory recovery results were obtained.