▎ 摘　　要

To develop the isoprenaline (ISN) sensor with a simple and convenient synthesis process, the novel gadolinia doped zinc oxide is decorated on graphene oxide (GZO@GO) nanocomposite. The GZO@GO was synthesized through a cost-effective coprecipitation approach. XRD, FT-IR, and XPS, FE-SEM, and HR-TEM studies were used to investigate the physicochemical properties of as-prepared nanomaterials. The synthesized GZO@GO composite was successfully modified with a glassy carbon electrode (GCE) and employed as a superior electrocatalyst and challenging sensing platform for ISN detection. Electron transferability of these supported catalysts is probed by electrochemical techniques i.e. CV and EIS using K-3[Fe(CN)(6)]/K-4[Fe(CN)(6)] as a redox probe. The electrochemical oxidation of ISN based on GZO@GO was monitored by CV and DPV by optimal conditions. The present sensor showed a dynamic linearity is 0.02 mu M-122.1 mu M; regression equation; I-pa(mu M) = 8.1847 (c/mu M)-0.4502 (R-2 = 0.995) with the detection limit is achieved 0.003 mu M. Also, the modified electrode demonstrates good long-term reliability, reproducibility, and good anti-interference ability. The GZO@GO modified electrode displayed higher electrocatalytic activity towards ISN oxidation due to the increasing adsorption of ISN on GZO@GO modified electrode surfaces. Finally, our proposed material was applied for the ISN determination in a human urine sample with satisfactory recovery results. This work provides insights into the eco-friendly synthesis of nanocatalyst (GZO@GO) for the ISN sensor.