A novel ZnO/reduced graphene oxide and Prussian blue modified carbon paste electrode for the sensitive determination of Rutin

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（2）
• 页码范围: 262-270
• 页数: 9页
• 语种: 英文

摘要

A carbon paste modified sensor based on a novel composite of zinc oxide nanoparticles deposited on reduced graphene oxide (ZnO-rGrO) and Prussian blue (PB) was drop-cast (ZnO-rGrO-PB/MCPE) for the sensitive estimation of Rutin (Rtn) at pH 7.0.The high surface area of ZnO-rGrO and electrocatalytic property of PB promotes the oxidation of Rtn.Field emission scanning electron microscope (FE-SEM) and energy-dispersive X-ray spectroscopy (EDX) techniques were employed to confirm the deposition of ZnO-rGrO and PB on carbon paste electrode (CPE).The ability of ZnO-rGrO-PB/MCPE in charge transfer at the interface was investigated using electrochemical impedance spectroscopy (EIS).The heterogeneous rate constant (ks) and the charge transfer coefficient (a) have been calculated as 6.08 s-1 and 0.74 respectively.This sensor showed a wide linear response for Rtn from 7.0× 10-8 to 7.0× 10-6M and 7.0× 10-6 to 1.0× 10-4M with a limit of detection (2.05±0.04)× 10-8M (S/N=3).The application of ZnO-rGrO-PB/MCPE was found in the analysis of Rtn in fruit juice samples using standard addition method.This sensor showed good reproducibility,stability,selectivity and sensitivity.