▎ 摘　　要

A reduced graphene oxide@zeolitic imidazolate framework-8 (rGO@ZIF-8) based electrochemical sensor was developed and used for dopamine detection. ZIF-8 was rapidly prepared by zinc hydroxide nitrate (Zn-HDS, Zn-5(OH)(8)(NO3)(2)center dot 2H(2)O) as precursor. Subsequently, rGO was introduced to enhance the performance of ZIF-8 (e.g., high carrier mobility, favorable stability), and a label-free electrochemical dopamine sensor based on the composite material was obtained with high specific surface area and better conductivity verified by Brunauer-Emmett-Teller surface analysis and electrochemical impedance spectroscopy, respectively. Consequently, rGO@ZIF-8 complex exhibited an admirable electrochemical catalytic performance. For determination of dopamine, the sensor behaves wide linear range from 2.0 x 10(-6) to 1.4 x 10(-4) mol l(-1) and lower detection limit of 2.0 x 10(-8 )mol l(-1) (S/N = 3). It also showed sufficient repeatability and durability due to the coordinated amplification effect of rGO and ZIF-8.