▎ 摘　　要

NOVELTY - A screen printing electrode is a reduced graphene oxide screen-printed electrode having a cyclodextrin polymer surface modified. USE - Screen printing electrode is used for synchronous detection of ascorbic acid, dopamine and uric acid molecules (claimed), and as electrochemical sensor in electrocatalysis applications. ADVANTAGE - The screen printing electrode has high molecular recognition ability and excellent conductivity, and improves the electrochemical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for method for preparing a screen printing electrode, which involves preparing reduced graphene oxide using hydriodic acid by reduction method, adding 0.8-1 mg reduced graphene oxide to 0.8-1 mL ethanol, carrying out ultrasonic treatment of mixture for 20 to 30 minutes to obtain a uniformly distributed reduced graphene oxide suspension, dipping 8-10 mu L reduced graphene oxide suspension in screen-printed electrode, drying electrode in air to obtain reduced-oxygen oxide graphene screen-printed electrode, using phosphate buffered salt solution containing a cyclodextrin polymer as an electrolyte solution and reduced graphene oxide screen-printed electrode as a working electrode, carrying out electropolymerization of cyclodextrin polymer with the surface of the reduced graphene oxide screen-printed electrode by cyclic voltammetry, allowing to stand still at room temperature, drying to obtain product and storing finished product.