▎ 摘　　要

Detection of the herbicide paraquat (PQ) is of great significance in the field of agriculture. To detect PQ, this work proposed the fabrication of a new electrochemical sensor based on graphene oxide/ZnO nanorod (GR/ZnO)-modified graphite screen-printed electrodes (SPEs). SPEs were used since they are small, low-cost and versatile. The GR/ZnO-modified SPE was prepared by casting a nanocomposite of the GR/ZnO nanorods on the SPE surface. The two reduction DPV peaks of PQ were remarkably strengthened with GR/ZnO at -0.60 V and -1.00 V. The reduction peak currents of PQ on the GR/ZnO-modified SPE were linear under the optimal conditions (concentration range: 0.05-2 mu M), and the limit of detection (LOD) was 21 nM.