▎ 摘　　要

Failure to control the levels of emerging pollutants in water supply can affect the quality of human life, and this maybe mitigated with a low-cost, real-time monitoring system. Herein, we describe a paper-based fully printed electrochemical sensor with reduced graphene nanoribbons (rGNR) capable of detecting sulfamethoxazole (SMX) and trimethoprim (TMP) antibiotics simultaneously in real water samples. The electrodes were printed on parchment paper, which is environmentally friendly and has an efficient printing capacity. Deposition of rGNRs in the matrix was confirmed with Raman spectroscopy, transmission electron microscopy (TEM), and X-ray photoemission spectroscopy (XPS). Optimized sensing performance was obtained using an electrochemical treatment of the electrodes at neutral pH. The paper-based sensor displayed a linear response from 1 mu mol l-1 to 10 mu mol l-1 for both antibiotics, with detection limits of 0.09 mu mol l-1 and 0.04 mu mol l-1 for SMX and TMP, respectively. The sensor was reproducible, with an RSD below 5%,and selective for the antibiotics including in real samples, in a demonstration of its potential for realtime monitoring of water supply systems.