▎ 摘　　要

The pH-sensitive polymers have been widely applied to solid-state pH sensors due to the characteristics of low cost, facile fabrication and biocompatibility. The composite material of polymer-nanomaterial can effectively improve the sensitivity and stability of the polymer solid-state pH sensors. In this work, a solid-state potentiometric pH sensor based on pH-sensitive polymer was fabricated using electropolymerization of p-aminophenol on reduced graphene oxide (PpAP-rGO/GRE). rGO modified electrode could provide a larger electrochemical active area and more abundant attachment sites, which improved the sensitivity and stability of the sensor. Scanning electronic microscope, X-ray photoelectron spectroscopy and electrochemical methods were conducted to characterize the sensor. The sensor exhibited a Nernstian response of 54.5 mV/pH over a wide pH range from 0.99 to 10.01, with good repeatability (RSD = 0.37%), reproducibility (RSD<3.67%), fast response time (<30 s) and durability (0.3 mV/h). Ideal performances, including fast response, high sensitivity, accuracy and stability, excellent anti-interference ability to ions and applicability to different buffer solutions and real samples, were obtained in this work. The novel sensor provided a new technical route to further developing solid-state pH sensor.