▎ 摘　　要

In this work, the influence of Graphene oxide (GO) on the sensing performance of Polyaniline (PANI) toward NH3 and CO gases at room temperature (RT) was comprehensively studied. The PANI/GO nanocomposite was synthesized by the "in-situ chemical oxidation polymerization" route in the presence of GO. The optical, spectroscopic and structural properties of as-prepared materials were studied through UV-vis, FTIR, RAMAN spectroscopies and XRD. Additionally, the topological investigations of materials were carried out by Atomic Force Microscopy (AFM). The sensors were fabricated via drop-casting of the pure PANI and PANI/GO nanocomposite on a low-cost pattern of Cu interdigitated electrodes (IDE). The sensors based on the PANI/GO nanocomposite exhibited a better-sensing performance for NH3 than those of bare PANI. The present finding indicates that the PANI/GO-based sensor exhibits high response (9.6%-70 ppm), fast recovery time (23 s), low detection limit (30 ppm) and linear dynamic range (30-230 ppm) with excellent repeatability, reproducibility, long-term stability and exceptional selectivity for NH3 sensing. Thus, the PANI/GO-based sensor has a high potential for high-performance sensing applications. (C) 2022 Vietnam National University, Hanoi. Published by Elsevier B.V.