▎ 摘　　要

A surface plasmon resonance method based on a prismatic configuration can be considered as a versatile accurate technique, which can be utilized in detecting chemical toxins. In this study, layers of polypyrrole-graphene dots nanocomposite were produced at different deposition times using the electrodeposition method. Characterization methods such as the field emission-scanning microscopy, X-ray diffraction spectroscopy, and the Fourier transform infrared spectroscopy were employed to obtain and verify the morphology and chemical elements present in the composite layer. The thickness and refractive index of polypyrrole-graphene quantum dots layer ranged between 3.2 nm and 65.2 nm and 1.6895+i 0.112 to 1.6076+i 0.163, respectively. The layer was utilized to measure the low concentration of arsenic (As+3) ions in the range of 0.005-10 ppm and the results have been compared with the response of sensor in the presence of mercury (Hg+2) and lead (Pb+2) ions. However, it must be noted that the sensor's limit was 0.005 ppm, and the sensitivity of arsenic detection was larger than that of mercury and lead ions.