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In this study, a nanocomposite sensor film was developed to identify arsenic metal ions (As3+) in a solution. Polyvinyl alcohol (PVA) nanocomposite films containing in-situ produced gold nanoparticles (AuNPs) were studied for optical, structural, and electrical conductivity, as well as As3+ ion sensing. UV-visible (UV-Vis) spectroscopy was used to corroborate the genesis of AuNPs and showed a band in the wavelength range λ = 526–535 nm. Fourier transform infrared (FT-IR) spectroscopy revealed structural changes in PVA due to AuNP incorporation. The X-ray diffraction (XRD) analysis confirmed the face centered cubic (FCC) structure of the developed AuNPs. Morphological features studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed a spherical form of AuNPs with an average size of 7.9 nm. The samples exhibited improved electrical conductivity and thermal stability at higher AuNP concentrations. The produced films were evaluated for sensing As3+ ions using UV-Vis spectroscopy under aqueous conditions. The system exhibited a linear response to As3+ ion concentrations ranging from 1 ppb to 200 ppb. A real water analysis was also performed to ensure the reliability of the developed nanocomposite strips. The detection of As3+ in spiked tap water yielded favorable results, with a detection limit (LOD) 6.38 parts per billion (ppb). These findings demonstrate that this research could be a practical and highly useful tool for detecting As3+ ions under aqueous conditions.
Krishna et al. (Wed,) studied this question.