| Summary: | The present study aimed to explore the eco-friendly synthesis of prism-like silver oxide nanoparticles (Ag<sub>2</sub>ONPs) from nappa cabbage extract and its <i>p</i>-nitrophenol sensing activity. The prepared Ag<sub>2</sub>ONPs were characterized by X-ray diffraction (XRD), field-emission scanning spectroscopy (FESEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and ultraviolet (UV)–visible light spectral analysis (UV–Vis). <i>p</i>-Nitrophenol sensing properties of the prepared nanoparticles were also determined using a simple I–V method. The results showed that the as-prepared Ag<sub>2</sub>ONPs have a face-centered cubic (fcc) crystalline nature and a prism-like morphology with particle size in the range 21.61–92.26 nm. The result also showed a high intensity of the (111) facet, making the Ag<sub>2</sub>ONP–carbon black/nickel foam electrode (Ag<sub>2</sub>ONP–C/NFE) exhibit a high-performance response to <i>p</i>-nitrophenol spanning a wide range of concentrations from 1.0 mM to 0.1 pM and a response time of around 5 s, indicating a high potential for water treatment applications.
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