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Memon, Ayaz Ali
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article
Application of synthesized copper nanoparticles using aqueous extract ofZiziphus mauritiana L. leaves as a colorimetric sensor for the detection of Ag.
Abstract
The presented work demonstrates the preparation of copper nanoparticles (CuNPs) via aqueous leaves extract of <i>Ziziphus mauritiana</i> L. ( <i>Zm</i> ) using hydrazine as a reducing agent. Various parameters such as volume of extract, concentration of hydrazine hydrate, concentration of copper chloride, and pH of the solution were optimized to obtain <i>Ziziphus mauritiana</i> L. leaves extract derived copper nanoparticles ( <i>Zm</i> -CuNPs). Brownish red color was initial indication of the formation of <i>Zm</i> -CuNPs while it was confirmed by surface plasmon resonance (SPR) band at wavelength of 584 nm using ultraviolet-visible (UV-vis) spectroscopy. Synthesized <i>Zm</i> -CuNPs were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffractometry (XRD). AFM images showed that the particle size of <i>Zm</i> -CuNPs was from 7 to 17 nm with an average size of 11.3 nm. Fabricated sensor ( <i>Zm</i> -CuNPs) were used as a colorimetric sensor for the detection of Ag <sup>+</sup> at a linear range between 0.67 × 10 <sup>-6</sup> - 9.3 × 10 <sup>-6</sup> with R <sup>2</sup> value of 0.992. For real water samples, limit of quantification (LOQ) and limit of detection (LOD) for Ag <sup>+</sup> was found to be 330 × 10 <sup>-9</sup> and 100 × 10 <sup>-9</sup> , respectively.