Development of selective colorimetric detectors that can use green-fabricated silver nanoparticles' (AgNPs) with localized surface plasmon resonances (LSPRs) to rapidly, simply, and selectively detect Hg(II) ions was undertaken in this study. Onion extract was used for synthesising photo-induced green crystalline silver nanoparticles (NPs). The formation of nanoparticles is enhanced when ultrasound irradiation is present; bioligands could serve as stabilizing and reducing agents. Different methods of measurement, including UV-Vis, TEM, SEM/EDAX, FT − IR, and XRD, are effective for characterization of nanoparticles. The spherical nature of green-fabricated AgNPs is confirmed by TEM. High-density, spherical, and uniformly formed silver nanoparticle shapes were found in silver nanoparticle SEM images. The arrangement of AgNPs in the form of face-centered cubic structures was confirmed by XRD patterns. The formation of impurity-free AgNPs was confirmed using the EDAX analysis results. Hg2+ with excellent sensitivity was sensitively and selectively detected by employing green-synthesized silver nanoparticles. The reduction of Ag (1) to Ag (0) was confirmed by a slight increase in Hg (II) concentration and progressive reduction of green-synthesized AgNPs, whose absorbance changed abruptly. The reduction of LSPRs by the phosphate buffer medium enables AgNPs to sensitively and selectively detect Hg2+ ions by providing good environment. Besides, a selective, sensitive, simple, and rapid method that is proposed for detecting Hg (II) ions in samples of water is presented in the study. Harmful mercury ions in real samples of water (tap and ground water) can colorimetrically and selectively be detected using the AgNPs. The results showed an RSD of below 6% and over 92% of good recovery.

中文翻译：

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基于局部表面等离子体共振光学特性的比色检测，用于使用绿色合成的银纳米粒子感测汞。

本研究进行了选择性比色检测器的开发，该检测器可以使用具有局部表面等离子体共振（LSPR）的绿色制造的银纳米颗粒（AgNP）来快速，简单和选择性地检测Hg（II）离子。洋葱提取物用于合成光诱导的绿色结晶银纳米颗粒（NPs）。当存在超声辐射时，纳米颗粒的形成得以增强；生物配体可以用作稳定剂和还原剂。不同的测量方法（包括UV-Vis，TEM，SEM / EDAX，FT-IR和XRD）可有效表征纳米颗粒。TEM证实了绿色制造的AgNP的球形性质。在银纳米粒子SEM图像中发现了高密度，球形和均匀形成的银纳米粒子形状。X射线衍射图证实了AgNP以面心立方结构的形式排列。使用EDAX分析结果确认了无杂质AgNP的形成。通过使用绿色合成的银纳米粒子，可以灵敏地和选择性地检测出Hg2 +，其灵敏度极高。汞（II）浓度的略微增加和绿色合成的AgNPs的逐渐减少证实了Ag（1）还原为Ag（0），其吸收率突然改变。磷酸盐缓冲液对LSPR的还原作用使AgNP通过提供良好的环境能够灵敏地和选择性地检测Hg2 +离子。此外，本研究还提出了一种选择性，灵敏，简单，快速的检测水样中汞（II）离子的方法。实际的水（自来水和地下水）样品中的有害汞离子可以使用AgNPs进行比色和选择性检测。结果表明，RSD低于6％，回收率超过92％。