The present study involves an ecofriendly strategy for the reduction of bulk silver into its nanoforms by using the aqueous extracts of Mentha longifolia leaves (MLL), M. longifolia branches (MLB), and Mentha arvensis (MA). Synthesis of silver nanoparticles (AgNPs) was confirmed initially by observing a change in the color of the reaction mixture followed by measuring the absorbance, and a characteristic surface plasmon resonance band was observed between 400 and 500 nm of the λ of light. Morphological and optical characterization techniques of AgNPs were performed by using UV–visible spectrophotometer, scanning electron microscopy, atomic force microscopy, energy‐dispersive X‐ray spectroscopy (EDX), and dynamic light scattering (DLS) analysis. It was confirmed that the phytosynthesized nanoparticles are anisotropic and nearly spherical having a size smaller than 100 nm while some cubical and prismatic nanostructures were also observed. The average size of a single nanoparticle measured by DLS analysis was reported 10.50 nm, 15.55 nm, and 20.46 nm biofabricated by using MLB, MLL, and MA extract, respectively. The EDX analysis reported the presence of elemental Ag while elemental O was also observed in MLL and MLB AgNPs. The results from these experiments endorse the potential of reported plant species to phytosynthesize AgNPs. The future applications of this work involve the utilization of AgNPs for multiple biological applications.

中文翻译：

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Mentha longifolia 和 Mentha arvensis 胶体纳米银的植物合成：比较形态学和光学表征。

本研究中使用的水提取物涉及用于还原体银的成其纳米形式生态友好的战略欧薄荷叶（MLL），M.长叶分支（MLB），和薄荷（MA）。银纳米粒子 (AgNPs) 的合成最初是通过观察反应混合物颜色的变化来确认的，然后测量吸光度，并且在λ 的400 和 500 nm 之间观察到特征表面等离子体共振带的光。通过使用紫外可见分光光度计、扫描电子显微镜、原子力显微镜、能量色散 X 射线光谱 (EDX) 和动态光散射 (DLS) 分析对 AgNPs 进行形态学和光学表征技术。经证实，植物合成的纳米颗粒是各向异性的，几乎是球形的，尺寸小于 100 nm，同时还观察到一些立方体和棱柱形纳米结构。通过 DLS 分析测量的单个纳米颗粒的平均尺寸分​​别为 10.50 nm、15.55 nm 和 20.46 nm，分别使用 MLB、MLL 和 MA 提取物生物制造。EDX 分析报告了元素 Ag 的存在，而在 MLL 和 MLB AgNPs 中也观察到元素 O。这些实验的结果证实了报道的植物物种在植物合成 AgNPs 方面的潜力。这项工作的未来应用涉及将 AgNPs 用于多种生物应用。