Abstract
Different biological methods are gaining recognition for the production of silver nanoparticles (Ag-NPs) due to their multiple applications. The use of plants in the green synthesis of nanoparticles emerges as a cost effective and eco-friendly approach. In this study the green biosynthesis of silver nanoparticles using Callicarpa maingayi stem bark extract has been reported. Characterizations of nanoparticles were done using different methods, which include; ultraviolet-visible spectroscopy (UV-Vis), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDXF) spectrometry, zeta potential measurements and Fourier transform infrared (FT-IR) spectroscopy. UV-visible spectrum of the aqueous medium containing silver nanoparticles showed absorption peak at around 456 nm. The TEM study showed that mean diameter and standard deviation for the formation of silver nanoparticles were 12.40 ± 3.27 nm. The XRD study showed that the particles are crystalline in nature, with a face centered cubic (fcc) structure. The most needed outcome of this work will be the development of value added products from Callicarpa maingayi for biomedical and nanotechnology based industries.
Highlights
Nanoparticles are normally considered as particles with a maximum size of 100 nm
Reduction of Ag+ into Ag-NPs during exposure to Callicarpa maingayi stem bark extracts could be followed by the colour change
The result obtained in this investigation is interesting because it can serve as a foundation in terms of identification of potential forest plants for synthesizing Ag-NPs
Summary
Nanoparticles are normally considered as particles with a maximum size of 100 nm. They display completely novel or improved properties, which are quite different from those of larger particles. In the compared to the larger particles of the bulk material that they are composed of based on specific characteristics such as size, shape, distribution, and surface morphology [1] Metal nanoparticles, such as Ag, Au, Pt and Pd, are extensively applied in products that directly come in contact with the human body, such as household items like detergents, soaps, shampoos, cosmetic products, and toothpaste, and they find applications in the pharmaceutical and medical area [2]. This may perhaps have numerous applications in the fields of dentistry, clothing, catalysis, mirrors, optics, photography, electronics and food industries [3]. Because of such broad variety of applications, wide ranges of different preparation methods have been developed. Nanosilver with small particle size and devoid of aggregation between particles is favorable in this purpose
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