Abstract
Biogenic synthesis of silver nanoparticles (AgNP) was performed at room temperature using Aloe vera plant extract in the presence of ammoniacal silver nitrate as a metal salt precursor. The formation of AgNP was monitored by UV-visible spectroscopy at different time intervals. The shape and size of the synthesized particle were visualized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. These results were confirmed by X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses and further supported by surface-enhanced Raman spectroscopy/Raman scattering (SERS) study. UV-visible spectrum has shown a sharp peak at 420 nm and further evidenced by FTIR peak profile (at 1587.6, 1386.4, and 1076 cm−1 with corresponding compounds). The main band position with SERS was noticed at 1594 cm−1 (C–C stretching vibration). When samples were heated under microwave radiation, AgNP with octahedron shapes with 5–50 nm were found and this method can be one of the easier ways to synthesis anisotropic AgNP, in which the plant extract plays a vital role to regulate the size and shape of the nanoparticles. Enhanced antibacterial effects (two- to fourfold) were observed in the case of Aloe vera plant protected AgNP than the routinely synthesized antibiotic drugs.Graphical Shape and size-controlled synthesis of silver nanoparticles using Aloe vera plant extract Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1725-x) contains supplementary material, which is available to authorized users.
Highlights
Nanoparticle-mediated studies have been predominantly demonstrated and penetrated into the interdisciplinary sciences with nanotechnology due to their potential applications [1,2,3,4,5,6,7,8,9]
We report size and shape-controlled synthesis of Silver nanoparticles (AgNP) using Aloe vera plant extract wherein the Aloe vera gel plays a vital role as a shape-directing agent for the growth of AgNP under microwave irradiation
An additional strength has been given for the preparation using Aloe vera gel, as it is one of the important sources for the synthesis of spherical as well as octahedron-shaped AgNP
Summary
Nanoparticle-mediated studies have been predominantly demonstrated and penetrated into the interdisciplinary sciences with nanotechnology due to their potential applications [1,2,3,4,5,6,7,8,9]. The synthesis of silver nanoparticles (AgNP) with different sizes and shapes has been considered in the past with special interest in various fields of research due to their potential to Recently, many researchers have been using plant or herbal extracts like neem [26], Aloe vera [27], Phyllanthus [28], turmeric [29], seaweeds [30], coffee, and tea [31] as reducing agents for the synthesis of AgNP. Researchers have been shown to isolate the bioactive molecules from the Aloe vera plant extract using
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