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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 Abstract  Shape and size-controlled synthesis of silver nanoparticles using  Aloe vera  plant extractElectronic supplementary material  The online version of this article (doi:10.1186/s11671-016-1725-x) contains supplementary material, which is available to authorized users.

Shape- and Size-Controlled Synthesis of Silver Nanoparticles Using Aloe vera Plant Extract and Their Antimicrobial Activity