The XRD pattern recorded for silver nanoparticles shows four intense peaks in the whole spectrum of 2θ values ranging from 20 to 80. Fig. 2 shows that the XRD patterns obtained for the silver nanoparticles synthesized this Myristoylcarnitine method. The presence of intense peaks of nanoparticles (1 1 1), (2 0 0), (2 2 0) and (3 1 1) appeared which are indexed as crystalline silver face centered cubic phase. An average diameter of as-synthesized silver nanoparticle was calculated from the broadness peak of (2θ = 38) by using Scherrer equation D = Kλ/βcos θ, and ecotype is about 9.0 nm.
Fig. 2. XRD patterns of silver nanoparticles synthesized by treating Calendula officinalis with silver nitrate aqueous solution.Figure optionsDownload full-size imageDownload as PowerPoint slide
TEM images indicate that they are relatively uniform in diameter and spherical in shape (Fig. 3A). The histogram shows that the particles have a single size distribution with an average diameter of about 7.5 nm that confirms obtained data from XRD investigation (Fig. 3B).