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Journal of Nanostructure in Chemistry Fig. 1 UV–Vis spectra (a) and FE-TEM images of S-AgNPs (b) Fig.3 Particle size distribution (a) and zeta potential result of S-AgNPs (b) AgNPs synthesized from other six plant extract is shown in supplementary figures (Figs. S1, S2 and S3) The histogram for the particle size distribution of S-AgNPs is depicted in Fig. 3a. The DLS analysis revealed the S-AgNPs with an average diameter of 87.46 nm in the aqueous colloidal solution. The DLS analysis shows that two peaks of parti- cle dimension is most likely because the produced particles are of different shapes and sizes. The polydispersity index was found to be 0.48. The zeta potential is used to depict the surface charge and stability of S-AgNPs. As shown in Fig. 3b, the biosynthesized S-AgNPs had a negative charge with a zeta potential value − 25.5 mV. This zeta potential value falls within the range of − 20 to − 30 mV is considered as moderately stable [24], which clearly indicated that the synthesized S-AgNPs was moderately stable in nature. The X-Ray diffraction pattern of S-AgNPs was shown in Fig. 4a. XRD pattern showed the peaks at 2 values of 38.11°, 44.27°, 64.42°, 77.47° and 81.53° corresponding to the (111), (200), (220), (311) and (222) reflections facets of the cubic crys- talline structure. This pattern was like the Braggs’s reflec- tion of pure crystalline silver. All these distinct diffraction peaks correspond to the reflection of face-centered cubic (fcc) standard silver (JCPDS, PDF#04-0783), indicated the formation of S-AgNPs. The additional peaks which appeared in XRD are possibly due to the plant bioactive compounds which get coated on to the surface of AgNPs. The XRD result is corresponding to the result in SAED. The appear- ance of a circular ring in SAED pattern further confirms the crystalline nature of S-AgNPs (Fig. 4b). The findings are in accordance with the previously reported work, wherein green synthesis of S-AgNPs from different plant extract has been reported [20, 21, 23]. Fig.2 Elemental mapping result of S-AgNPs, showing distribu- tion of silver in respective nanoproducts (a, b) and EDX spectrum of S-AgNPs (c) Table 1 Element C K Cu K Ag L EDAX analysis of S-AgNPs Weight (%) 25.91 38.50 35.59 Atomic (%) 69.74 19.59 10.67 chemical elements present in EDX spectrum of S-AgNPs are represented in Table 1. The results are in line with the previ- ously reported work [22, 23]. The characterization data of 13PDF Image | green silver nanoparticles from leaf used as UVb protection
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