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Processes 2020, 8, 388 7 of 14 3.4. SEM and TEM Analysis SEM analysis was done to check the dimensions and shape of the nanoparticles. The AgNPs synthesized from Nigella sativa were of uniform size disseminated evenly and spherical in shape (Figure 3A,B). The result of SEM analysis of biosynthesized silver nanoparticles from extract was obviously differentiable due to their size difference. The current results were in accordance with that of Otunola et al. justified the similar range of Ag NPs from pepper and garlic [31]. EDX technique was used to observe the elemental composition of biosynthesized Ag nanoparticles in solution. In X-ray spectrum, all the elements showed a unique set of peaks with different atomic structure as shown in (Figure 3C). Meanwhile, silver metal exhibited a strong signal in EDX image and weight percent 40% clearly indicated the presence of metallic silver nanocrystals (Figure 3C,D). TEM [32]. TEM was used to determine the biosynthesized AgNPs (Appendix A) in nanoscale from 246 (Figure 3A, B). The result of SEM analysis of biosynthesized silver nanoparticles from extract was Processes 2019, 7, x FOR PEER REVIEW 7 of 14 The most appropriate microscopic technique to investigate the size and morphology of AgNPs is 247 obviously differentiable due to their size difference. The current results were in accordance with that between 8 and 80 nm, smaller size of particle good indicator for effective performance and quality of extract. TEM analysis confirmed the presence of AgNPs in the sample of N. sativa average size ranging 248 of Otunola et al. justified the similar range of Ag NPs from pepper and garlic [31]. EDX technique AgNPs (Figure 4A,B). The previous report also showed that the AgNPs obtained from seed extract of 249 was used to observe the elemental composition of biosynthesized Ag nanoparticles in solution. In X- Phoenix dactylifera were mostly spherical in shape and similar sizes ranging [33]. Another pioneer study 250 ray spectrum, all the elements showed a unique set of peaks with different atomic structure as shown result revealed that TEM image of AgNPs were found similar shape and with narrow distribution [34]. 251 in (Figure 3C). Meanwhile, silver metal exhibited a strong signal in EDX image and weight percent DLS was also used to investigate the particle size distribution, and revealed the particle size 8–80 nm 252 40% clearly indicated the presence of metallic silver nanocrystals (Figure 3C,D). with average particle size 55 nm, as shown in (Figure 4C). Similar size distribution studies have been reported previously [33]. Figure 3. SEM and EDX images of synthesized AgNPs. (A,B) SEM micrograph of AgNPs at lower (X3000), and higher magnification (X12000), (C,D) represent EDX images and weight % of elements. 253 254 Figure 3. SEM and EDX images of synthesized AgNPs. (A) and (B) SEM micrograph of AgNPs at 255 lower (X3000) ,and higher magnification (X12000), (C, D) represent EDX images and weight % of 256 elements. 257 The most appropriate microscopic technique to investigate the size and morphology of AgNPs 258 is TEM [32]. TEM was used to determine the biosynthesized AgNPs (Appendix A) in nanoscale from 259 extract. TEM analysis confirmed the presence of AgNPs in the sample of N. sativa average size 260 ranging between 8 and 80 nm, smaller size of particle good indicator for effective performance and 261 quality of AgNPs (Figure 4A, B). The previous report also showed that the AgNPs obtained from 262 seed extract of Phoenix dactylifera were mostly spherical in shape and similar sizes ranging [33]. 263 Another pioneer study result revealed that TEM image of AgNPs were found similar shape and withPDF Image | Silver Nanoparticles Seed Extract Nigella sativa blackseed
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