## 3 Results and Discussion  
Photochemicals from _D. moldavica_ seed extract can be used as both reducing and capping agents to synthesize AgNPs. Figure 1 shows the _D. moldavica_ seeds extract mixed with Ag\({}^{+}\) before and after microwave irradiation, respectively [3]. In this study, the colorless AgNO\({}_{3}\) solution turned from yellow to brown or from pale yellow to black brown, indicating the formation of AgNPs, indicating the formation of Ag in the solution and excitation of surface plasmons [16]. Figure 1: Photograph of colloids; (**a**) _Draccephalum moldavica_ (L.) seed extract; (**b**) silver nitrate solution; (**c**) silver nanoparticle. The formation of man-sized Ag can be confirmed by employing optical absorption spectroscopy. In the present study, the AgNP mixture was transferred in to a cuvette for UV-visible radiation, and the medium absorbance was recorded. Due to surface plasmon resonance (SPR) phenomena, resonant peak occurs at a variety of wavelengths for various NPs mixture and, according to the theory of resonance maximum wavelength, is absorbed at resonant wavelengths [6; 24]. The previous studies suggest that a usual AgNP shows SPR patterns at wavelengths in the range of 400-480 nm. Figure 2 shows that SPR for the prepared mixture occurred at a wavelength of 443 nm, confirming the presence of AgNPs. SPR pattern of metallic nanoparticles depend on the stabilizing molecule, shape and size of particles present in the medium or upon inner particle distance and surrounding media [24; 29; 30]. Figure 3 presents an absorbance _vs._ 20 graph depicting XRD patterns of synthesized AgNPs. Three diffraction peaks as (111), (200), (220), and (311) were observed in the 2 h range of 30-80, indicated expressions of face centered cubic (fcc) structure metallic Ag, respectively. These observations reveal that synthesized AgNPs consist of pure crystalline Ag [31; 32; 33]. Similar XRD pattern reports were observed in the _Eclipta prostrate_, _Tribulus terrestris_, and _Prosopis juliflora_ extracts for synthesized AgNPs [13; 30; 33; 34; 35; 36; 37; 38]. FTIR analysis was used to identify and characterize probable biomolecules responsible for the reduction and capping of AgNPs achieved from the _D. molavica_ seed extract [3]. The biologically synthesized AgNPs and the powdered seeds were mixed with the potassium bromide to make a pellet. Figure 4 shows the FTIR spectra of pre-reaction dried _D. molavica_ seed extract without AgNO\({}_{3}\) (control), and the synthesized post-reaction AgNPs, with AgNO\({}_{3}\). Figure 3: X-ray diffraction (XRD) patterns of synthesized AgNPs. Figure 2: UV–Visible absorption spectrum of silver nanoparticles (AgNPs) solution observed at \(\sim\)450 nm as a function of Irradiation time. Both FTIR spectra show a shift in peaks: 1401-1396 (due to C-C in-ring stretching of aromatic amines), 1650-1616 (due to C-C=C- stretching of alkenes, and N-H bend of primary amines), 2928-2912 (corresponding to C-H stretching of alkanes, and O-H stretching of carboxylic acids), and 3352-3386 cm\({}^{-1}\) (due to N-H stretching of amines and amides, O-H stretching of alcohols and phenols). In addition, synthesized AgNPsPs showed strong band, specifically at a peak of 1067 cm\({}^{-1}\), related to aliphatic amines (C-N stretching vibration). In brief, FTIR analysis results showed the presence of alcohols, amides, alkanes, carboxyl, and phenols in synthesized AgNPs. A similar trend is observed in the synthesis of AgNPs using _Artocarpus heterophyllus_ Lam. [39] and _Abelmoschus esculentus_[33] seed extracts. The size and morphology of synthesized AgNPs were determined by TEM images, as shown in Figure 5. The morphology of AgNPsPs is almost spherical, and newly formed NPs exhibited high surface areas, an average size of 31 \(\pm\) 6 nm in the range of 5-50 nm, and monodispersity in terms of particle size. Figure 6 shows the FESEM images and EDX spectra of AgNPs. FSEM micrographs in Figure 6A reveal that aggregates of AgNPs are not indirect contact, indicating stabilization by capping agents.