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Polymers 2020, 12, 1155 5 of 16 sPpoelycmtrerusm202o0f, 1n2e, axtFPOSR-PEMERMRAEVcIoEWuld be due to the ability of the AgNPs to be stabilized by the acr5yloafte16, C=C, and O–H bonds [42]. Generally, from the FT-IR results obtained, it can be suggested that MWI can be suggested that MWI promoted more interfacial interaction between the nanosheets and the promoted more interfacial interaction between the nanosheets and the polymer matrix by inducing polymer matrix by inducing more electron chain transfer sites. more electron chain transfer sites. 3.2. XRD Figure 1. FT-IR spectra of (a) polystyrene (PS)-polymethylmethacrylate (PMMA), (b) reduced Figure 1. FT-IR spectra of (a) polystyrene (PS)-polymethylmethacrylate (PMMA), (b) reduced graphene oxide (RGO)/silver nanoparticles (AgNPs), (c) RGO/AgNPs-(PS-PMMA), and (d) R-(GO- graphene oxide (RGO)/silver nanoparticles (AgNPs), (c) RGO/AgNPs-(PS-PMMA), and (d) 3.2. XRD (PS-PMMA)-AgNPs. R-(GO-(PS-PMMA)-AgNPs. To carry out a further investigation of the size and structure of the RGO/AgNPs in the polymer To carry out a further investigation of the size and structure of the RGO/AgNPs in the polymer matrix, the XRD patterns were obtained. Figure 2 depicts the XRD patterns for the prepared AgNPs, matrix, the XRD patterns were obtained. Figure 2 depicts the XRD patterns for the prepared AgNPs, RGO/AgNPs, RGO/AgNPs-(PS-PMMA), and R-(GO-(PS-PMMA))/AgNPs nanocomposites. As can be RGO/AgNPs, RGO/AgNPs-(PS-PMMA), and R-(GO-(PS-PMMA))/AgNPs nanocomposites. As can seen from XRD (Figure 2a), the pure AgNPs show a crystalline nature with an FCC structure, exhibiting be seen from XRD (Figure 2a), the pure AgNPs show a crystalline nature with an FCC structure, peaks corresponding to (111), (200), (220), and (311) planes. These results are in good agreement with exhibiting peaks corresponding to (111), (200), (220), and (311) planes. These results are in good the previous literature values for silver nanoparticles and JCPDS No.00-003-0921. The crystalline agreement with the previous literature values for silver nanoparticles and JCPDS No.00-003-0921. XRD pattern of the AgNPs (Figure 2a) exhibits peaks at 2θ values of approximately 38.1◦ (111), 44.4◦ The crystalline XRD pattern of the AgNPs (Figure 2a) exhibits peaks at 2θ values of approximately (200), 64.5◦ (220), and 77.5◦ (311). As for the RGO/AgNPs-(PS-PMMA) nanocomposites (Figure 2c), 38.1° (111), 44.4° (200), 64.5° (220), and 77.5° (311). As for the RGO/AgNPs-(PS-PMMA) it is difficult to find the AgNPs in the XRD pattern, as the RGO/AgNPs-(PS-PMMA) nanocomposites nanocomposites (Figure 2c), it is difficult to find the AgNPs in the XRD pattern, as the RGO/AgNPs- exhibited a broad reflection and typical amorphous nature, which could be due to the low silver (PS-PMMA) nanocomposites exhibited a broad reflection and typical amorphous nature, which could concentration in the nanocomposites and the detection threshold of the XRD instrument. This could be due to the low silver concentration in the nanocomposites and the detection threshold of the XRD suggest that the filler (i.e., AgNPs) was inserted within the RGO/(PS-PMMA) matrix. In the case of the instrument. This could suggest that the filler (i.e., AgNPs) was inserted within the RGO/(PS-PMMA) prepared R-(GO-(PSPMMA))/AgNPs nanocomposites (Figure 2d), the diffraction peaks of metallic Ag matrix. In the case of the prepared R-(GO-(PSPMMA))/AgNPs nanocomposites (Figure 2d), the were detected, while the GO and RGO peaks disappeared. This could confirm the formation of AgNPs diffraction peaks of metallic Ag were detected, while the GO and RGO peaks disappeared. This could and the reduction of GO. Additionally, it could suggest that the RGO/AgNPs sheets were exfoliated confirm the formation of AgNPs and the reduction of GO. Additionally, it could suggest that the within the copolymer matrix. Moreover, the lower intensity and broadening of peaks reflected the RGO/AgNPs sheets were exfoliated within the copolymer matrix. Moreover, the lower intensity and high degree of crystallinity and related to the smaller particle size of the AgNPs. broadening of peaks reflected the high degree of crystallinity and related to the smaller particle size Furthermore, the average size of AgNPs and RGO/AgNPs (i.e., for the (111) peaks) was found to of the AgNPs. be ~46 and 15 nm, respectively. As for the R-(GO-(PS-PMMA))/AgNPs nanocomposites, the particle Furthermore, the average size of AgNPs and RGO/AgNPs (i.e., for the (111) peaks) was found size was found to be ~7.5 nm. Meanwhile, the average size of RGO/AgNPs-(PS-PMMA) could not be to be ~46 and 15 nm, respectively. As for the R-(GO-(PS-PMMA))/AgNPs nanocomposites, the calculated as the peaks were amorphous. It was also observed that the particle size was found to be particle size was found to be ~7.5 nm. Meanwhile, the average size of RGO/AgNPs-(PS-PMMA) could smaller for R-(GO-(PS-PMMA))/AgNPs nanocomposites compared to that of AgNPs. The reduction in not be calculated as the peaks were amorphous. It was also observed that the particle size was found to be smaller for R-(GO-(PS-PMMA))/AgNPs nanocomposites compared to that of AgNPs. The reduction in intensity and widening of peaks in the AgNPs/polymers (Figure 2b–d) reflect a decrease in the particle size of the polymer/AgNPs in comparison to AgNPs (Figure 2a).PDF Image | Microwave Irradiation Synthesis Silver Nanoparticle
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