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Nanomaterials 2020, 10, 376 7 of 22 which can be due to an increase of the number of nanoparticles formed. The position of the SPR band Nanomaterials 2020, 10, x FOR PEER REVIEW 7 of 22 remains practically unchanged as the temperature and silver precursor concentration increase. XPSAnallysiis XPS charracctteerriizzaattioionnwaasspeerrffoorrmeeddttooprroovveebootthttheerreduccttiioonoffGO and tthe fformattiion off AgNPs. XPS survey spectra of GO and the GO–AgNP-A nanohybrid are shown in Figure 2a. For both AgNPs. XPS survey spectra of GO and the GO–AgNP-A nanohybrid are shown in Figure 2a. For both samples, the peaks observed at 284.4 eV and 531.4 eV are associated with the peaks of C1s and O1s, samples, the peaks observed at 284.4 eV and 531.4 eV are associated with the peaks of C1s and O1s, respectively. The new peaks at about 368 eV and 374 eV that appear in the spectra of GO–AgNP-A respectively. The new peaks at about 368 eV and 374 eV that appear in the spectra of GO–AgNP-A belong to Ag3d. The high-resolution C1s XPS spectra for GO and GO–AgNP-A are displayed in belong to Ag3d. The high-resolution C1s XPS spectra for GO and GO–AgNP-A are displayed in Figure 2b,c. By comparing the two spectra, it can be observed that there is a remarkable reduction in Figure 2b,c. By comparing the two spectra, it can be observed that there is a remarkable reduction in C-O peak intensities, a narrowing of the C-C signal, and the appearance of the shake-up satellite at C-O peak intensities, a narrowing of the C-C signal, and the appearance of the shake-up satellite at about 290.5 eV, characteristics of the aromatic C-C. These results suggest the partial reduction of GO about 290.5 eV, characteristics of the aromatic C-C. These results suggest the partial reduction of GO during the synthesis of the GO–AgNP nanohybrids. The Ag3d spectrum for the GO–AgNP during the synthesis of the GO–AgNP nanohybrids. The Ag3d spectrum for the GO–AgNP nanohybrid nanohybrid shows the peaks of Ag3d5/2 and Ag3d3/2 at 368.4 and 374.4 eV, respectively (Figure 2d), shows the peaks of Ag3d5/2 and Ag3d3/2 at 368.4 and 374.4 eV, respectively (Figure 2d), indicating indicating that Ag exists in the metallic form. that Ag exists in the metallic form. Figure 2. XPS characterization of GO and GO–AgNP-A. (a) XPS survey spectra of GO and GO–AgNP- Figure 2. XPS characterization of GO and GO–AgNP-A. (a) XPS survey spectra of GO and GO–AgNP-A. A. (b) High-resolution C1s XPS spectrum of GO. (c) High-resolution C1s XPS spectrum of GO–AgNP- (b) High-resolution C1s XPS spectrum of GO. (c) High-resolution C1s XPS spectrum of GO–AgNP-A. A. (d) High-resolution XPS spectrum of Ag3d of GO–AgNP-A. (d) High-resolution XPS spectrum of Ag3d of GO–AgNP-A. Raman Analysis Raman Analysis GO and GO–AgNP nanohybrids were further characterized by Raman spectroscopy. Figure 3a GO and GO–AgNP nanohybrids were further characterized by Raman spectroscopy. Figure 3a shows the Raman spectra of GO and the GO–AgNP-A nanohybrid. shows the Raman spectra of GO and the GO–AgNP-A nanohybrid.PDF Image | Graphene Oxide–Silver Nanoparticle Nanohybrids
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