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Polymers 2020, 12, 440 Polymers 2020, 12, 440 PVP Ag-NPs/PVP 4 h 4000 3500 3000 2500 2000 1500 1000 500 Wavenumber (cm-1) 6 of 15 6 of 15 Ag-NPs/PVP 4 h PVP (a) 4000 3500 3000 2500 2000 1500 1000 500 Wavenumber (cm-1) (a) (b) Figure 2. Chemical structure of Ag‐NPs/PVP: (a) FTIR spectra of PVP and Ag‐NPs/PVP reacted for 4 h; (b) the major reaction scheme of Ag/PVP. The XRD patterns (Figure 3) showed 2θ at approximately 22° were the diffuse peaks of PVP and Ag‐NPs/PVP samples. The diffraction peaks at 2θ = 38°, 44°, 64.3°, and 77.3° in Ag‐NPs/PVP curve correspond to the face‐centered cubic (FCC) silver plane (111), (200), and (220), respectively. The average crystal size of Ag‐NPs estimated by Sch(be)rrer formula was 14.88 nm, which was consistent with the actual silver nanoparticles size range (13–28 nm) observed by TEM. The analysis results Figure 2. Chemical structure of Ag‐NPs/PVP: (a) FTIR spectra of PVP and Ag‐NPs/PVP reacted for 4 Figure 2. Chemical structure of Ag-NPs/PVP: (a) FTIR spectra of PVP and Ag-NPs/PVP reacted for 4 h; show that the small size Ag‐NPs protected by PVP exist stably in DMAc solution. h; (b) the major reaction scheme of Ag/PVP. (b) the major reaction scheme of Ag/PVP. The XRD patterns (Figure 3) showed 2θ at approximately 22° were the diffuse peaks of PVP and Ag-NPs/PVP 4 h Ag‐NPs/PVP samples. The diffraction peaks at 2θ = 38°, 44°, 64.3°, and 77.3° in Ag‐NPs/PVP curve PVP correspond to the face‐centered cubic (FCC) silver plane (111), (200), and (220), respectively. The average crystal size of Ag‐NPs estimated by Scherrer formula was 14.88 nm, which was consistent with the actual silver nanoparticles size range (13–28 nm) observed by TEM. The analysis results show that the small size Ag‐NPs protected by PVP exist stably in DMAc solution. Ag-NPs/PVP 4 h PVP 10 20 30 40 50 60 70 80 2 Theta (degree) Figure 3. XRD patterns of PVP and Ag-NPs reacted for 4 h. Figure 3. XRD patterns of PVP and Ag‐NPs reacted for 4 h. 3.2. Analysis of Films’ Surface Morphology and Properties The scheme of Ag-NPs growth and cross-link with cellulose in film-forming process were summarized as shown in Figure 4b. The average size of Ag-NPs calculated by XRD patterns (Figure 5) PVP PVP 3435 Intensity (a.u.) Intensity (a.u.) (200) (200) 1655 (220) (311) (220) (311) (111) 2955 2921 2955 2859 2921 (111) 2859 1423 1289 1419 1284 1423 1289 1419 1284 Absorbance (a.u.) Absorbance (a.u.) 1669 1669 1655 3435 10 20 30 40 50 60 70 80 is larger than the average particle size of Ag-NPs in Ag-NPs/PVP solution, demonstrating that Ag-NPs 2 Theta (degree) continued to grow within film formation process. The –SH group in MPTS reacted with Ag to form a betterbondingstructure(Figiguurere3.4XaR)D,apnadttetrhnesosiflPoVxPanaendgArogu‐NpPosfreMacPteTdSfowra4sh.bondedtocellulose[37,38]. The chemical bonding effect of MPTS makes cellulose and Ag-NPs more easily cross-linked. It can be seen that some nanoparticles exist on the cross-section of the CANF0.04 compared with RCF (Figure 4e,f). These particles combined with cellulose forming a multilayer Ag-MPTS-CellulosePDF Image | One-Pot Synthesis of Antibacterial Silver Nanoparticle
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