FTIR, XRD and ac impedance spectroscopic study on PVA based polymer electrolyte doped with NH4X (X=Cl, Br, I)

Development of Room Temperature Operating NH3 Gas Sensor Based on Free Standing PPy-PVA Composite Films

“…The band at 779.8 cm -1 is due to C-H out-of-plane deformation of pyrrole [16,18] while the band at 674.9 cm -1 is due to O-H twisting of PVA. The C-H out-of-plane deformation of pyrrole and Fe-O stretching band [19,20]. The assignment of these peaks and all these observations support that the synthesized product is a PPy-PVA composite.…”

“…The bands appear in the region 3300 -3400 cm -1 due O-H stretching of PVA and N-H stretching of pyrrole ring [16][17][18][19][20][21], absorption peaks at 2944.1cm -1 due to CH stretching and CH 2 stretching [19], the peak around 1630 are due C=C stretching of pyrrole [16]. The band at 1632, 3 cm -1 is due to C=C of pyrrole and deformation vibration of the absorbed water molecules [18,20], the shoulder at 1544.62 cm -1 C=C stretching of pyrrole [16], the small band at 1444.6 cm -1 is due to in plane deformation O-H and C-H of PVA and stretching C-N of pyrrole, the peak around 1371.2 cm -1 correspondence to CH 2 wagging of PVA [18], due to O-H in plane deformation with CH wag of PVA and C-C stretching of pyrrole peak is occurring at 1312.2 cm -1 [19], the band at 1236.2 cm -1 is due to C-O-H in plane deformation of pyrrole [21], the band at 1178 cm -1 is due to C-C stretching of pyrrole [16], the band at 1094 cm -1 is due to C-O stretching of PVA and C-H stretching of pyrrole [19].A new strong band at 1035.6 cm -1 is observed in the composite film compared to the PVA and PPy which is evidence for the formation of the PPy-PVA composite film [20,21]. The band at 914.1 cm -1 is due to CH 2 rocking [20] and the strong characteristic band at 852.6 cm -1 is due to PVA skeletal band and C-H out-of-plane deformation of pyrrole [16,17].…”

Temperature Dependent1H NMR Study of PVA: NH4X (X = Cl, Br, I) Polymer Electrolyte

“…Free standing, flexible films of PVA: NH 4 X (X=Cl, Br, I) have been prepared by solution casting technique using Dimethylsulphoxide (DMSO) solvent 5) . XRD pattern have been recorded using a Philips X-ray diffractometer (model PW 1390) with Cu K radiation ( = 1.5418 Å) at 40 kV and 30 mA in the 2 range of 5º to 80º with scan speed of 2°/min and the step of 0.02°.…”

“…The XRD pattern of pure PVA and its complexes with NH 4 Cl, NH 4 Br, and NH 4 I possessing highest conductivity 5) are shown in figure-2(a, b, c, d) respectively. The increased broadness and decreased intensity (indication of amorphous nature of the polymer electrolyte) has been found to be more for NH 4 I doped PVA polymer electrolyte system compared to other two systems.…”

“…The sharp peak centered at 2.9 ppm is attributed to methyl proton 9) of the solvent DMSO which acts as a plasticizer thereby enhancing the chain flexibility (hence the conductivity of the polymer) 5) . The peak centered at 3.8 ppm is attributed to the alcoholic proton of the host polymer 10) .…”