Nicolet is10

The pure PVA and doped PVA samples were analysed based on an FTIR spectrophotometer (Thermo Scientific, Nicolet iS10, (Perkin Elmer, Waltham, MA, USA) in the wavenumber region 4000–400 cm⁻¹ with 2 cm⁻¹ resolution.

Fourier transforms infrared (FTIR, Thermo Scientific, Nicolet iS10,Perkin Elmer, Waltham, MA, USA) spectroscopy measurements were carried out via a Spotlight 400 Perkin-Elmer system with a resolution of 1 cm⁻¹ (450–4000 cm⁻¹). The electrical impedance properties of the prepared SPE films were analyzed at room temperature, using a HIOKI 3532–50 LCR HiTESTER controlled by a computer via software over the frequency range of 42 Hz to 5000 kHz. From the computer, the measurements as well as the analysis of both the imaginary and real parts of the impedance spectra could be performed. Discs with a diameter of 20 mm were prepared from the SPE films, and then sandwiched between a pair of stainless steel electrodes under spring pressure.