Dielectric Properties of Ultra-Low Dielectric Constant PVA-Pentaerythritol/MnO2 Nanocomposite

In this work, a simple method was employed to prepare MnO2 nanoparticles and characterized by various techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and atomic force microscope (AFM). The diffraction peak of MnO2 nanoparticles matched well with standard data. The AFM and SEM images prove the growth of MnO2 nanorods from the MnO2 nano spherical shape. An ultra-low dielectric constant PVA (P)-pentaerythritol (Ery) /MnO2 nanocomposite films are fabricated by evaporating casting method. The dielectric constant and losses of P-Ery/MnO2 films were measured between 10 kHz and 1 MHz using LCR, as the content of MnO2 increased, the dielectric constant decreased from 1.6 to 1.3 and the loss tangent of P-Ery at 400 KHz was very low and increase with increase of MnO2 content. Thermogravimetric analysis (TGA) and Scanning electron microscope (SEM) were used to investigate the thermal stability and surface analysis of films.