Synthesis and tuning the structural, morphological and dielectric characteristics of PVA-CMC-SiO2–Cr2O3 hybrid nanostructures for nanoelectronics devices

摘要

Abstract The current study aims to process silicon dioxide (SiO2) and chromium trioxide (Cr2O3) nanostructures doped polyvinyl alcohol (PVA), and carboxymethyl cellulose (CMC) blend as promising nanostructures to apply for nanoelectronics devices and pressure sensors with low cost and excellent chemical and physical characteristics compared of other nanomaterials. Nanostructures of (PVA-CMC-SiO2–Cr2O3) were examined for their structural, morphological, and dielectric properties. Scanning electron microscope (SEM) images of (PVA-CMC-SiO2–Cr2O3) nanocomposites (NCs) reveal many aggregates or chunks that are homogenous and coherent on the top surface. When the proportion is (8 wt), optical microscope images reveal that inside the polymers, (SiO2–Cr2O3) nanoparticles build a continuous network once compared to pure (PVA-CMC) film. Fourier transform infrared ray (FTIR) indicated a shift in peak location and a peak shape and intensity modification. The electrical properties of alternating current demonstrate that the dielectric constant (ε′) and dielectric loss (ε″) of nanocomposites drop as the frequency of the applied electrical field increases but increases when the concentration of nanoparticles (NPs) increases. The dielectric constant and AC electrical conductivity (σa.c) of (PVA-CMC) blend enhanced by about 100 and 150, respectively, when the (SiO2–Cr2O3) content reached (8 wt) at a frequency (f = 100 Hz). The obtained results indicated that the doping (PVA-CMC) with (SiO2–Cr2O3) NPs improved the structural and AC electrical conductivity, which made the (PVA-CMC-SiO2–Cr2O3) nanostructures promising materials for various electrical nanodevices. Compared to existing pressure sensors, the (PVA-CMC-SiO2–Cr2O3) nanostructures demonstrated superior pressure sensitivity, great flexibility, and strong environmental resilience.