A facile synthesis of Cr doped WO3 nanocomposites and its effect in enhanced current-voltage and impedance characteristics of thin films

Abstract

In this study we report the enhanced impedance and current-voltage (I-V) characteristics of Cr doped WO3 in different % weight (5, 8, 15 wt.%) ratio, synthesized by co- precipitation method using surfactants. Nanostructures (NS) were characterized by cyclic voltammetry (CV), scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Visible (UV-Vis) spectroscopy. The pelletized samples performed I-V and impedance measurements. The impedance results reveal that the pelletized samples of highest doped Cr showed remarkable increase in the admittance with respect to the biased voltage. I-V characteristics of the highest doped Cr showed enhanced surface conductivity as compared with the observed resistance and applied current. The output power considerably increases for 15 wt.% of Cr doped WO3 and as the doping percentage of Cr increases surface conductivity, power output, admittance values considerably enhances in the material matrix. This work demonstrated that Cr doped WO3 has more current sensitivity and selectivity towards I-V, impedance, admittance value which considerably varies with the applied bias voltage. Nano particles (NPs) of Cr-WO3 can be a versatile material for the superconductor, biosensors, sensing of various gases as its greater value of impedance can help in its use in electronic devices stimulus detection of various gases and super capacitor applications.