Temperature coefficient of resistance (TCR) measurement on vanadium pentoxide (V₂O₅) nanoparticles

In this work, we varied molar concentrations (0.05M, 0.1M, 0.15M, and 0.2M) of vanadium pentoxide (V₂O₅) to synthesize nanoparticles by hydrothermal method. Structural properties were studied using X-ray diffraction spectroscopy (XRD) and Transmission electron microscopy (TEM). XRD and TEM confirmed the increase in particle size with increasing molar concentrations with no secondary phases. Optical properties were studied using Photoluminescence and absorption measurements. Bandgap energy of nanoparticles was found to decrease from 2.25 eV to 2.20 eV with increasing molar concentration. Elemental composition was analyzed by X-ray photoelectron spectroscopy (XPS). The electrical conductivity of nanoparticles was found to increases with increasing molar concentration and also with increasing annealing temperature. The resistivity of nanoparticles (0.05M, 0.1M, 0.15M, and 0.2M) with different temperatures from 293K to 393K was measured. The temperature coefficient of resistance (TCR) value of -2.39%/K and resistivity of 0.1 Ohm-cm for 0.2 M concentration of vanadium pentoxide nanoparticles were obtained. We will discuss the significance of TCR obtained in the microbolometer application.