synthesis, structural evaluation of molybdenum oxide (moo3) nanoparticles and its application as co2 gas sensor

In the present study we report a simple eco-friendly hydrothermal protocol for the synthesis of molybdenum oxide (moo3) nanoparticles at various temperatures i.e., 80-200 °c at intervals of 20 °c designated as s1-s6 sequentially with time duration of 4 h for each batch. the synthesized samples were characterized by x-ray fluorescence (xrf), x-ray diffraction (xrd), fourier transform infra-red (ftir), uv- visible diffuse reflectance (uv-vis drs), laser raman, cyclic voltammetry (cv), x-ray photoelectron spectroscopy (xps) and transmission electron microscopy (tem) to find out their elemental composition, structure, morphology and the optical band gap. the xrd analysis indicates well-crystallized orthorhombic structure with preferred orientation along (210) plane. the presence of o-mo-o stretching vibration was observed by ftir analysis the gas sensing studies were carried out to examine the material’s sensitivity over a temperature range of 50oc to 400oc for various gas concentrations i.e. 200-1000 ppm of co2 gas. the sensor had a sensitivity of s=68.5% for s4 sample at an optimum temperature of 200 °c. the adsorption of desired gas on the material correlated well with the particle size of material at different temperature. the response and recovery times were 50 s and 40 s respectively.