Abstract
The sensors based on Nickel oxide doped chromic oxide (NiO: Cr2O3) nanoparticals were fabricated using thick-film screen printing of sol-gel grown powders. The structural, morphological investigations were carried out using XRD, AFM, and FESEM. Furthermore, the gas responsivity were evaluated towards the NH3 and NO2 gas. The NiO0.10: Cr2O3 nanoparticles exhibited excellent response of 95 % at 100oC and better selectivity towards NH3 with low response and recovery time as compared to pure Cr2O3 and can stand as reliable sensor element for NH3 sensor related applications.
Highlights
Metal oxides have wide band gaps because of significant contribution of ionic character to the chemical bonds between the metallic cations and oxide ions
The phase identification and structural changes were investigated with the help of X-ray diffraction (XRD) technique
Pure Cr2O3 and NiO doped Cr2O3 nanoparticles film sensors were synthesized by using sol-gel and screen printing routes
Summary
Metal oxides have wide band gaps because of significant contribution of ionic character to the chemical bonds between the metallic cations and oxide ions. A transparent conducting oxide is a wide band-gap semiconductor that has a relatively high concentration of free electrons in its conduction band. These arise either from defects in the material or from. Metal oxides as nanoparticles can exhibit unique chemical properties due to their limited size and high density of surface atoms [2]. For nanoparticles of Cr2O3, though toxic [3] it can be widely used in fields such as catalyst [4], coating, wear and corrosion resistance [5], advanced colorant [6], H2 absorption material [7] and so on. It is significant to find an economical process which can be used to prepare them on a large scale
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