Abstract
The fabrication of monolayer of carbon atoms(rGO) composites is the cause of their poor performance in humidity sensors, which requires immediate investigation. An attempt is made here to construct a cobalt chromate(CCR)-rGO composite. For large-scale manufacture of CCR-rGo composite, the technique is simple, cost-effective, and uncomplicated. The increased room temperature operable humidity sensing responsiveness of rGo-CCR composite is explored in this study. We have adopted a simple method for producing reduced graphene oxide(rGO) on a wide scale has been discovered. For the first time, this has been accomplished using the combustion process. The sugar solution (ten grams of sugar and thirty millilitres of distilled water) was held at 450 °C in the muffle furnace for ten minutes. The current techniques for synthesizing rGO are straightforward and environmentally safe because no hazardous chemicals, metal catalysts, or solvents are used. Furthermore, this technology provides a low-cost, high-yielding route for preparing rGO. Further CCR were synthesized by solution combustion method. Crystallinity, phase and structural analysis are carried out using X-ray diffraction (XRD). The SEM micrographs shows that ultrathin, wrinkled, paper-like, sphere shape, rod shape morphology. In addition to this, the EDX method was utilised in order to investigate the spatial distribution of the element. The most extraordinary sensing response for CCR-rGO between 11% and 97% relative humidity(RH)was 92%. The compound's response time was discovered to be 40 and 60 s, and the stability was examined over three months. Various adsorption process phases are used to describe the mechanism of humidity sensing schematically.
•For the first time, rGo spheres have been successfully produced using the combustion method.•Combustion method is provides a low-cost, high-yield route to producing rGO.•The morphology of the rGo seems to be rods can be observed to be very thin, wrinkled, and paper-like.•CoCr2O4 and rGO composite exhibits exceptional sensing response was 92% between 11% and 97% RH.•The compound's stability was evaluated over three months, and its reaction time was found to be between 40 and 60 s