Rare earth(Sm3+) doped CoCr2O4 ceramics sensor towards room temperature detection of greenhouse methane gas

Abstract

Increased fossil fuel consumption in today's high-tech society has led to a rise in atmospheric concentrations of greenhouse gases that must be a mitigated. To get there, we need sensors that can report on atmospheric concentrations of greenhouse gases. Rare earths are used in the renewable energy technologies such as greenhouse gases, wind turbines, batteries, catalysts and electric cars. Current mining. Focusing greenhouse gases in mind we have synthesized samarium (Sm3+) doped CoCr2O4 by solution combustion method. Samples was characterized by X-ray diffractogram to know about crystallinity and phase formation. Once we know about the phase the same samples were subjected to characterize scanning electronic microscopy to know the morphology. Fourier transform infrared spectroscopy, analysis are used to examine the stretching vibration bonds. The methane gas sensing performance of the CoCr2-xSmxO4 samples are examined for different concentration of methane gas. The methane gas sensing responses with a function of applied methane gas concentrations varies form 50 ppb–500 ppb levels. The x = 0.02 exhibits an enhanced gas sensing performance 90% in contrast with the pure x = 0.00 sample in the order of 16%. The higher gas sensitivity value in sample is due to the enhanced change in resistance value in the existence of methane gas. Further quick response and recovery times were observed in the order of 65 and 86 s. The sensor created in this study has the potential to be used to detect low amounts of greenhouse methane gas because to its good conductivity, superior sensing capability, and improved mechanical qualities. The importance of these materials as low power consumption gas sensors at ambient temperature is demonstrated by the increased sensing response and improved selectivity toward methane. It is possible that the establishment of a conductive network and synergetic - connections among the various phases of the hybrid system are responsible for the better sensing behaviour of the composite. These interactions help facilitate the delocalization of electrons.