首页|Multi-functioning of CeO2-SnO2 heterostructure as room temperature ferromagnetism and chemiresistive sensors
Multi-functioning of CeO2-SnO2 heterostructure as room temperature ferromagnetism and chemiresistive sensors
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NSTL
Elsevier
? 2022 Elsevier B.V.Fabrication of novel materials with multi-functional active structure properties that can be used for gas sensing with augmented sensitivity, quick response-recovery rates and improved selectivity still present significant scientific challenges. The continuing interest in the design of such materials is driven by the increased emission of toxic gases in the industrial processes that result in detrimental threats to public health and environmental sustainability. Thus, the realisation in fabricating these materials for functional spin-based information processing devices remains indefinable due to numerous fundamental challenges. Consequently, in this work, we report on the room temperature chemiresistive gas sensing and ferromagnetism active structure based on the designed heterostructured CeO2-SnO2 nano-oxide interface. We elucidate that the optimised sensing material (CeO2-SnO2-300 °C), annealing at 300 °C, can detect ammonia (NH3) gas at low concentration (parts-per-million, ppm) levels with rapid response-recovery times and improved sensitivity. The excellent selectivity towards NH3 amongst other gases, such as CO, CH4, H2, H2S, ethanol and NO2, ensures adequate safety in detecting NH3 hazards. Based on the NH3 sensing characteristics, the tentative sensing mechanism was postulated. Moreover, the well-defined room temperature ferromagnetism (RTFM) was observed for mixed CeO2-SnO2-300 nano-oxide. The enhanced gas sensing response and RTFM were attributed to the concomitant structural improvements resulting from the high surface area, the relative concentration of oxygen vacancies and Ce3+ ions at the surface of CeO2 for the CeO2-SnO2-300 °C sample. These findings provide additional insights into the design of novel multi-functional nanomaterials with striking magnetic ordering and enhanced gas sensing.
HeterostructureMetal oxidesNH3 gas sensingSpintronics
Department of Physics University of the Free State
Centre for Nanostructures and Adavanced Materials DSI-CSIR Nanotechnology Innovation Centre Council for Scientific and Industrial Research
Solid State Physics Dept. National Research Centre
Electron Microscopy Unit University of the Western Cape
National Metrology Institute of South Africa (NMISA) CSIR Campus
Department of Chemistry University of Limpopo
School of Electronic Science and Technology Institute for Sensing Technologies Key Laboratory of Liaoning for Integrated Circuits Technology Dalian University of Technology
NSTL
Elsevier
