Facile synthesis of SnO2-Fe2O3 core-shell nanostructures and their 2-methoxyethanol gas sensing characteristics
Autor: | Madhukar Poloju, Nagabandi Jayababu, M. V. Ramana Reddy |
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Rok vydání: | 2019 |
Předmět: |
2-Methoxyethanol
Materials science Nanostructure Fabrication Mechanical Engineering Metals and Alloys Shell (structure) Nanoparticle Nanotechnology Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Core (optical fiber) chemistry.chemical_compound chemistry Mechanics of Materials Materials Chemistry 0210 nano-technology Porosity |
Zdroj: | Journal of Alloys and Compounds. 780:523-533 |
ISSN: | 0925-8388 |
Popis: | Numerous health hazards arising from the exposure of 2-methoxyethanol (2-ME) and lack of best performing 2-ME sensors pushed us to develop a sensor that can sense 2-ME gas very efficiently. SnO2-Fe2O3 core-shell nanoparticles (CSNPs) were prepared using two step process, in first step core was prepared by co-precipitation method and in the second step the shell was developed by simple sol-gel method. Structural, morphological and compositional studies were carried out systematically and confirmed the perfect formation of core-shell structures with sizes around 18 nm. Further, it revealed that 4 nm Fe2O3 shell was uniformly coated on SnO2 core which demonstrated the formation of heterostructures. Gas sensing properties of fabricated sensors (pure SnO2, Fe2O3 nanoparticles (NPs) and SnO2-Fe2O3) were investigated at room temperature towards various toxic gases. SnO2-Fe2O3 gas sensor has shown tremendous response (∼2080) towards 100 ppm 2-ME gas at room temperature which was much higher than pure NPs based sensors. Response and recovery times of SnO2-Fe2O3 sensor also measured and found to be 43 s and 23 s respectively. Long term stability of the SnO2-Fe2O3 sensor during the first 30 days of its fabrication was tested. Enhanced sensing performance of SnO2-Fe2O3 sensor was attributed to the n-n heterostructures formed between SnO2 core and Fe2O3 shell and porous outer surface of the sensor. All the results suggested that the SnO2-Fe2O3 sensor has great potential for applications in designing practical 2-ME gas sensors. |
Databáze: | OpenAIRE |
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