Self-assembled alpha-Fe2O3-GO nanocomposites: Studies on physical, magnetic and ammonia sensing properties
- Authors
- Ghule, Balaji G.; Shinde, Nanasaheb M.; Raut, Siddheshwar D.; Gore, Shyam K.; Shaikh, Shoyebmohamad F.; Ekar, Satish U.; Ubaidullah, Mohd; Pak, James J.; Mane, Rajaram S.
- Issue Date
- 15-2월-2022
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- alpha-Fe2O3-graphene oxide; Structural analysis; Magnetic properties; NH3 sensor; p-n heterojunction
- Citation
- MATERIALS CHEMISTRY AND PHYSICS, v.278
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHEMISTRY AND PHYSICS
- Volume
- 278
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/141119
- DOI
- 10.1016/j.matchemphys.2021.125617
- ISSN
- 0254-0584
- Abstract
- Self-assembled alpha-Fe2O3-GO nanocomposites (NCs) obtained via rapid, easy and economic microwave-assisted method through the carbonization of sugar in presence of ferric nitrate in different concentrations are envisaged for physical, magnetic and ammonia (NH3) sensing measurements. The alpha-Fe2O3-GO NCs are composed of uniformly distributed spherical particles of similar to 20 nm in size. The effect of varying magnetic field on the surface and structure of the alpha-Fe2O3-GO NCs has also been investigated. Composites endow a better magnetization over the phase-pure. The highest gas response obtained for 100 ppm NH3 concentration at room-temperature (25 degrees C) for pristine GO is limited to 8%. Attributed to p-n hetero-junction effect and electron spill-over effect, on the alpha-Fe2O3 doping, the gas response is greatly improved to 80% at room-temperature. Mechanism for the enhanced sensitivity has carefully been addressed. Gas sensing activities of alpha-Fe2O3-GO NCs against various target gases are examined using computer assisted Keithley 6514 electro-source meter. Along with physical properties, magnetic and NH3 gas sensor performances of the alpha-Fe2O3-GO NCs are measured and reported in-depth.
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