Hydrogen Sensing of Heterostructured Magnetic Nanospheres With Different Fe to Zn Molar Ratio

This article describes the fabrication of Zinc Ferrite-Zinc oxide (ZFO-ZnO) heterostructure devices and the various sensing schemes that can be exploited using the same. A solvothermal approach has been used for the synthesis of ZFO-ZnO heterostructures having different compositions. The investigati...

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Bibliographic Details
Published inIEEE transactions on nanotechnology Vol. 20; pp. 669 - 677
Main Authors Daniel, Thomas T., Saikia, Koushik, Raveesh, S., Paily, Roy
Format Journal Article
LanguageEnglish
Published New York IEEE 2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Current voltage characteristics
Electric properties
heterojunctions
Heterostructures
hydrogen
II-VI semiconductor materials
Ion concentration
Iron
Magnetic properties
Magnetic semiconductors
magnetic sensors
Magnetic separation
Magnetic tunneling
magnetoresistance
Nanospheres
Nanotechnology
Room temperature
Sensors
Zinc
Zinc ferrites
Zinc oxide
Zinc oxides
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Summary:This article describes the fabrication of Zinc Ferrite-Zinc oxide (ZFO-ZnO) heterostructure devices and the various sensing schemes that can be exploited using the same. A solvothermal approach has been used for the synthesis of ZFO-ZnO heterostructures having different compositions. The investigation of magnetic and electric properties is performed by varying the ratio of Zn<inline-formula><tex-math notation="LaTeX">^{2+}</tex-math></inline-formula> and Fe<inline-formula><tex-math notation="LaTeX">^{3+}</tex-math></inline-formula> ions. These heterostructures show enhanced magnetization with (i) an increase in the concentration of Fe<inline-formula><tex-math notation="LaTeX">^{3+}</tex-math></inline-formula> ions and (ii) exposure to hydrogen (H<inline-formula><tex-math notation="LaTeX">_2</tex-math></inline-formula>) gas. These fine molar ratio adjustments in magnetism are engineered to obtain desirable sensing properties. We fabricated several two-terminal devices for the study of multiple sensing schemes. These devices demonstrated a linear current-voltage characteristic, with enhanced electrical resistance when the Fe<inline-formula><tex-math notation="LaTeX">^{3+}</tex-math></inline-formula> ion concentration is reduced. Keywords- Magnetic analysis, Zinc Ferrite-Zinc oxide, sensors, room temperature, heterostructures, tunability and nanotechnology
ISSN:1536-125X
1941-0085
DOI:10.1109/TNANO.2021.3108797