Synthesis of Maghemite nanoparticles for highly sensitive and selective NO2 sensing

Synthesis of Maghemite nanoparticles for highly sensitive and selective NO2 sensing

[Display omitted] •Maghemite nanoparticles are synthesized using coprecipitation method.•Annealing temperature played a vital role in the development of the Maghemite phase (γ) from magnetite (Fe3O4).•The fabricated Maghemite (a) sensor was found highly sensitive and selective even at 1 ppm of NO2 g...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Vol. 272; p. 115339
Main Authors: Patekari, Mangesh D., Pawar, Krishna K., Salunkhe, Gayatri B., Kodam, Pavan M., Padvi, Mukesh N., Waifalkar, P.P., Sharma, Kiran K., Patil, Pramod S.
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 01-10-2021
Elsevier BV
Subjects:
Ammonia
Annealing
Carbon dioxide
Chemical bonds
Ethanol
Ferric oxide
Fourier transforms
Gas sensors
Gases
Hematite
Infrared spectroscopy
Iron oxides
Maghemite
Magnetite
Morphology
Nanoparticles
Nitrogen dioxide
NO2 sensing
Operating temperature
Oxidation
Recovery time
Response time
Selective gas
Sensitive
Sensors
Synthesis
Nanoparticles
NO2 sensing
Sensitive
Selective gas
Maghemite
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Summary:[Display omitted] •Maghemite nanoparticles are synthesized using coprecipitation method.•Annealing temperature played a vital role in the development of the Maghemite phase (γ) from magnetite (Fe3O4).•The fabricated Maghemite (a) sensor was found highly sensitive and selective even at 1 ppm of NO2 gas.•Maghemite sensor shows a short response and recovery time at low concentration of NO2 gas.•This work emphasis the fabrication of highly sensitive and selective Maghemite based NO2 gas sensor. We report a simple and efficient method for the synthesis of highly sensitive and selective Maghemite (γ-Fe2O3) nanoparticles from magnetite (Fe3O4). Maghemite nanoparticles were obtained by optimizing the annealing temperature. The annealing temperature was found critical for obtaining Maghemite phase (γ) from magnetite. The structure, morphology, and chemical bonding of obtained Maghemite nanoparticles were annealed at 300 °C-600 °C temperature. These samples were characterized using X-ray diffraction (XRD), Scanning electron microscope (SEM), and Fourier-transform infrared spectroscopy (FT-IR), etc. The structural property of all the annealed samples revealed the formation of Maghemite (γ-Fe2O3) and hematite (α-Fe2O3) phases. Moreover, the sensing properties of all the samples were carried out for various oxidizing and reducing gases like acetone ((CH3)2CO), ammonia (NH3), ethanol (C2H6O), carbon dioxide (CO2), nitrogen dioxide (NO2). The fabricated cubic Maghemite sensor annealed at 300 °C-was found to be more sensitive and selective towards NO2 gas at 150 °C of operating temperature. Additional parameters like operating temperature, linearity, response time (SRes) and, recovery time (SRec) were also evaluated, which shows typical sensing behavior. These typical properties of fabricated Maghemite sensor were useful to study the behaviour of the gas sensor. Thus, the present effort depicts the exemplary sensing behaviour of Maghemite annealed at 300 °C nanoparticles over different phases of iron oxide nanoparticles. This work strongly recommends an efficient approach to fabricate Maghemite sensors with highly sensitive and selective towards NO2 gas detection than ever in the reported literature.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2021.115339