Fast nano-grained Fe&lt;inf&gt;3&lt;/inf&gt;O&lt;inf&gt;4&lt;/inf&gt; gas sensor for the control of CO and NO&lt;inf&gt;2&lt;/inf&gt; concentrations

Bertocci, Francesco; Fort, Ada; Mugnaini, Marco; Bertolucci, Elisa; Marracci, Mirko; Galletti, Anna Maria Raspolli; Tellini, Bernardo

doi:10.1109/metroaerospace.2016.7573228

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…This is because when the doping amount is less than 5%, it not only ensures the existence of a certain amount of oxygen vacancies but also slightly enhances the synergy between Co and Fe and improves the reduction performance. , When the Co content continues to increase, it will occupy more oxygen vacancies in the octahedron. Meanwhile, the rapid electron transfer between the neighboring ions of Fe 2+ /Co 2+ and Fe 3+ in the octahedron also increases the reduction temperature of Fe 2 O 3 → Fe 3 O 4 . What is more, in the range 470–520 °C, there is an enhanced peak with an increase of Co content, which is the cobalt reduction peak (Co 2+ → Co 0 ) .…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the rapid electron transfer between the neighboring ions of Fe 2+ /Co 2+ and Fe 3+ in the octahedron also increases the reduction temperature of Fe 2 O 3 → Fe 3 O 4 . 54 What is more, in the range 470−520 °C, there is an enhanced peak with an increase of Co content, which is the cobalt reduction peak (Co 2+ → Co 0 ). 55 These changes indicate that the 5Co−Fe catalyst has the best reduction ability and explain the reason why the 5Co−Fe exhibited optimal catalytic activity.…”

Section: Introductionmentioning

confidence: 97%

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Effect of Co Doping on Magnetic and CO-SCR Properties of γ-Fe₂O₃

Chen

Wei

et al. 2021

Ind. Eng. Chem. Res.

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Magnetic bayberry-like γ-xCoFe2O3 microspheres catalysts with different mole ratios (Co/Fe = 0, 1, 3, 5, 7, 9%) are synthesized by a solvothermal method followed by calcination. Then, a series of characterizations are carried out using Raman spectroscopy, X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), H2 temperature-programmed reduction (TPR), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Also, as the results indicate that with increasing Co doping amount, the microspheres shrink first and then expand, which obviously affect the specific surface area and activity; samples’ catalytic performance is improved by doping an appropriate amount of cobalt, and 5Co–Fe shows the optimum activity with the largest surface area. Moreover, in-situ DRIFTS result shows that the introduction of Co promotes the formation of decomposable monodentate nitrates rather than chelate bidentate nitrates and improve samples’ magnetic properties, which promote more NO adsorbed on catalyst surface to form chelate nitrate species, so that enhanced the activity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Effect of Co Doping on Magnetic and CO-SCR Properties of γ-Fe₂O₃

Chen

Wei

et al. 2021

Ind. Eng. Chem. Res.

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“…This transformation changes its conductivity and delivers it as a sensor signal. Their work reported the sensitivity of 14.43% to 500 ppb of NO with a response time of 10-20 s. N-type chemiresistive behavior of Fe 3 O 4 was observed by Bertocci et al 75 The prepared Fe 3 O 4 nanoparticles or nanograin with the average size of 16.3 nm success to detect CO and NO 2 at optimal operating temperatures of 260 °C and 220 °C respectively. As a half metal, the magnetite's conductivity is mainly contributed by minority spin channels where hopping electrons from Fe 2+ to Fe 3+ occurred and act as electron donors to oxygen ion sorption.…”

Section: Fe 3 O 4 As Sensitive Materials For Gas Sensorsmentioning

confidence: 86%

Review—A Pollutant Gas Sensor Based On Fe₃O₄ Nanostructures: A Review

Siregar

Septiani

Abrori

et al. 2021

J. Electrochem. Soc.

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Magnetite (Fe3O4) nanostructures and their modifications with other materials show proper characteristics to be implemented as a sensing material. This paper provides a brief review of the application of the Fe3O4 nanostructures and their modifications as sensitive material for pollutant gas sensors. Several studies were highlighted to explain the past-to-present progress of materials development. Various synthesis procedures of the materials were also clearly explained. The application of pure Fe3O4 nanostructures and their modification as sensitive materials in gas sensor devices to detect toxic gases is the main section of this paper. Last, the future prospects section summarized the materials’ development and provided a suggestion for future development.

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