Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films

Nikolić, Maria Vesna; Vasiljević, Zorka Ž.; Luković, Miloljub D.; Pavlović, Vera P.; Vujančević, Jelena; Radovanović, Milan; Krstić, Jugoslav; Vlahović, Branislav; Pavlović, Vladimir B.

doi:10.1016/j.snb.2018.09.063

Cited by 40 publications

(43 citation statements)

References 42 publications

(65 reference statements)

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“…One dielectric relaxation process was noted for complex impedance. This has been noted before for metal oxide semiconductors, including nickel manganite [ 20 , 28 , 55 , 56 ]. Highly conducting grains and the resistive nature of grain boundaries present in nickel manganite contribute to this relaxation process [ 57 ].…”

Section: Resultssupporting

confidence: 61%

“…The measured complex impedance spectra (as shown in Figure 6 b at the working temperature of 25 °C) were analyzed using an equivalent circuit consisting of a parallel resistance and constant phase element (CPE), as it was not possible to separate the influence of grain and grain boundary components of the measured impedance, as shown in the inset in Figure 6 b. The CPE element was used, as we expected non-ideal Debye capacitance behavior previously noted for NiMn 2 O 4 synthesized by refluxing nickel oleate and manganese oleate [ 28 ], and other metal oxides, such as FeMnO 3 [ 55 ] or Fe 2 TiO 5 [ 56 ]. Fitting of experimental data to the proposed equivalent circuit was performed using the EIS Spectrum Analyzer Software [ 62 ].…”

Section: Resultsmentioning

confidence: 99%

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Electrospun Nickel Manganite (NiMn2O4) Nanocrystalline Fibers for Humidity and Temperature Sensing

Dojčinović

Vasiljević

Krstić

et al. 2021

Sensors

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Nickel manganite nanocrystalline fibers were obtained by electrospinning and subsequent calcination at 400 °C. As-spun fibers were characterized by TG/DTA, Scanning Electron Microscopy and FT-IR spectroscopy analysis. X-ray diffraction and FT-IR spectroscopy analysis confirmed the formation of nickel manganite with a cubic spinel structure, while N2 physisorption at 77 K enabled determination of the BET specific surface area as 25.3 m2/g and (BJH) mesopore volume as 21.5 m2/g. The material constant (B) of the nanocrystalline nickel manganite fibers applied by drop-casting on test interdigitated electrodes on alumina substrate, dried at room temperature, was determined as 4379 K in the 20–50 °C temperature range and a temperature sensitivity of −4.95%/K at room temperature (25 °C). The change of impedance with relative humidity was monitored at 25 and 50 °C for a relative humidity (RH) change of 40 to 90% in the 42 Hzπ1 MHz frequency range. At 100 Hz and 25 °C, the sensitivity of 327.36 ± 80.12 kΩ/%RH was determined, showing that nickel manganite obtained by electrospinning has potential as a multifunctional material for combined humidity and temperature sensing.

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Electrospun Nickel Manganite (NiMn2O4) Nanocrystalline Fibers for Humidity and Temperature Sensing

Dojčinović

Vasiljević

Krstić

et al. 2021

Sensors

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“…Pseudobrookite was refined assuming the Cmcm (

) space group starting with a random distribution of TiO 6 and FeO 6 octahedra, where 67% iron ions are both in 4c and 8f sites of the FeO 6 octahedra [ 19 ]. As starting unit cell parameters, we used the values previously determined for Fe 2 TiO 5 nanocrystalline powder obtained by solid-state synthesis [ 20 ]. All diffraction peaks can be indexed to the orthorhombic phase of Fe 2 TiO 5 with space group

( Cmcm ) without any peaks originating from impurities.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method

et al. 2020

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The aim of this work was to synthesize semiconducting oxide nanoparticles using a simple method with low production cost to be applied in natural sunlight for photocatalytic degradation of pollutants in waste water. Iron titanate (Fe 2 TiO 5 ) nanoparticles with an orthorhombic structure were successfully synthesized using a modified sol–gel method and calcination at 750°C. The as-prepared Fe 2 TiO 5 nanoparticles exhibited a moderate specific surface area. The mesoporous Fe 2 TiO 5 nanoparticles possessed strong absorption in the visible-light region and the band gap was estimated to be around 2.16 eV. The photocatalytic activity was evaluated by the degradation of methylene blue under natural sunlight. The effect of parameters such as the amount of catalyst, initial concentration of the dye and pH of the dye solution on the removal efficiency of methylene blue was investigated. Fe 2 TiO 5 showed high degradation efficiency in a strong alkaline medium that can be the result of the facilitated formation of OH radicals due to an increased concentration of hydroxyl ions.

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“…Simple techniques such as solid-state synthesis or high-energy ball milling are still applied for synthesis of metal oxides for gas sensing [ 59 , 60 ]. Solution-based synthesis methods such as hydrothermal and solvothermal synthesis [ 37 , 39 , 45 ], sol-gel synthesis [ 41 , 61 , 62 ], or electrospinning [ 63 ] are the subject of much research as they can create a diverse spectrum of nanostructures and heterostructures [ 64 ].…”

Section: Semiconductor Sensing Materialsmentioning

confidence: 99%

Semiconductor Gas Sensors: Materials, Technology, Design, and Application

Nikolić

Milovanović

Vasiljević

et al. 2020

Sensors

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308

134

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This paper presents an overview of semiconductor materials used in gas sensors, their technology, design, and application. Semiconductor materials include metal oxides, conducting polymers, carbon nanotubes, and 2D materials. Metal oxides are most often the first choice due to their ease of fabrication, low cost, high sensitivity, and stability. Some of their disadvantages are low selectivity and high operating temperature. Conducting polymers have the advantage of a low operating temperature and can detect many organic vapors. They are flexible but affected by humidity. Carbon nanotubes are chemically and mechanically stable and are sensitive towards NO and NH3, but need dopants or modifications to sense other gases. Graphene, transition metal chalcogenides, boron nitride, transition metal carbides/nitrides, metal organic frameworks, and metal oxide nanosheets as 2D materials represent gas-sensing materials of the future, especially in medical devices, such as breath sensing. This overview covers the most used semiconducting materials in gas sensing, their synthesis methods and morphology, especially oxide nanostructures, heterostructures, and 2D materials, as well as sensor technology and design, application in advance electronic circuits and systems, and research challenges from the perspective of emerging technologies.

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Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films

Abstract: Highlights Nanocrystalline pseudbrookite thick films  High humidity sensing  Fast response  Short time delay

Cited by 40 publications

References 42 publications

Electrospun Nickel Manganite (NiMn2O4) Nanocrystalline Fibers for Humidity and Temperature Sensing

Electrospun Nickel Manganite (NiMn2O4) Nanocrystalline Fibers for Humidity and Temperature Sensing

Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method

Semiconductor Gas Sensors: Materials, Technology, Design, and Application

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