Cubic shaped hematite (α-Fe2O3) micro-structures composed of stacked nanosheets for rapid ethanol sensor application

Umar, Ahmad; Ibrahim, Ahmed A.; Kumar, Rajesh; Albargi, Hasan B.; Alsaiari, Mabkhoot; Ahmed, Faheem

doi:10.1016/j.snb.2020.128851

Cited by 55 publications

(23 citation statements)

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“…Şekil 1, sentezlenmiş katkısız ve Ni katkılı α-Fe2O3 yapılarının XRD kırınım desenlerini göstermektedir. Gözlenen kırınım deseni, Fe2O3 hematitin trigonal fazının tüm kırınım piklerine karşılık gelir (JCPDS PDF no: 33-0664) [11,35]. Mevcut tüm pikler sırasıyla (012), (104), (110), (113), (024), (116), (018), (214) ve (300) kristal düzlemlerine karşılık gelmektedir [36,37].…”

Section: Bulgular Ve Tartışmaunclassified

“…Yalnız en yüksek Ni içeriğine sahip olan 4Ni-Fe2O3 numunesinde düşük miktarda da olsa kübik kristal yapıya sahip NiO (JCPDS PDF no: 78-0429) ikincil fazının oluşumu tespit edilmiştir. XRD spektrumundaki dar ve keskin pikler, α-Fe2O3 yapılarının yüksek kristalleşmesini doğrular ve katkılı numunelerde kristalleşmenin arttığı görülmektedir [11]. Pik şiddetlerinde değişim ve piklerin konumlarında gözlemlenen kaymalar, Ni atomlarının hematit yapı içerisine nüfuz ettiği şeklinde yorumlanabilir.…”

Section: Bulgular Ve Tartışmaunclassified

“…Kullanım alanları arasında manyetik katalitik [9], gaz sensörleri [6][7][8][9]11], heterojen katalizörler için fotoelektrot [6][7][8], fotokatalizörler [8,12], Li-iyon pil elektrotları [8,13], pigmentler [7,14], güneş enerjisi dönüşümü [6], biyomedikal [9,15] ve diğer alanlardaki geniş uygulamalarından dolayı avantajlıdır.…”

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Investigation of The Effects of Ni-Doping on The Structural Properties of Fe2O3

Ateş

Köytepe

Bulut

et al. 2021

International Journal of Innovative Engineering Applications

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Original scientific paperIn the present study, the effects of Ni-doping on the structural properties of Fe2O3 samples prepared by a wet chemical method were investigated by using X-ray diffraction (XRD), Fourier transform infrared (FTIR), differential thermal analysis (DTA), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) techniques. XRD and FTIR results supported the formation of the Fe2O3 structure for each sample. Until 4at.%Ni-doping, no new phase formation was observed, and for this sample, the formation of the secondary phase of NiO was detected. It is seen that the crystal structure-related parameters and morphology are affected by Ni content. Briefly, Ni may be used to control some properties of the Fe2O3 structure.

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Section: Bulgular Ve Tartışmaunclassified

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Investigation of The Effects of Ni-Doping on The Structural Properties of Fe2O3

Ateş

Köytepe

Bulut

et al. 2021

International Journal of Innovative Engineering Applications

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“…Metal oxide semiconductor (MOS)-based resistive sensors have recently attracted a lot of interest because of their ease of manufacture and inexpensive cost, as well as their quick, programmable, sensitive, and selective response [27][28][29][30][31][32][33]. The performance of MOSbased sensors can be improved by using semiconductor metal oxide nanomaterials as sensing material because the nanomaterials have a higher specific surface area, which increases the interaction between the sensing material and the target gas and, thus, improves the sensing response [1,2,4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The performance of MOSbased sensors can be improved by using semiconductor metal oxide nanomaterials as sensing material because the nanomaterials have a higher specific surface area, which increases the interaction between the sensing material and the target gas and, thus, improves the sensing response [1,2,4,5]. Metal oxide nanomaterials such as zinc oxide (ZnO), copper oxide (CuO), tin oxide (SnO2), tungsten oxide (WO3), nickel oxide (NiO), cobalt oxide (Co3O4), iron oxide (Fe2O3), titanium oxide (TiO2), indium oxide (In2O3), vanadium oxide (V2O5), molybdenum oxide (MoO3), and others are used to fabricate efficient MOS sensors [28][29][30][31][32][33][34][35][36][37]. To explore the characteristics of both, n-and p-type semiconductor nanomaterials, MOS sensors have recently been made using p-n heterojunction nanostructures, which employ composites of p-and n-type semiconductors as functional materials to improve sensing characteristics.…”

Section: Introductionmentioning

confidence: 99%

p-CuO/n-ZnO Heterojunction Structure for the Selective Detection of Hydrogen Sulphide and Sulphur Dioxide Gases: A Theoretical Approach

et al. 2021

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DFT calculations at the B3LYP/LanL2DZ level of theory were utilized to investigate the adsorption of H2S and SO2 gases on the electronic properties of CuO-ZnO heterojunction structures. The results were demonstrated from the standpoint of adsorption energies (Eads), the density of states (DOS), and NBO atomic charges. The obtained values of the adsorption energies indicated the chemisorption of the investigated gases on CuO-ZnO heterojunction. The adsorption of H2S and SO2 gases reduced the HOMO-LUMO gap in the Cu2Zn10O12 cluster by 4.98% and 43.02%, respectively. This reveals that the Cu2Zn10O12 cluster is more sensitive to the H2S gas than the SO2 gas. The Eads values for SO2 and H2S were −2.64 and −1.58 eV, respectively. Therefore, the Cu2Zn10O12 cluster exhibits a higher and faster response-recovery time to H2S than SO2. Accordingly, our results revealed that CuO-ZnO heterojunction structures are promising candidates for H2S- and SO2-sensing applications.

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Exposure Surface Active Sites of Perovskite‐Type LaFeO₃ Gas Sensors by Selectively Dissolving La Cations for Enhancing Gas Sensing Properties to Acetone

Qin

Zhang

Yuan

et al. 2022

Adv Materials Technologies

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While perovskite metal oxide semiconductors (MOS) gas sensors have great potential for detecting various hazardous gases, the surface enrichment of inactive A‐sites severely limits their ability to obtain excellent gas sensing properties. Herein, one simple and facile citric acid etching method is reported with the aim of significantly improving the acetone sensing properties of perovskite LaFeO3 (LFO) by surface structure optimization. Structural characterization shows that citric acid selectively solubilized the A‐site cations and inhibits the occurrence of La segregation on the surface without destroying the perovskite structure, thus increasing the exposure of the active site Fe. At the operating temperature of 200 °C, the response of etched LFO for 20 ppm acetone reaches 50, which is almost 12 times higher than that of pristine LFO sample. Meanwhile, the etched LFO samples also exhibit low detection limits (50 ppb), good selectivity, and stability. The enhanced gas sensitivity is attributed to near‐perfect surface metal ion ratio (La/Fe atomic ratio = 0.97) and abundant oxygen species concentration. This work provides an avenue to enhance the acetone sensing properties and beyond by intentional structural modification, which not only has great scientific meaning, but also valuable potential for industrial and domestic applications.

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Cubic shaped hematite (α-Fe2O3) micro-structures composed of stacked nanosheets for rapid ethanol sensor application

Cited by 55 publications

References 85 publications

Investigation of The Effects of Ni-Doping on The Structural Properties of Fe2O3

Investigation of The Effects of Ni-Doping on The Structural Properties of Fe2O3

p-CuO/n-ZnO Heterojunction Structure for the Selective Detection of Hydrogen Sulphide and Sulphur Dioxide Gases: A Theoretical Approach

Exposure Surface Active Sites of Perovskite‐Type LaFeO₃ Gas Sensors by Selectively Dissolving La Cations for Enhancing Gas Sensing Properties to Acetone

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Cubic shaped hematite (α-Fe2O3) micro-structures composed of stacked nanosheets for rapid ethanol sensor application

Cited by 55 publications

References 85 publications

Investigation of The Effects of Ni-Doping on The Structural Properties of Fe2O3

Investigation of The Effects of Ni-Doping on The Structural Properties of Fe2O3

p-CuO/n-ZnO Heterojunction Structure for the Selective Detection of Hydrogen Sulphide and Sulphur Dioxide Gases: A Theoretical Approach

Exposure Surface Active Sites of Perovskite‐Type LaFeO3 Gas Sensors by Selectively Dissolving La Cations for Enhancing Gas Sensing Properties to Acetone

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Exposure Surface Active Sites of Perovskite‐Type LaFeO₃ Gas Sensors by Selectively Dissolving La Cations for Enhancing Gas Sensing Properties to Acetone