Strain-regulated sensing properties of α-Fe2O3 nano-cylinders with atomic carbon layers for ethanol detection

Xiong, Hao; Fu, Jianan; Li, Jinyao; Ali, Rashad; Wang, Hong; Liu, Yifan; Su, Hua; Li, Yuanxun; Lau, Woon‐Ming; Mahmood, Nasir; Mu, Chunlai; Jian, Xian

doi:10.1016/j.jmst.2020.08.009

Cited by 16 publications

(4 citation statements)

References 62 publications

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“…The gas response of a semiconductor sensor usually depends on the operating temperature of the sensor, which determines the surface state, gas adsorption/desorption and chemical reactions on the surface [ 3 , 35 ]. In a proper range, the increase in the working temperature is beneficial for the adsorption of oxygen and target gas on the surface of the materials.…”

Section: Resultsmentioning

confidence: 99%

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

Kang

Zhang

Wang

et al. 2021

Sensors

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It is of great significance to develop ethanol sensors with high sensitivity and low detection temperature. Hence, we prepared Au-supported material on mesoporous ZnO composites derived from a metal-organic framework ZIF-8 for the detection of ethanol gas. The obtained Au/ZnO materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (SEM), field emission transmission electron microscopy (TEM) and nitrogen adsorption and desorption isotherms. The results showed that the Au/ZnO-1.0 sample maintains a three-dimensional (3D) dodecahedron structure with a larger specific surface area (22.79 m2 g−1) and has more oxygen vacancies. Because of the unique ZIF structure, abundant surface defects and the formation of Au-ZnO Schottky junctions, an Au/ZnO-1.0 sensor has a response factor of 37.74 for 100 ppm ethanol at 250 °C, which is about 6 times that of pure ZnO material. In addition, the Au/ZnO-1.0 sensor has good selectivity for ethanol. According to density functional theory (DFT) calculations, the adsorption energy of Au/ZnO for ethanol (−1.813 eV) is significantly greater than that of pure ZnO (−0.217 eV). Furthermore, the adsorption energy for ethanol is greater than that of other gases.

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Section: Resultsmentioning

confidence: 99%

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

Kang

Zhang

Wang

et al. 2021

Sensors

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“…In this study, the structural, optical, and topographic properties of Al x Fe 2−x O 3 structures grown by RF-DC co-sputtering were investigated by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), Raman Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and UV-VIS photo spectroscopy [11][12][13][14]. In addition, in this study, the response of Al x Fe 2−x O 3 to hydrogen gas was measured at flow values of 1000 ppm at 300 degrees and for 300, 180, 120 s, respectively.…”

Section: Introductionmentioning

confidence: 99%

Photosensitive iron–aluminum oxide gas sensor

Turgut

2024

J Mater Sci: Mater Electron

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In this study, the structural, topographic, and optical properties of iron–aluminum oxide (AlxFe2−xO3, 1 > x > 0) thin film grown by co-sputtering method were investigated. Firstly, AlxFe2−xO3 films grown by magnetron RF–DC co-sputtering method were annealed at 540 °C and then XRD analyses were performed. The absorption measurement, Raman shift, XPS, gas sensor measurements, and SEM images were taken, respectively. The band gap energy of the AlxFe2−xO3 samples was obtained and measured as approximately 2.41 eV, and different peaks at various intensities were seen in the XRD analysis. According to the XRD analysis of the AlxFe2−xO3 semiconductor, the peaks occurred at 33.42°, 41.16°, and 54.43° and the XRD analysis results show that the structure is polycrystalline. As seen in the measurement of the AlxFe2−xO3 gas sensors, acoustic gas sensorsgas sensor, the current value increased with the flow of hydrogen gas. This means that the oxygen that hydrogen detached from the thin film surface contributes to the conductivity of the remaining electrons in the structure, which means that the thin film was an n-type semiconductor. It was seen that the AlxFe2−xO3 gas sensor was very sensitive to light. During the feature measurement, it was seen that the current value measured under the light increases considerably.

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“…Metal oxide-based gas sensors (MOX) are among the foremost versatile type of sensors, being capable of detecting a wide variety of gases under in-field operating conditions [1][2][3][4]. The operating principle of MOX gas sensors relies on the electrical resistance changes with respect to the gas-surface interaction processes.…”

Section: Introductionmentioning

confidence: 99%

Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity

et al. 2021

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Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron affinity. The experimental results have shown that the presence of moisture induces an unusual behavior toward carbon monoxide (CO) detection by considering different surface adsorption sites. On this basis, we derived an appropriate detection mechanism capable of explaining the lack of moisture influence over the CO detection with NiO-sensitive materials. As such, CO might have both chemical and dipolar interactions with pre-adsorbed or lattice oxygen species, thus canceling out the effect of moisture. Additionally, morphology, structure, and surface chemistry were addressed, and the results have been linked to the sensing properties envisaging the role played by the porous quasispherical–hollow structures and surface hydration.

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Strain-regulated sensing properties of α-Fe2O3 nano-cylinders with atomic carbon layers for ethanol detection

Cited by 16 publications

References 62 publications

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

Photosensitive iron–aluminum oxide gas sensor

Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity

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