Ultra-sensitive ethanol gas sensors based on nanosheet-assembled hierarchical ZnO-In2O3 heterostructures

Zhang, Kun; Qin, Shuaiwei; Tang, Pinggui; Feng, Yongjun; Li, Dianqing

doi:10.1016/j.jhazmat.2020.122191

Cited by 193 publications

(69 citation statements)

References 49 publications

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“…The excellent sensing performance was ascribed to the synergistic effects between ZnO nanosheets and GO, which included a unique 2D structure, large specific surface area, suitable particle size, and abundant in-plane mesopores [114]. A ZnO/In 2 O 3 heterostructure-based sensor for ethanol gas at 240°C has been reported [115]. The sensor was found to exhibit a response as high as 170 toward 50 ppm of ethanol, which is about 3.3 times higher than that of pure In 2 O 3 -based sensor as well as excellent selectivity, good longterm stability, and moderate response and recovery speed (35/46 s) toward ethanol [115].…”

Section: Metal Oxide Nanostructures In Sensorsmentioning

confidence: 99%

“…A ZnO/In 2 O 3 heterostructure-based sensor for ethanol gas at 240°C has been reported [115]. The sensor was found to exhibit a response as high as 170 toward 50 ppm of ethanol, which is about 3.3 times higher than that of pure In 2 O 3 -based sensor as well as excellent selectivity, good longterm stability, and moderate response and recovery speed (35/46 s) toward ethanol [115]. Tungsten trioxide (WO 3 ), the second most commonly used semiconducting metal oxide in gas sensors, has been reported to show high sensor responses to several biomarkers found in breath, e.g., acetone, ammonia, carbon monoxide, hydrogen sulfide, toluene, and nitric oxide since the modern material science allows WO₃ samples to be tailored to address certain sensing needs [111].…”

Section: Metal Oxide Nanostructures In Sensorsmentioning

confidence: 99%

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Design and Synthesis of Nanostructured Materials for Sensor Applications

Noah

2020

Journal of Nanomaterials

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There has been an increasing demand for the development of sensor devices with improved characteristics such as sensitivity, low cost, faster response, reliability, rapider recovery, reduced size, in situ analysis, and simple operation. Nanostructured materials have shown great potential in improving these properties for chemical and biological sensors. There are different nanostructured materials which have been used in manufacturing nanosensors which include nanoscale wires (capability of high detection sensitivity), carbon nanotubes (very high surface area and high electron conductivity), thin films, metal and metal oxide nanoparticles, polymer, and biomaterials. This review provides different methods which have been used in the synthesis and fabrication of these nanostructured materials followed by an extensive review of the recent developments of metal, metal oxides, carbon nanotubes, and polymer nanostructured materials in sensor applications.

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Section: Metal Oxide Nanostructures In Sensorsmentioning

confidence: 99%

Section: Metal Oxide Nanostructures In Sensorsmentioning

confidence: 99%

Design and Synthesis of Nanostructured Materials for Sensor Applications

Noah

2020

Journal of Nanomaterials

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“…C 2 H 5 OH, as a flammable volatile organic compound, is widely used in the food and beverage industry, medical industry and chemical industry [ 1 ]. When the air contains high concentrations of ethanol, it will cause safety accidents such as explosions [ 2 ], and cause health problems such as neurasthenia [ 3 ]. Although great progress has been made in the detection of ethanol, the present detection approaches still have shortcomings such as high operating temperature, low sensitivity and limited selectivity.…”

Section: Introductionmentioning

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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“…In recent years, gas sensors have been widely used in industrial production and people’s daily lives [ 1 , 2 , 3 ]. Due to people’s increasing awareness of their safety and environmental protection, researchers and developers pay increasingly more attention to the development of gas sensors.…”

Section: Introductionmentioning

confidence: 99%

A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding

Pan

Liu

2020

Materials

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To meet the application requirements of a thermal gas sensor, it is necessary to realize a bond connection between PtW8 wire with a Au thick film. However, the physical properties, such as the melting point and hardness, of the two materials differ greatly. In this study, the parallel-gap resistance microwelding was introduced into the bonding connection between PtW8 wire and a Au thick film in the thermal gas sensor. The feasibility of the method was analyzed theoretically and the experimental system was established and studied. A scanning electron microscope (SEM) was used to analyze the morphology of the cross-section of the welded joint. The results showed that there was no obvious transition layer at the interface region but there were relatively dense welds. At the same time, it was found that the melted Au wetted and climbed on the surface of the platinum-tungsten alloy, which may have been the key to forming the joint. Elements were observed to have a spatial distribution gradient within the cross-section of the welding line, revealing that mutual diffusion occurred in the parallel-gap resistance microwelding, where this diffusion behavior may be the basic condition for forming the joint. Finally, the influence of the welding voltage, time, and force on the joint strength was also studied, where the joint strength could be up to 5 cN.

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Ultra-sensitive ethanol gas sensors based on nanosheet-assembled hierarchical ZnO-In2O3 heterostructures

Cited by 193 publications

References 49 publications

Design and Synthesis of Nanostructured Materials for Sensor Applications

Design and Synthesis of Nanostructured Materials for Sensor Applications

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

A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding

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