Metal-organic frameworks derived ZnO@MoS nanosheets core/shell heterojunctions for ppb-level acetone detection: Ultra-fast response and recovery

Chi, Xiao; Li, Xiaofang; Qiao, Xurong; Li, Kun; Xiong, Ya; Li, Xiao; Guo, Tianchao; Zhu, Lei; Xue, Qingzhong

doi:10.1016/j.snb.2019.127430

Cited by 63 publications

(34 citation statements)

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“…The composition of C-S nanostructure materials can be roughly divided into the following categories: noble metal/noble metal [ 85 , 88 ], metal oxide/metal oxide [ 31 , 89 , 90 , 91 ], metal oxide/metal sulfide [ 92 , 93 ], and metal oxide/noble metal (including core shell exchange) [ 94 , 95 ]. Next, we introduce some typical examples.…”

Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

“…The sensor’s ultimate resistance (Rg) will increase. According to Chang et al [ 92 ], the response is described by Equation (3). Response = (Rg − Ra)/Ra × 100% …”

Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

“…C-S nanostructures have been researched to detect inorganic gas and VOCs (Table 3). To further introduce the application of C-S nanostructures, we will summarize the research progress of C-S nanostructure gas sensors of three types: metal oxide/metal oxide [31,89], metal oxide/metal sulfide [92,93], and metal oxide/noble metal [94,107]. Besides, n-n heterostructure and p-p heterostructure have also been produced with C-S nanostructures.…”

Section: The Application Of C-s Nanostructuresmentioning

confidence: 99%

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Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

et al. 2021

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In order to solve issues of air pollution, to monitor human health, and to promote agricultural production, gas sensors have been used widely. Metal oxide semiconductor (MOS) gas sensors have become an important area of research in the field of gas sensing due to their high sensitivity, quick response time, and short recovery time for NO2, CO2, acetone, etc. In our article, we mainly focus on the gas-sensing properties of MOS gas sensors and summarize the methods that are based on the interface effect of MOS materials and micro–nanostructures to improve their performance. These methods include noble metal modification, doping, and core-shell (C-S) nanostructure. Moreover, we also describe the mechanism of these methods to analyze the advantages and disadvantages of energy barrier modulation and electron transfer for gas adsorption. Finally, we put forward a variety of research ideas based on the above methods to improve the gas-sensing properties. Some perspectives for the development of MOS gas sensors are also discussed.

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Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

“…The sensor’s ultimate resistance (Rg) will increase. According to Chang et al [ 92 ], the response is described by Equation (3). Response = (Rg − Ra)/Ra × 100% …”

Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

Section: The Application Of C-s Nanostructuresmentioning

confidence: 99%

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Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

et al. 2021

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“…In recent years, researchers have prepared a large number of MOS gas sensors around ethanol gas including ZnO gas sensors [ 24 ], Fe 2 O 3 gas sensors [ 25 ], In 2 O 3 gas sensors [ 26 ], SnO 2 gas sensors [ 27 ], and so on. However, a traditional single MOS gas sensor has certain limitations such as high detection threshold, poor selectivity, low response value, high operating temperature, etc., which limit the application of a MOS gas sensor in a real environment [ 28 , 29 ]. Therefore, a variety of research schemes for improving MOS gas sensors have been proposed including noble metal modification [ 30 ], construction of heterojunction [ 31 ], optimizing microstructure [ 32 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Sensors Based on Porous In2O3 Nanosheet-Assembled Micro-Flowers

Qin

Yuan

Gao

et al. 2020

Sensors

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By controlling the hydrothermal time, porous In2O3 nanosheet-assembled micro-flowers were successfully synthesized by a one-step method. The crystal structure, microstructure, and internal structure of the prepared samples were represented by an x-ray structure diffractometry, scanning electron microscopy, and transmission electron microscopy, respectively. The characterization results showed that when the hydrothermal time was 8 h, the In2O3 nano materials presented a flower-like structure assembled by In2O3 porous nanosheets. After successfully preparing the In2O3 gas sensor, the gas sensing was fully studied. The results show that the In2O3 gas sensor had an excellent gas sensing response to ethanol, and the material prepared under 8 h hydrothermal conditions had the best gas sensing property. At the optimum working temperature of 270 °C, the highest response value could reach 66, with a response time of 12.4 s and recovery time of 10.4 s, respectively. In addition, the prepared In2O3 gas sensor had a wide detection range for ethanol concentration, and still had obvious response for 500 ppb ethanol. Furthermore, the gas sensing mechanism of In2O3 micro-flowers was also studied in detail.

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“…Meanwhile, as a potential biomarker, measurement of the low acetone concentration in human breath is a good indicator of diabetes for non-invasive diagnosis. Based on reported data, the average exhaled acetone concentration for ordinary people is about 0.3-0.9 ppm, which obviously lower than that of the diabetic patients (>1.8 ppm) [5], [6]. Hence, it is urgent and important to accelerate the development of acetone sensors with excellent sensing properties for indoor air detection and health monitoring applications.…”

mentioning

confidence: 99%

Electrospinning Encapsulation of Pd Nanoparticles into α-Fe₂O₃ Nanofibers Windows Enhanced Acetone Sensing

et al. 2021

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Different concentrations (0, 1 mol%, 2 mol%, 6 mol% and 8 mol%) of palladium (Pd) nanoparticles modified hematite nanofibers (Pd NPs@α-Fe 2 O 3 NFs) were successfully synthesized via a facile electrospinning method followed by the calcination treatment. Their surface morphologies, crystal structures and chemical compositions were subsequently characterized in order to find optimum modification percentage. The gas sensing experiments on Pd NPs@α-Fe 2 O 3 -based gas sensors revealed that encapsulation of Pd NPs into α-Fe 2 O 3 NFs could significantly improve their sensing performances. Specifically, the as-prepared Pd 4 /Fe gas sensor exhibited higher response (R air /R gas = 16.6) toward 100 ppm acetone at 220 • C, which was 3.4 times higher than that of Pd 0 /Fe sensor (4.89). Meanwhile, the Pd 4 /Fe sensor also showed shorter response/recovery (4 s/4 s), low limit of detection (LOD) (50 ppb) and good selectivity and long-term stability. The enhanced gas sensing properties of Pd NPs@α-Fe 2 O 3 -based gas sensors could be attributed to the chemical and electronic sensitization of Pd NPs. Index Terms-Electrospinning, gas sensor, α-Fe 2 O 3 nanofibers, Pd nanoparticles, acetone detection. I. INTRODUCTIONA CETONE, as one of the most important chemical reagents, has been extensively used in various industrial manufacturing processes producing, pharmaceuticals and household products, cosmetics and personal care products [1], [2]. While, on the other hand, because of the extreme volatility and deleterious characteristics, acetone has become one of the major indoor air pollution gases among

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Metal-organic frameworks derived ZnO@MoS nanosheets core/shell heterojunctions for ppb-level acetone detection: Ultra-fast response and recovery

Cited by 63 publications

References 58 publications

Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

Ethanol Sensors Based on Porous In2O3 Nanosheet-Assembled Micro-Flowers

Electrospinning Encapsulation of Pd Nanoparticles into α-Fe₂O₃ Nanofibers Windows Enhanced Acetone Sensing

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Metal-organic frameworks derived ZnO@MoS nanosheets core/shell heterojunctions for ppb-level acetone detection: Ultra-fast response and recovery

Cited by 63 publications

References 58 publications

Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

Ethanol Sensors Based on Porous In2O3 Nanosheet-Assembled Micro-Flowers

Electrospinning Encapsulation of Pd Nanoparticles into α-Fe2O3 Nanofibers Windows Enhanced Acetone Sensing

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Product

Resources

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Electrospinning Encapsulation of Pd Nanoparticles into α-Fe₂O₃ Nanofibers Windows Enhanced Acetone Sensing