MoS<sub>2</sub>-Templated Porous Hollow MoO<sub>3</sub> Microspheres for Highly Selective Ammonia Sensing via a Lewis Acid-Base Interaction

Meng, Fanli; Qi, Tianyao; Zhang, Junjie; Zhu, Hongmin; Yuan, Zhenyu; Liu, Congyue; Qin, Wenbo; Ding, Mengning

doi:10.1109/tie.2021.3053902

Cited by 105 publications

(39 citation statements)

References 66 publications

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“…Three-dimensional materials are favored by researchers because of their regular geometry, abundant pores and large specific surface area [47]. The core-shell structure, hierarchical structure and hollow structure are the main research hotspots at present.…”

Section: D Nanostructuresmentioning

confidence: 99%

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

2021

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Formaldehyde is a poisonous and harmful gas, which is ubiquitous in our daily life. Long-term exposure to formaldehyde harms human body functions; therefore, it is urgent to fabricate sensors for the real-time monitoring of formaldehyde concentrations. Metal oxide semiconductor (MOS) gas sensors is favored by researchers as a result of their low cost, simple operation and portability. In this paper, the mechanism of formaldehyde detection by gas sensors is introduced, and then the ways of ameliorating the response of gas sensors for formaldehyde detection in recent years are summarized. These methods include the control of the microstructure and morphology of sensing materials, the doping modification of matrix materials, the development of new semiconductor sensing materials, the outfield control strategy and the construction of the filter membrane. These five methods will provide a good prerequisite for the preparation of better performing formaldehyde gas sensors.

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Section: D Nanostructuresmentioning

confidence: 99%

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

2021

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“…Their semiconducting nature together with the large surface-to-volume ratio and most importantly room-temperature working conditions make them attractive for gas sensing applications. Indeed, 2D MoS 2 and MoSe 2 nanosheets have been used for the detection of various gases, for instance, H 2 S, NO, NO 2 , and NH 3 . ,− Yuan et al have shown a highly responsive MoS 2 nanosheet-based formic acid sensor . Previous results indicate that the sensing features of MoS 2 nanosheets are strongly influenced by ambient oxygen .…”

Section: Introductionmentioning

confidence: 99%

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS₂/SnO₂ Composite

et al. 2021

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Layered two-dimensional transition metal dichalcogenides, due to their semiconducting nature and large surface-to-volume ratio, have created their own niche in the field of gas sensing. Their large recovery time and accompanied incomplete recovery result in inferior sensing properties. Here, we report a composite-based strategy to overcome these issues. In this study, we report a facile double-step synthesis of a MoS 2 /SnO 2 composite and its successful use as a superior room-temperature ammonia sensor. Contrary to the pristine nanosheet-based sensors, the devices made using the composite display superior gas sensing characteristics with faster response. Specifically, at room temperature (30° C), the composite-based sensor exhibited excellent sensitivity (10%) at an ammonia concentration down to 0.4 ppm along with the response and recovery times of 2 and 10 s, respectively. Moreover, the device also exhibited long-term durability, reproducibility, and selectivity toward ammonia against hydrogen sulfide, methanol, ethanol, benzene, acetone, and formaldehyde. Sensor devices made on quartz and alumina substrates with different roughnesses have yielded almost an identical response, except for slight variations in response and recovery transients. Further, to shed light on the underlying adsorption energetics and selectivity, density functional theory simulations were employed. The improved response and enhanced selectivity of the composite were explicitly discussed in terms of adsorption energy. Lowdin charge analysis was performed to understand the charge transfer mechanism between NH 3 , H 2 S, CH 3 OH, HCHO, and the underlying MoS 2 /SnO 2 composite surface. The long-term durability of the sensor was evident from the stable response curves even after 2 months. These results indicate that hydrothermally synthesized MoS 2 /SnO 2 composite-based gas sensors can be used as a promising sensing material for monitoring ammonia gas in real fields.

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“…However, studies have shown that the prepared ZnO-sensing materials still have disadvantages such as high operating temperature and poor target gas selectivity [15][16][17], which hinder their practical application in the field of gas sensors. So, we searched for other metal oxides for compounding [18][19][20]. Semiconductor materials such as titanium dioxide (TiO 2 ) have a wide band gap of about 3.0 eV.…”

Section: Introductionmentioning

confidence: 99%

Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

Liao

Yuan

et al. 2021

Chemosensors

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In this paper, ZnO-TiO2-rGO nanocomposites were successfully synthesized by the hydrothermal method. The morphology and structure of the synthesized nanomaterials were characterized by SEM, XRD, HRTEM, and XPS. Butanone is a typical ketone product. The vapors are extremely harmful once exposed, triggering skin irritation in mild cases and affecting our breathing in severe cases. In this paper, the gas-sensing properties of TiO2, ZnO, ZnO-TiO2, and ZnO-TiO2-rGO nanomaterials to butanone vapor were studied. The optimum operating temperature of the ZnO-TiO2-rGO sensor is 145 °C, which is substantially lower than the other three sensors. The selectivity for butanone vapor is greatly improved, and the response is 5.6 times higher than that of other organic gases. The lower detection limit to butanone can reach 63 ppb. Therefore, the ZnO-TiO2-rGO sensor demonstrates excellent gas-sensing performance to butanone. Meanwhile, the gas-sensing mechanism of the ZnO-TiO2-rGO sensor to butanone vapor was also analyzed.

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MoS₂-Templated Porous Hollow MoO₃ Microspheres for Highly Selective Ammonia Sensing via a Lewis Acid-Base Interaction

Cited by 105 publications

References 66 publications

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS₂/SnO₂ Composite

Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

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MoS2-Templated Porous Hollow MoO3 Microspheres for Highly Selective Ammonia Sensing via a Lewis Acid-Base Interaction

Cited by 105 publications

References 66 publications

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS2/SnO2 Composite

Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

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MoS₂-Templated Porous Hollow MoO₃ Microspheres for Highly Selective Ammonia Sensing via a Lewis Acid-Base Interaction

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS₂/SnO₂ Composite