Active edge effect of pothole-rich WO3 nanosheets for enhancing dimethyl trisulfide gas sensing performance

Hu, Xiafen; Li, Xiang; Yang, Huimin; Liu, Songhua; Qin, Ziyu; Xie, Changsheng; Zeng, Dawen

doi:10.1016/j.snb.2021.131103

Cited by 12 publications

(8 citation statements)

References 46 publications

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“…In addition, these numerous high-energy sites on the surfaces of metal oxide NFs and NSs can serve as centers for nucleation and adsorption of noble metals and other materials used to functionalize the surface and increase its catalytic activity [ 55 , 56 ]. Similar conclusions were made in [ 57 ] based on an analysis of the difference in gas-sensing performance between hole-rich WO 3 and non-porous WO 3 nanosheets. They explained the improved response of the sensor based on porous WO 3 nanosheets to C 2 H 6 S 3 by the participation of active-edge centers on hole-rich WO 3 nanosheets in the gas-sensing effect.…”

Section: Advantages Of Porous 2d Nanostructures For Application In Ga...supporting

confidence: 86%

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Tolstoy

2023

Nanomaterials

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This article discusses the features of the synthesis and application of porous two-dimensional nanomaterials in developing conductometric gas sensors based on metal oxides. It is concluded that using porous 2D nanomaterials and 3D structures based on them is a promising approach to improving the parameters of gas sensors, such as sensitivity and the rate of response. The limitations that may arise when using 2D structures in gas sensors intended for the sensor market are considered.

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Section: Advantages Of Porous 2d Nanostructures For Application In Ga...supporting

confidence: 86%

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Tolstoy

2023

Nanomaterials

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“…Performance of the D-WO 3 NS-based sensor: (a) response to 100 ppb of C 2 H 6 S 3 vs the operating temperature; (b) responses vs C 2 H 6 S 3 concentration at 260 °C of the D-WO 3 -2 NSs and initial WO 3 NSs; (c) response–recovery curve of D-WO 3 -2 NSs to different concentrations of C 2 H 6 S 3 at 260 °C; and (d) repeatability test curve to 100 ppb C 2 H 6 S 3 at 260 °C.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the porous WO 3 NSs that have not been treated with hydrogen in our previous work, D-WO 3 -2 NSs with abundant oxygen vacancies have significantly improved sensing performance for DMTS. 48 Taking 100 ppb DMTS gas as an example (Figure S4), the response value of D-WO 3 -2 NSs is 2.3 times that of initial WO 3 NSs. It is worth noting that D-WO 3 -2 NSs were obtained from the WO 3 NS after a simple hydrogen annealing treatment.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Active W Sites Promoted by Defect Engineering Enhanced C₂H₆S₃ Sensing Performance of WO₃ Nanosheets

Yang

et al. 2022

ACS Sens.

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Defect engineering has received extensive attention as an effective method to tune the gas sensing properties of semiconductor materials. Here, defective WO 3 (D-WO 3 ) nanosheets were obtained by a simple hydrogenation process with a detection limit as low as 5 ppb for dimethyl trisulfide (DMTS) and a response of 2.3 times that of the initial WO 3 nanosheets to 100 ppb DMTS. Importantly, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the partial loss of oxygen atoms in D-WO 3 nanosheets, and density functional theory calculations found that the W sites near the oxygen defect showed higher adsorption energy for DMTS and transferred more electrons during the gas interaction, indicating that the active W site caused by oxygen atom loss can effectively enhance the reactivity of twodimensional WO 3 nanosheets. Different from the traditional oxygen defect model, this work reveals the positive effect of active metal sites on gas sensing for the first time, which is expected to provide an effective reference for the sensing application of defect engineering in metal oxides.

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“…Hu et al prepared thin pothole-rich and thick non-porous WO 3 nanosheets, showing that the detection of C 2 H 6 S 3 gas at ppb levels was achieved by the pothole-rich WO 3 nanosheets, which was significantly better than the nonporous WO 3 nanosheets. 13 Zeb and co-workers synthesized WO 3 nanowire bundles by a hydrothermal method and modified bimetal Au−Pd nanoparticles on the surface of WO 3 nanowire bundles by an in situ method, which greatly improved the gas sensing performance of WO 3 nanowire bundles to n-butanol. 14 Wang et al fabricated a CuO/WO 3 hierarchical hollow microsphere sensor and achieved an ultrahigh response to H 2 S by constructing heterojunctions, whose response value is 1297 to 10 ppm H 2 S gas, about 103 times than that of pure WO 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Among these, the construction of heterojunctions to improve the gas sensing performance of sensors is considered as a simplified and effective strategy. Hu et al prepared thin pothole-rich and thick non-porous WO 3 nanosheets, showing that the detection of C 2 H 6 S 3 gas at ppb levels was achieved by the pothole-rich WO 3 nanosheets, which was significantly better than the non-porous WO 3 nanosheets . Zeb and co-workers synthesized WO 3 nanowire bundles by a hydrothermal method and modified bimetal Au–Pd nanoparticles on the surface of WO 3 nanowire bundles by an in situ method, which greatly improved the gas sensing performance of WO 3 nanowire bundles to n -butanol .…”

Section: Introductionmentioning

confidence: 99%

Heterojunctions of ZnO-Nanorod-Decorated WO₃ Nanosheets Coated with ZIF-71 for Humidity-Independent NO₂ Sensing

Qian,

Fang,

Gui

et al. 2023

ACS Appl. Nano Mater.

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NO2 is a very dangerous and toxic gas and is prone to cause acid rain in high humidity environments, so it is essential to prepare a real-time monitoring and humidity immunity NO2 sensor. WO3 nanomaterials are commonly applied to detect NO2, but their poor immunity to humidity is still a critical limitation for the application. ZnO-nanorod-decorated WO3 nanosheets coated with ZIF-71 (ZnO@ZIF-71/WO3) composites prepared by an in situ growth method displayed excellent gas sensing performance and good humidity immunity to detect NO2. Compared to WO3 nanosheets and ZnO-nanorod-decorated WO3 nanosheets (ZnO/WO3) heterojunction composites grown on ceramic substrates in situ, ZnO@ZIF-71/WO3 presented excellent selectivity, good long-term stability, and a remarkably high response of about 947.96 to 100 ppm NO2 at 180 °C, which is 3.07 times higher than that of the ZnO/WO3 sensor and 4.59 times higher than that of the pure WO3 sensor. Even at a relative humidity of 85%, the response of ZnO@ZIF-71/WO3 to NO2 remained essentially constant. The functional ZIF-71 layer not only improved the humidity immunity of ZnO@ZIF-71/WO3 but also enhanced the sensitivity and selectivity performance to NO2 at low operating temperatures. The ZnO@ZIF-71/WO3 sensor still provided a response of 88.41 to 100 ppm NO2 at room temperature.

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Active edge effect of pothole-rich WO3 nanosheets for enhancing dimethyl trisulfide gas sensing performance

Cited by 12 publications

References 46 publications

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Active W Sites Promoted by Defect Engineering Enhanced C₂H₆S₃ Sensing Performance of WO₃ Nanosheets

Heterojunctions of ZnO-Nanorod-Decorated WO₃ Nanosheets Coated with ZIF-71 for Humidity-Independent NO₂ Sensing

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Active edge effect of pothole-rich WO3 nanosheets for enhancing dimethyl trisulfide gas sensing performance

Cited by 12 publications

References 46 publications

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Active W Sites Promoted by Defect Engineering Enhanced C2H6S3 Sensing Performance of WO3 Nanosheets

Heterojunctions of ZnO-Nanorod-Decorated WO3 Nanosheets Coated with ZIF-71 for Humidity-Independent NO2 Sensing

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Product

Resources

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Active W Sites Promoted by Defect Engineering Enhanced C₂H₆S₃ Sensing Performance of WO₃ Nanosheets

Heterojunctions of ZnO-Nanorod-Decorated WO₃ Nanosheets Coated with ZIF-71 for Humidity-Independent NO₂ Sensing