Ordered mesoporous NiFe2O4 with ultrathin framework for low-ppb toluene sensing

Lai, Xiaoyong; Cao, Kun; Shen, Guoxin; Xue, Ping; Wang, Dan; Hu, Fang; Zhang, Jianli; Yang, Qingfeng; Wang, Xiaozhong

doi:10.1016/j.scib.2018.01.015

Cited by 30 publications

(15 citation statements)

References 65 publications

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“…9). Our NiFe 2 O 4 -based sensor to toluene sensing is comparable to that of previous reports based on p-type sensing materials with unique morphologies and microstructures, as summarized in Table 1 [33][34][35][36][37][38][39][40].…”

Section: Gas-sensing Propertiessupporting

confidence: 83%

Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

et al. 2020

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The extensive use of toluene stimulates the effective detection by sensitive gas sensors based on unique materials. Here, hierarchical flower-like NiFe 2 O 4 with core-shell architecture was synthesized by a facile hydrothermal method in the presence of urea and NH 4 F. The controllable experiments indicated that the burr spheres and football-like samples were produced with individual urea or NH 4 F. The flower-like NiFe 2 O 4 sensor exhibited outstanding sensitivity of 19.95 to 100 9 10 -6 toluene with low detection limit (1 9 10 -6 ). Furthermore, the sensor showed superior sensing selectivity and longterm stability to toluene. The excellent sensing properties could largely arise from a combination of high surface area, numerous active sites, porous structures, and the native catalytic characteristics of NiFe 2 O 4 to facilitate toluene molecules adsorption, diffusion, and reaction.

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Section: Gas-sensing Propertiessupporting

confidence: 83%

Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

et al. 2020

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“…Based on the above reasons, several efforts have been already applied to enhance the sensing properties, such as optimization of the material structure and loading of a noble metal. More specifically, sensing materials with hierarchical architectures can contribute to the diffusion of gas molecules, increase the absorption of gas molecules, and ultimately promote the sensing property due to their unique structure, such as a high surface area, large pore volume, extraordinary shell permeability, and well-defined interior voids. − Moreover, nanosized noble metal particles decorated on the MOS surface can accommodate the Fermi energy level and induce the production of the Schottky barrier, directly enhancing the sensing response, selectivity, or response rate of the sensors. , …”

Section: Introductionmentioning

confidence: 99%

Au-Decorated ZnFe₂O₄ Yolk–Shell Spheres for Trace Sensing of Chlorobenzene

Luo

Gao

et al. 2020

ACS Appl. Mater. Interfaces

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Noble metals supported on metal oxides are promising materials for widely applying on gas sensors because of their enviable physical and chemical properties in enhancing the sensitivity and selectivity. Herein, pristine ZFO yolk–shell spheres composed of ultrathin nanosheets and ultrasmall nanoparticles decorated with nanosized Au particles with a diameter of 1–2 nm are fabricated using the method of solution-phase deposition–precipitation. As a result, the Au@ZFO yolk–shell sphere based sensor exhibits significantly sensing performances for chlorobenzene (CB). In comparison with pristine ZFO, the response (R air/R gas= 90.9) of a Au@ZFO based sensor with a low detection limit of 100 ppb increases 4-fold when exposed to 10 ppm chlorobezene at 150 °C. Excitingly, the sensing response for chlorobenzene is the highest among metal oxides semiconductor based sensors. Moreover, the sensors can be further applied in the field of chlorobenzene monitoring, owing to its outstanding selectivity. The results elaborated that the enhanced sensing mechanism is mainly attributed to the effects of electronic sensitization and chemical sensitization, which are induced by the Au nanoparticles on the surface of ZFO yolk–shell spheres. Density functional theory (DFT) calculations further illustrated that the existence of Au nanoparticles exhibits higher adsorption energy and net charge transfer for CB. In addition, the relationship between the sensing performances of pristine ZFO and Au@ZFO yolk–shell spheres for chlorobenzene and the factors of Au loading amount, operating temperature, and humidity was also fully investigated in this work.

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“…Finally, the products were desorbed from the catalyst surface into the surrounding environment in a gaseous state. The Ni–Fe spinel on the surface of the tubular manganese dioxide greatly increased the specific surface area of the catalyst, thus facilitating the access of VOCs to active sites . After the loading of Pt, the concentrations of transition metals in low valence states and of absorbed oxygen were increased, both of which promoted the generation of reactive oxygen species and greatly accelerated the combustion reactions of VOCs. , The synergistic effect between the manganese dioxide NTs, Ni–Fe spinel NPs, and platinum NPs appears to be very beneficial and significantly improves the performance of the catalyst …”

Section: Resultsmentioning

confidence: 99%

Low Temperature Combustion of VOCs with Enhanced Catalytic Activity Over MnO₂ Nanotubes Loaded with Pt and Ni–Fe Spinel

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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MnO 2 nanotubes loaded with Pt and Ni−Fe spinel were synthesized using simple hydrothermal and sol−gel techniques. After loading with Ni−Fe spinel, the specific surface area of the material increases 3-fold. This change helped to provide more active sites and facilitated the association between the catalyst and volatile organic compounds (VOCs). X-ray photoelectron spectroscopy determined that the adsorbed oxygen concentrations were all greatly increased after Pt loading, indicating that Pt promoted the adsorption of oxygen and so accelerated the combustion process. The performance of the catalyst after loading with 2 wt % Pt was greatly improved, such that the T 90 for benzene decomposition was decreased to 113 °C. In addition, the 2% Pt/2Mn@NFO exhibited excellent low-temperature catalytic activity when reacting with low concentrations of toluene and ethyl acetate. This work therefore demonstrates a viable new approach to the development of Mn-based catalysts for the low temperature catalytic remediation of VOCs.

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Ordered mesoporous NiFe2O4 with ultrathin framework for low-ppb toluene sensing

Cited by 30 publications

References 65 publications

Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

Au-Decorated ZnFe₂O₄ Yolk–Shell Spheres for Trace Sensing of Chlorobenzene

Low Temperature Combustion of VOCs with Enhanced Catalytic Activity Over MnO₂ Nanotubes Loaded with Pt and Ni–Fe Spinel

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Ordered mesoporous NiFe2O4 with ultrathin framework for low-ppb toluene sensing

Cited by 30 publications

References 65 publications

Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

Au-Decorated ZnFe2O4 Yolk–Shell Spheres for Trace Sensing of Chlorobenzene

Low Temperature Combustion of VOCs with Enhanced Catalytic Activity Over MnO2 Nanotubes Loaded with Pt and Ni–Fe Spinel

Contact Info

Product

Resources

About

Au-Decorated ZnFe₂O₄ Yolk–Shell Spheres for Trace Sensing of Chlorobenzene

Low Temperature Combustion of VOCs with Enhanced Catalytic Activity Over MnO₂ Nanotubes Loaded with Pt and Ni–Fe Spinel