P-n junctions based on CuO-decorated ZnO nanowires for ethanol sensing application

Zhao, Sikai; Shen, Yanbai; Hao, Fulai; Kang, Changke; Cui, Baoyu; Wei, Dezhou; Meng, Fanli

doi:10.1016/j.apsusc.2020.148140

Cited by 85 publications

(29 citation statements)

References 47 publications

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“…More importantly, composite metal oxides with one-dimensional (1D) nanostructures have been reported extensively in various applications, especially in lithium-ion batteries, electron devices, and catalysts − due to their higher energy densities, larger surface areas, and higher catalytic efficiencies than single metal oxide nanomaterials have. − Studies on the catalytic oxidation of CO over 1D nanomaterials have focused not only on single metal oxides, such as Co 3 O 4 nanorods, CeO 2 nanotubes, and CuO nanowires but also on hybrid metal oxides. For example, Au nanoparticles supported by ZnO nanowires exhibited a superior CO oxidation response and better stability than pure ZnO nanoparticles and nanowires, which is attributed to the heteroepitaxy of Au formed on the interface .…”

Section: Introductionmentioning

confidence: 99%

Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

Wang

et al. 2021

ACS Appl. Energy Mater.

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Flame in situ synthesis is regarded as a facile technique to fabricate onedimensional (1D) nanomaterials with the advantages of simple operation, shorter duration, and scale production. This work reports the flame synthesis of transition metal (Ce,Fe)anchored CuO nanowires on a copper substrate for CO catalytic oxidation. Thermal compressive stresses encourage the CuO nanowires to grow vertically along the grain boundaries, and the metal oxides are nucleated and embedded along the nanowires due to pyrolysis. We examined the catalytic performance of the as-grown catalysts toward CO oxidation, and the results showed that the CeFe-Cu catalyst exhibits outstanding activity near full conversion at 180 °C. With a reaction rate per unit mass of 1.38 mol g cat −1 s −1 and activation energy of 43.54 kJ mol −1 , the high activity of the CeFe-Cu catalyst benefits from the synergistic effects of Ce-Fe incorporation. Furthermore, the CeFe-Cu catalyst displays stable cycling performance over five runs and excellent stability in isothermal long-term catalysis tests at 140 °C. Kinetic analysis gives the rate equations for CO oxidation over the Ce-Cu, Fe-Cu, and CeFe-Cu catalysts and reveals the influential role of chemisorbed CO and lattice oxygen in the reaction. The catalytic oxidation of CO undergoes two reduction−oxidation steps as corroborated by the Mars Van Krevelen (MVK) model, and oxygen vacancies are crucial to facilitating the deep oxidation of CO, as confirmed by XPS. Meanwhile, combined with in situ Raman analysis, a reasonable mechanism is proposed. This work provides a fast method of designing 1D hybrid nanostructures for the abatement of carbon monoxide from exhaust gas emissions.

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Section: Introductionmentioning

confidence: 99%

Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

Wang

et al. 2021

ACS Appl. Energy Mater.

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“…The adsorption of NO 2 molecules could narrow the width of the depletion layer and facilitate the charge transfer at the heterojunction, thus resulting in further decreased resistance of the sensing lm. [47][48][49][50] The Au ND-ODT/a-Fe 2 O 3 /rGO-based sensor showed an enhanced sensing performance as compared with the a-Fe 2 O 3 / rGO sensor, for example, with at least three times higher response at 200 ppb (Fig. 2c).…”

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Ligand-assisted deposition of ultra-small Au nanodots on Fe₂O₃/reduced graphene oxide for flexible gas sensors

et al. 2022

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“…The electrons tend to diffuse from the ZnO to the ZnFe 2 O 4 . At the same time, a built-in electric field will be created at the interface to balance the diffusion motion [31]. Then, the interfacial electrons and holes are pulled to the opposite direction by the formed build-in electric field.…”

Section: Mechanismmentioning

confidence: 99%

Facile Fabrication of ZnO-ZnFe2O4 Hollow Nanostructure by a One-Needle Syringe Electrospinning Method for a High-Selective H2S Gas Sensor

et al. 2022

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Herein, a facile fabrication process of ZnO-ZnFe2O4 hollow nanofibers through one-needle syringe electrospinning and the following calcination process is presented. The various compositions of the ZnO-ZnFe2O4 nanofibers are simply created by controlling the metal precursor ratios of Zn and Fe. Moreover, the different diffusion rates of the metal oxides and metal precursors generate a hollow nanostructure during calcination. The hollow structure of the ZnO-ZnFe2O4 enables an enlarged surface area and increased gas sensing sites. In addition, the interface of ZnO and ZnFe2O4 forms a p-n junction to improve gas response and to lower operation temperature. The optimized ZnO-ZnFe2O4 has shown good H2S gas sensing properties of 84.5 (S = Ra/Rg) at 10 ppm at 250 ∘C with excellent selectivity. This study shows the good potential of p-n junction ZnO-ZnFe2O4 on H2S detection and affords a promising sensor design for a high-performance gas sensor.

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P-n junctions based on CuO-decorated ZnO nanowires for ethanol sensing application

Cited by 85 publications

References 47 publications

Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

Ligand-assisted deposition of ultra-small Au nanodots on Fe₂O₃/reduced graphene oxide for flexible gas sensors

Facile Fabrication of ZnO-ZnFe2O4 Hollow Nanostructure by a One-Needle Syringe Electrospinning Method for a High-Selective H2S Gas Sensor

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P-n junctions based on CuO-decorated ZnO nanowires for ethanol sensing application

Cited by 85 publications

References 47 publications

Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

Ligand-assisted deposition of ultra-small Au nanodots on Fe2O3/reduced graphene oxide for flexible gas sensors

Facile Fabrication of ZnO-ZnFe2O4 Hollow Nanostructure by a One-Needle Syringe Electrospinning Method for a High-Selective H2S Gas Sensor

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Ligand-assisted deposition of ultra-small Au nanodots on Fe₂O₃/reduced graphene oxide for flexible gas sensors