Design of NiCo2O4 porous nanosheets/α-MoO3 nanorods heterostructures for ppb-level ethanol detection

Xu, Keng; Wei, Wenyan; Sun, Yue; Lü, Wenhui; Yu, Ting; Yang, Yong; Yuan, Cailei

doi:10.1016/j.powtec.2019.01.051

Cited by 25 publications

(13 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the NiCo 2 O 3 /MoO 3 materials have a high sensitivity to ethanol (20−1 ppm), but the selectivity is low in interfering gases, such as acetone, formaldehyde (about 12−1 ppm acetone, 8−1 ppm formaldehyde). 13 Therefore, it is highly desired to develop highly sensitive, selective, and also water-resistive MOX gas sensors for breath ethanol analysis. Among assorted metal oxides, indium oxide (In 2 O 3 ) is regarded as one of the most important sensing materials due to its suitable band gap, high electron mobility, and superior sensing properties to VOCs.…”

Section: Introductionmentioning

confidence: 99%

Sr-Doped Cubic In₂O₃/Rhombohedral In₂O₃ Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Song

Dou

Wang

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In recent years, it is urgent and challenging to fabricate highly sensitive and selective gas sensors for breath analyses. In this work, Sr-doped cubic In 2 O 3 /rhombohedral In 2 O 3 homojunction nanowires (NWs) are synthesized by one-step electrospun technology. The Sr doping alters the cubic phase of pure In 2 O 3 into the rhombohedral phase, which is verified by the high-resolution transmittance electron microscopy, X-ray diffraction, and Raman spectroscopy, and is attributable to the low cohesive energy as calculated by the density functional theory (DFT). As a proof-of-concept of fatty liver biomarker sensing, ethanol sensors are fabricated using the electrospun In 2 O 3 NWs. The results show that 8 wt % Sr-doped In 2 O 3 shows the highest ethanol sensing performance with a high response of 21−1 ppm, a high selectivity over other interfering gases such as methanol, acetone, formaldehyde, toluene, xylene, and benzene, a high stability measured in 6 weeks, and also a high resistance to high humidity of 80%. The outstanding ethanol sensing performance is attributable to the enhanced ethanol adsorption by Sr doping as calculated by DFT, the stable rhombohedral phase and the preferred (104) facet exposure, and the formed homojunctions favoring the electron transfer. All these results show the effective structural modification of In 2 O 3 by Sr doping, and also the great potency of the homojunction Sr-doped In 2 O 3 NWs for highly sensitive, selective, and stable breath ethanol sensing.

show abstract

Section: Introductionmentioning

confidence: 99%

Sr-Doped Cubic In₂O₃/Rhombohedral In₂O₃ Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Song

Dou

Wang

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Several studies show that low dimensional of MoO 3, such as nanorods [ 78 – 80 ], nanowires [ 48 , 81 ], nanobelts [ 82 , 83 ], nanoflakes [ 26 , 84 ], and nanosheets [ 45 , 49 , 85 ] have good performance as sensitive materials for toxic gas detection. However, some works reported that hierarchical 3D structures assembled by their low dimensional form offer higher performance due to their low density, high surface area, and porosity that allow more adsorption sites [ 86 , 87 ].…”

Section: Molybdenum Oxide (Moo 3 ) Gas Sensing Materialsmentioning

confidence: 99%

“…In another report, Xu et al . [ 80 ] examined the p-type of NiCo 2 O 4 nanosheet coated α-MoO 3 nanorods. The nanorods themselves were produced using the hydrothermal method with Mo powder as a precursor, while the composite of NiCo 2 O 4 / α -MoO 3 was prepared using a chemical deposition approach.…”

Section: Molybdenum Oxide (Moo 3 ) Gas Sensing Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

View full text Add to dashboard Cite

Molybdenum-based materials have been intensively investigated for high-performance gas sensor applications. Particularly, molybdenum oxides and dichalcogenides nanostructures have been widely examined due to their tunable structural and physicochemical properties that meet sensor requirements. These materials have good durability, are naturally abundant, low cost, and have facile preparation, allowing scalable fabrication to fulfill the growing demand of susceptible sensor devices. Significant advances have been made in recent decades to design and fabricate various molybdenum oxides- and dichalcogenides-based sensing materials, though it is still challenging to achieve high performances. Therefore, many experimental and theoretical investigations have been devoted to exploring suitable approaches which can significantly enhance their gas sensing properties. This review comprehensively examines recent advanced strategies to improve the nanostructured molybdenum-based material performance for detecting harmful pollutants, dangerous gases, or even exhaled breath monitoring. The summary and future challenges to advance their gas sensing performances will also be presented.

show abstract

“…One is to synthesize materials with larger specific surface areas, which is attributed to the conclusion that the micromorphology features have an impact on the gas-sensitive process (Zhou et al, 2018b;Zhu et al, 2018;Wang et al, 2019b;Wei Z. J. et al, 2019). Considering the changes in the materials that are caused by doping and compounding or the catalytic effect of the introduced material on the sensing process, it is also desirable to improve the properties of the materials by introducing other elements or substances (Mousavi-Zadeh and Rahmani, 2018;Zhou et al, 2018a;Wang et al, 2019c;Xu et al, 2019). Therefore, the optimization strategies of MoO 3 based on controllable morphology synthesis and functional modification were comprehensively summarized in this mini review.…”

Section: Introductionmentioning

confidence: 99%

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Wang¹,

Zhou²,

Peng³

et al. 2020

Front. Chem.

View full text Add to dashboard Cite

As a typical n-type semiconductor, MoO 3 has been widely applied in the gas-detection field due to its competitive physicochemical properties and ecofriendly characteristics. Volatile organic compounds (VOCs) are harmful to the atmospheric environment and human life, so it is necessary to quickly identify the presence of VOCs in the air. This review briefly introduced the application progress of an MoO 3-based sensor in VOCs detection. We mainly emphasized the optimization strategies of a high performance MoO 3 , which consists of morphology-controlled synthesis and electronic properties functional modification. Besides the general synthesis methods, its gas-sensing properties and mechanism were briefly discussed. In conclusion, the application status of MoO 3 in gas-sensing and the challenges still to be solved were summarized.

show abstract

Design of NiCo2O4 porous nanosheets/α-MoO3 nanorods heterostructures for ppb-level ethanol detection

Cited by 25 publications

References 50 publications

Sr-Doped Cubic In₂O₃/Rhombohedral In₂O₃ Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Sr-Doped Cubic In₂O₃/Rhombohedral In₂O₃ Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Contact Info

Product

Resources

About

Design of NiCo2O4 porous nanosheets/α-MoO3 nanorods heterostructures for ppb-level ethanol detection

Cited by 25 publications

References 50 publications

Sr-Doped Cubic In2O3/Rhombohedral In2O3 Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Sr-Doped Cubic In2O3/Rhombohedral In2O3 Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Contact Info

Product

Resources

About

Sr-Doped Cubic In₂O₃/Rhombohedral In₂O₃ Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies

Sr-Doped Cubic In₂O₃/Rhombohedral In₂O₃ Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies