2D-MoO<sub>3</sub>nanosheets for superior gas sensors

Ji, Fen; Ren, Xianpei; Zheng, Xiaoyao; Liu, Yucheng; Pang, Liuqing; Jiang, Jia‐Xing; Liu, Shengzhong

doi:10.1039/c6nr00880a

Cited by 168 publications

(115 citation statements)

References 34 publications

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“…Amongst the main studied transition-metal oxides, zinc oxide (ZnO) and molybdenum oxides have attracted much attention for their potential application in lithium-ion batteries 56, 57 , supercapacitors 58 , dye removal 50, 51 , pigments 59 , gas sensors 60, 61 , and light emitting devices 62, 63 . In particular, ZnO has the potential for many applications due to its unique physical and chemical properties, such as high energy density, high electrochemical coupling coefficient, and broad range of radiation absorption 64 .…”

Section: Introductionmentioning

confidence: 99%

Morphology Transition Engineering of ZnO Nanorods to Nanoplatelets Grafted Mo8O23-MoO2 by Polyoxometalates: Mechanism and Possible Applicability to other Oxides

Abdelmohsen

Rouby

Ismail

et al. 2017

Sci Rep

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A new fundamental mechanism for reliable engineering of zinc oxide (ZnO) nanorods to nanoplatelets grafted Mo8O23-MoO2 mixed oxide with controlled morphology, composition and precise understanding of the nanoscale reaction mechanism was developed. These hybrid nanomaterials are gaining interest due to their potential use for energy, catalysis, biomedical and other applications. As an introductory section, we demonstrate a new expansion for the concept ‘materials engineering’ by discussing the fabrication of metal oxides nanostructures by bottom-up approach and carbon nanoparticles by top-down approach. Moreover, we propose a detailed mechanism for the novel phenomenon that was experienced by ZnO nanorods when treated with phosphomolybdic acid (PMA) under ultra-sonication stimulus. This approach is expected to be the basis of a competitive fabrication approach to 2D hybrid nanostructures. We will also discuss a proposed mechanism for the catalytic deposition of Mo8O23-MoO2 mixed oxide over ZnO nanoplatelets. A series of selection rules (SRs) which applied to ZnO to experience morphology transition and constitute Abdelmohsen theory for morphology transition engineering (ATMTE) will be demonstrated through the article, besides a brief discussion about possibility of other oxides to obey this theory.

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Section: Introductionmentioning

confidence: 99%

Morphology Transition Engineering of ZnO Nanorods to Nanoplatelets Grafted Mo8O23-MoO2 by Polyoxometalates: Mechanism and Possible Applicability to other Oxides

Abdelmohsen

Rouby

Ismail

et al. 2017

Sci Rep

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“…The α-MoO 3 forming MoO 3−x can reduce the bandgap and enhance charge carrier mobility. Compared with the bulk MoO 3 , 2D-MoO 3 nanosheets had a better chemical sensor performance due to the 2D structure with a large surface area and more reactive sites [48] (see Figure 2f). Cheng et al [49] reported that MoO 3−x nanosheets can display strong LSPR from the visible to the near-infrared region, owing to the layered crystal structure, which could be used as highly efficient catalysts for the hydrogen generation from ammonia borane with visible light irradiation.…”

Section: The Morphology Of Nanostructured Moomentioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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This paper mainly focuses on the application of nanostructured MoO 3 materials in both energy and environmental catalysis fields. MoO 3 has wide tunability in bandgap, a unique semiconducting structure, and multiple valence states. Due to the natural advantage, it can be used as a high-activity metal oxide catalyst, can serve as an excellent support material, and provide opportunities to replace noble metal catalysts, thus having broad application prospects in catalysis. Herein, we comprehensively summarize the crystal structure and properties of nanostructured MoO 3 and highlight the recent significant research advancements in energy and environmental catalysis. Several current challenges and perspective research directions based on nanostructured MoO 3 are also discussed.Molecules 2020, 25, 18 2 of 26 applications in energy and environmental catalysis on account of their relatively low cost, high activity, and stability [9][10][11][12].Molybdenum oxide (MoO 3 ), a kind of transition metal oxide with a n-type semiconducting, nontoxic nature and high stability, has attracted a lot of attention. In particular, nanostructured MoO 3 has demonstrated superior properties to bulk MoO 3 , which is successfully employed in rechargeable batteries [13], capacitors [14], photocatalysis [15], electrocatalysis [16], gas sensors [17], and other applications [6]. The extended tunnels between the MoO 6 octahedra in MoO 3 are suitable for insert/de-insert mobile ions, such as H + and Li + , and multiple oxidation states can enable rich redox reactions. Moreover, the superiorities of low cost, chemical stability, high theoretical specific capacity (1117 mA·h/g), and the environmentally friendly nature make nanostructured MoO 3 exceptional electrode materials for rechargeable batteries capacitors [13,18]. MoO 3 has been investigated as the photocatalyst in terms of its anisotropic layered structure for absorbing UV, as well as visible light. Introducing a defect band by H + intercalation or oxygen vacancies can create defect state and decrease MoO 3 bandgap, which effectively increase the photocatalytic activity [15]. Each oxygen atom bonds to only one molybdenum atom of MoO 6 octahedra, and oxygen vacancy generates Mo dangling bond. MoO 3 favors the adsorption of water molecules in oxygen vacancies, which act as electron acceptors and consequently reduce the energy barrier make it highly reactive for electrocatalysis [2,19]. As a good gasochromic material, MoO 3 has efficient positive-ion accommodation and good charge transfer, and it can be used as an optical-based gas sensor. Moreover, relying on the change in the conductance of the oxide-on-gas adsorption/reaction, MoO 3 has been used for NO, NO 2 , CO, H 2 , NH 3 , and other gases [17]. The unique structure strongly affects the performances. Large efforts have been made to obtain nanostructured MoO 3 with appealing properties by engineering multiple synthetic strategies for the applications in various fields. A variety of methods have been developed, including hydrothermal met...

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“…For example, 2D MoO 3 exhibits a strong blue-shift when the lateral dimension reduces, as ascribed to the quantum size effect [44]. As a consequence, the strong quantum confinement effect leads to the enhanced band gap opening.…”

Section: Thin 2d Metal Oxidesmentioning

confidence: 99%

“…MoO 3 nanosheet samples were found to exhibit significantly enhanced alcohol vapor sensing performance compared to the bulk MoO 3 . It also was found that both the sensor response and recovery time were reduced significantly [44]. Sun et al described the synthesis of ultrathin two-dimensional transition metal oxide nanosheets [15].…”

Section: Thin 2d Metal Oxidesmentioning

confidence: 99%

Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

113

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Abstract:Since the first report of graphene, thin two-dimensional (2D) nanomaterials with atomic or molecular thicknesses have attracted great research interest for gas sensing applications. This was due to the distinctive physical, chemical, and electronic properties related to their ultrathin thickness, which positively affect the gas sensing performances. This feature article discusses the latest developments in this field, focusing on the properties, preparation, and sensing applications of thin 2D inorganic nanomaterials such as single-or few-layer layered double hydroxides/transition metal oxides/transition metal dichalcogenides. Recent studies have shown that thin 2D inorganic nanomaterials could provide monitoring of harmful/toxic gases with high sensitivity and a low concentration detection limit by means of conductometric sensors operating at relatively low working temperatures. Promisingly, by using these thin 2D inorganic nanomaterials, it may open a simple way of improving the sensing capabilities of conductometric gas sensors.

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2D-MoO₃nanosheets for superior gas sensors

Cited by 168 publications

References 34 publications

Morphology Transition Engineering of ZnO Nanorods to Nanoplatelets Grafted Mo8O23-MoO2 by Polyoxometalates: Mechanism and Possible Applicability to other Oxides

Morphology Transition Engineering of ZnO Nanorods to Nanoplatelets Grafted Mo8O23-MoO2 by Polyoxometalates: Mechanism and Possible Applicability to other Oxides

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Thin 2D: The New Dimensionality in Gas Sensing

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2D-MoO3nanosheets for superior gas sensors

Cited by 168 publications

References 34 publications

Morphology Transition Engineering of ZnO Nanorods to Nanoplatelets Grafted Mo8O23-MoO2 by Polyoxometalates: Mechanism and Possible Applicability to other Oxides

Morphology Transition Engineering of ZnO Nanorods to Nanoplatelets Grafted Mo8O23-MoO2 by Polyoxometalates: Mechanism and Possible Applicability to other Oxides

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Thin 2D: The New Dimensionality in Gas Sensing

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2D-MoO₃nanosheets for superior gas sensors