Preparation and photoelectric properties of semiconductor MoO2 micro/nanospheres with wide bandgap

Xiang, Zhongcheng; Zhang, Qin; Zhang, Zhong; Xu, Xijin; Wang, QingBao

doi:10.1016/j.ceramint.2014.09.017

Cited by 40 publications

(10 citation statements)

References 29 publications

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“…MoO 2 exhibits unusual properties among oxides, shifting from one with metallic properties into a semiconductor when the structural disorder increases. [14,15,16,17]. MoO 3 is n-type semiconductor [18].…”

Section: Introductionmentioning

confidence: 99%

Compositional effects on the electrical properties of extremely disordered molybdenum oxynitrides thin films

Hofer

Bengió

Rozas

et al. 2020

Materials Chemistry and Physics

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We report on the influence of the chemical composition on the electronic properties of molybdenum oxynitrides thin films grown by reactive sputtering on Si (100) substrates at room temperature. The partial pressure of Ar was fixed at 90 %, and the remaining 10 % was adjusted with mixtures N 2 :O 2 (varying from pure N 2 to pure O 2 ). The crystalline and electronic structures and the electrical transport of the films depend on the chemical composition. Thin films grown using oxygen mixtures up 2 % have γ-Mo 2 N phase and display superconductivity. The superconducting critical temperature T c reduces from ~ 6.8 K to below 3.0 K as the oxygen increases. On the other hand, films grown using oxygen mixtures richer than 2 % are mostly amorphous. The electrical transport shows a semiconductor-like behavior with variable-range hopping conduction at low temperatures. The analysis of the optical properties reveals that the samples have not a defined semiconductor band gap, which can be related to the high structural disorder and the excitation of electrons in a wide range of energies.

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Section: Introductionmentioning

confidence: 99%

Compositional effects on the electrical properties of extremely disordered molybdenum oxynitrides thin films

Hofer

Bengió

Rozas

et al. 2020

Materials Chemistry and Physics

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“…MoO2 were prepared by a simple hydrothermal process [45,46] MoSe2 was synthesized by a hydrothermal method [47,48]. 0.48 g Na2MoO4 (2.0 mmol) was dispersed in 50 mL double distilled water under continuous stirring to form a transparent solution.…”

Section: Preparation Of Photocatalystsmentioning

confidence: 99%

Enhanced visible-light photocatalytic hydrogen evolution activity of Er3+:Y3Al5O12/PdS–ZnS by conduction band co-catalysts (MoO2, MoS2 and MoSe2)

Song

Wei

Yang

et al. 2016

International Journal of Hydrogen Energy

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Several conduction band co-catalysts (CBCOs), MoO2, MoS2 and MoSe2, were prepared to improve the visible-light photocatalytic hydrogen evolution activity of Er 3+ :Y3Al5O12/PdS-ZnS from water splitting, in which the PdS is a valence band co-catalyst (VBCO) used to facilitate the photo-generated hole transfer and the Er 3+ :Y3Al5O12 is an up-conversion luminescence agent from visible light to ultraviolet light used to provide the ultraviolet light satisfying the energy demands of wide band-gap ZnS photocatalyst. XRD, SEM, TEM and EDX analyses were employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. UV-vis absorption and PL spectra were also determined to explore luminescence effect of the Er 3+ :Y3Al5O12. The visible-light photocatalytic hydrogen evolution activity of the prepared photocatalysts was evaluated by using Na2S and Na2SO3 as sacrificial reagents in aqueous solution under visible light irradiation. The influential factors such as contents of CBCOs (MoO2, MoS2 and MoSe2) and visible-light irradiation time on visible-light photocatalytic hydrogen evolution of Er 3+ :Y3Al5O12/PdS-ZnS-MoX2 (X = O, S and Se) were investigated in detail. Particularly, Er 3+ :Y3Al5O12/PdS-ZnS-MoSe2 with 0.30 wt% MoSe2 shows the highest

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“…However, there have been few reports on H 2 S sensors fabricated with MoO 2 . The preparation methodology of MoO 2 needs to be improved as well-MoO 2 is usually synthesized by the reduction of MoO 3 with H 2 or CO at ultrahigh temperature, which exhibits enormous risk of explosion Prabhakar et al, 2018); conventional solvothermal/hydrothermal methods are milder ways to prepare MoO 2 , however, the long processing time, additional surfactants and low yield restricts its application (Xiang et al, 2015;Wang et al, 2016;Zhang et al, 2019). Microwave-assisted solvothermal method is a promising alternative method for the preparation of MoO 2 .…”

Section: Introductionmentioning

confidence: 99%

MoO2 Nanospheres Synthesized by Microwave-Assisted Solvothermal Method for the Detection of H2S in Wide Concentration Range at Low Temperature

Shu-cai

et al. 2021

Front. Mater.

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It is crucial to develop highly energy-efficient and selective sensors for wide concentration range of H2S, a common toxic gas that widely exists in petrochemical industries. In this work, MoO2 nanospheres were rapidly synthesized by microwave-assisted solvothermal method, and were subsequently fabricated into H2S gas sensor. The MoO2 nanospheres-based sensor exhibited excellent response toward H2S with good linearity in a wide concentration range (10–240 ppm). Besides, this sensor presented low working temperature, good repeatability, and selectivity against CH4, H2, and CO. The outstanding sensing performance results from the reaction between H2S and abundant chemisorbed oxygen introduced by oxygen vacancies of MoO2. This result indicates that MoO2 nanosphere synthesized by microwave-assisted solvothermal method is a promising sensing material for H2S detection.

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Preparation and photoelectric properties of semiconductor MoO2 micro/nanospheres with wide bandgap

Cited by 40 publications

References 29 publications

Compositional effects on the electrical properties of extremely disordered molybdenum oxynitrides thin films

Compositional effects on the electrical properties of extremely disordered molybdenum oxynitrides thin films

Enhanced visible-light photocatalytic hydrogen evolution activity of Er3+:Y3Al5O12/PdS–ZnS by conduction band co-catalysts (MoO2, MoS2 and MoSe2)

MoO2 Nanospheres Synthesized by Microwave-Assisted Solvothermal Method for the Detection of H2S in Wide Concentration Range at Low Temperature

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