Hydrothermal synthesis of h-MoO3 microrods and their gas sensing properties to ethanol

Liu, Yueli; Yang, Shuang; Yu, Lu; Podval’naya, N. V.; Chen, Wen; Захарова, Г. С.

doi:10.1016/j.apsusc.2015.10.071

Cited by 75 publications

(22 citation statements)

References 41 publications

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“…MoO 3 is also used as a catalyst in the industrial production of acrylonitrile from propylene and ammonia. However, the constant interest in nanomaterials has made also nano MoO 3 attractive, which has been proven to be a promising candidate in many fields, e.g., (photo)catalysis, gas sensing, electrochemical cells, or even in forensic science and photothermal therapy [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, neither the different reaction times nor the role of CTAB (cetyltrimethylammonium bromide) and CrCl 3 additives have been studied yet at temperatures above 200-210 • C in the hydrothermal synthesis of MoO 3 . Furthermore, so far the gas sensing properties mostly of o-and h-MoO 3 were tested [10,[19][20][21][22][23][24][25][26][27][28][29][30]. To the best of our knowledge, there is only one paper reporting the gas sensing of m-MoO 3 , where very brief gas sensing data are given using H 2 O and CO 2 as test gases [31].…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Synthesis and Gas Sensing of Monoclinic MoO3 Nanosheets

et al. 2020

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Effects of different reaction parameters in the hydrothermal synthesis of molybdenum oxides (MoO3) were investigated and monoclinic (β-) MoO3 was prepared hydrothermally for the first time. Various temperatures (90/210 °C, and as a novelty 240 °C) and durations (3/6 h) were used. At 240 °C, cetyltrimethylammonium bromide (CTAB) and CrCl3 additives were also tested. Both the reaction temperatures and durations played a significant role in the formation of the products. At 90 °C, h-MoO3 was obtained, while at 240 °C the orthorhombic (α-) MoO3 formed with hexagonal rod-like and nanofibrous morphology, respectively. The phase transformation between these two phases was observed at 210 °C. At this temperature, the 3 h reaction time resulted in the mixture of h- and α-MoO3, but 6 h led to pure α-MoO3. With CTAB the product was bare o-MoO3, however, when CrCl3 was applied, pure metastable m-MoO3 formed with the well-crystallized nanosheet morphology. The gas sensing of the MoO3 polymorphs was tested to H2, which was the first such gas sensing study in the case of m-WO3. Monoclinic MoO3 was found to be more sensitive in H2 sensing than o-MoO3. This initial gas sensing study indicates that m-MoO3 has promising gas sensing properties and this MoO3 polymorph is promising to be studied in detail in the future.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Gas Sensing of Monoclinic MoO3 Nanosheets

et al. 2020

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“…Assuming direct band gap (E g = 3.43 eV), absorption edge should be located at about 360 nm; however, pristine MoO 3 layer absorbs light also at higher wavelengths. Thus, the indirect band gap equals to about 2.75 eV is also credible [26][27][28][29]. However, MoO 3 tends to form oxygen vacancies; thus, the absorption in the visible range of light can be related to the presence of the defect states within the band gap [30].…”

Section: Energy Band Position Of Moomentioning

confidence: 94%

Photoinduced K+ Intercalation into MoO3/FTO Photoanode—the Impact on the Photoelectrochemical Performance

et al. 2019

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In this work, thin layers of MoO 3 were tested as potential photoanodes for water splitting. The influence of photointercalation of alkali metal cation (K +) into the MoO 3 structure on the photoelectrochemical properties of the molybdenum trioxide films was investigated for the first time. MoO 3 thin films were synthesized via thermal annealing of thin, metallic Mo films deposited onto the FTO substrate using a magnetron sputtering system. The Tauc and Mott-Schottky plots analysis were performed in order to determine the energy bands position of the investigated material. The photointercalation effect of K + on photoelectrochemical properties of FTO/MoO 3 photoanodes was studied using electrochemical techniques performed under simulated solar light illumination. It was proven that pristine MoO 3 layers cannot act as effective photoanodes for water splitting due to the utilization of the photoexcited electrons in the intercalation process. The photochromic phenomenon related to Mo 6+ centers reduction, and K + intercalation occurs at a potential range in which the photoanode exhibits photoelectrochemical activity towards water photooxidation.

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“…As a typical n-type semiconductor material with a suitable band gap (2.39-2.9 eV) (Yan et al, 2016), MoO 3 has attracted wide attention because of its distinctive gas sensing performances in the detection of many gases (Liu et al, 2015;Xia et al, 2016;Li, 2017;Zhou et al, 2017;Yang et al, 2018). Researchers have been devoted to designing nanomaterials with more suitable properties, and two methods have proved effective through unremitting efforts.…”

Section: Introductionmentioning

confidence: 99%

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

Wang¹,

Zhou²,

Peng³

et al. 2020

Front. Chem.

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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.

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Hydrothermal synthesis of h-MoO3 microrods and their gas sensing properties to ethanol

Cited by 75 publications

References 41 publications

Hydrothermal Synthesis and Gas Sensing of Monoclinic MoO3 Nanosheets

Hydrothermal Synthesis and Gas Sensing of Monoclinic MoO3 Nanosheets

Photoinduced K+ Intercalation into MoO3/FTO Photoanode—the Impact on the Photoelectrochemical Performance

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

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