Synthesis of Ni-doped α-MoO3 nanolamella and their improved gas sensing properties

Shen, Jingli; Guo, Sijia; Chen, Chuan; Sun, L.; Wen, Shizhu; Chen, Yu; Ruan, Shengping

doi:10.1016/j.snb.2017.06.040

Cited by 69 publications

(15 citation statements)

References 40 publications

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“…As shown in Figure a, the Mo 3 d core‐level spectrum is dominated by the Mo 3 d 5/2 and 3 d 3/2 doublet at 233.3 and 236.4 eV, respectively, which are associated with the Mo 6+ oxidation state. [ 78 ] In addition, the peak fitting reveals minor shoulders at 235.2 eV, which are ascribed to the 3 d doublet of reduced Mo 5+ (blue line), commonly observed in thermally grown MoO 3 due to the prevalence of native defects (e.g., oxygen vacancies). [ 79 ] However, it should be noted that the ratio of Mo 5+ /Mo 6+ is less than 3.7%, indicating that the amount of nonstoichiometric MoO 3 is marginal.…”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive NO₂ Gas Sensors Based on Layered α‐MoO₃ Nanoribbons

Xing

Liu

et al. 2021

Adv Materials Technologies

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The detection and monitoring of nitrogen dioxide (NO2) plays a vital role in the environmental, healthcare, farming, and industrial sectors. However, the development of NO2 gas sensors with simultaneously high sensitivity, reversibility, low detection limit, and excellent selectivity remains challenging. In this work, an ultrasensitive NO2 gas sensor with superb selectivity and reversibility is demonstrated based on α‐phase molybdenum trioxide (α‐MoO3). Nanoribbons of α‐MoO3 are synthesized via vapor phase transport (VPT) and systematically characterized using a combination of advanced characterization probes. At an optimal operating temperature of 125 °C, the α‐MoO3‐based sensor shows a very high sensitivity toward NO2 with a detection limit as low as 24 ppb, while also exhibiting excellent selectivity and reversibility. Such impressive performance originates from the layered nature of the α‐MoO3 nanoribbons as well as the hierarchical assembly of the nanoribbons as the sensing layer. The study demonstrates a facile sensing platform based on α‐MoO3 for ultrasensitive and selective NO2 gas sensing.

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Section: Resultsmentioning

confidence: 99%

Ultrasensitive NO₂ Gas Sensors Based on Layered α‐MoO₃ Nanoribbons

Xing

Liu

et al. 2021

Adv Materials Technologies

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“…The chemical states of Mo and O atoms in α‐MoO 3 were investigated by XPS spectrum. Mo is in its highest oxidation state of +6 as indicated by Mo 3d 5/2 (BE = 233.1 eV) and Mo 3d 3/2 (BE = 236.2 eV) (Figure A) . The appearance of Mo 3d 5/2 (BE = 234.3 eV) and Mo 3d 3/2 (BE = 237.5 eV) may be ascribed to the existence of Mo 2+ .…”

Section: Resultsmentioning

confidence: 96%

Self‐assembly of α‐MoO₃ flower as a highly effective organics adsorbent for water purification

Zhang

Liang

et al. 2018

J Am Ceram Soc

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We report α‐MoO3 flowers as a highly effective organics adsorbent for the first time. With α‐MoO3 microfibers (MFs), α‐MoO3 flowers uniformly self‐assemble on a carbon cloth, serving as a great organics scavenger. They not only provide a high specific surface area but also possess van der Waals force, both of which guarantee a high adsorption efficiency for multiple organics. Nearly 100% of Rhodamine B (RhB), methylene blue (MB), and crystal violet (CV) are rapidly adsorbed while flowing through the designed α‐MoO3 flower‐based filtration device. Even after five recycling times, its high adsorption efficiency toward RhB remains unaffected. The adsorption capacity of α‐MoO3 flowers for RhB, MB, and CV reaches up to 4974, 6217, and 3886 mg/m2, respectively. Additionally, this novel adsorbent can adapt to a wide pH range, maintaining the excellent capacity of 4774 and 4473 mg/m2 toward RhB at pH of 2.0 and 12.0. The α‐MoO3 flowers can also adsorb other organics, including MO, noroxin, and tetracycline hydrochloride. Moreover, the free‐standing α‐MoO3 flowers on a carbon cloth realize the adsorptive filtration for organics removal, which not only require no conditions and no energy consumption but also avoid secondary pollution to the water as compared to the powdery adsorbents.

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“…However, for MOS gas sensing materials, the number of the surface active site of the sensing materials is almost constant at a certain operating temperature. Therefore, the sensor response would gradually become saturated with the further increase of H 2 S concentration for the reason that there are no more active sites available for the adsorption and reaction of H 2 S molecules [44,45]. Specifically, it is worth mentioning that the sensor still exhibits a notable response of 1.5 at a relatively low H 2 S concentration of 50 ppb, indicating a promising application potential in the monitoring of trace amount of H 2 S.…”

Section: Resultsmentioning

confidence: 99%

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

et al. 2019

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One-dimensional Zn-doped α-Fe2O3 nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-Fe2O3 nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-Fe2O3 is significantly influenced by the introduction of Zn2+. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-Fe2O3 nanowires showed excellent H2S sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low H2S detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-Fe2O3 nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and H2S molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials.

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Synthesis of Ni-doped α-MoO3 nanolamella and their improved gas sensing properties

Cited by 69 publications

References 40 publications

Ultrasensitive NO₂ Gas Sensors Based on Layered α‐MoO₃ Nanoribbons

Ultrasensitive NO₂ Gas Sensors Based on Layered α‐MoO₃ Nanoribbons

Self‐assembly of α‐MoO₃ flower as a highly effective organics adsorbent for water purification

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

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Synthesis of Ni-doped α-MoO3 nanolamella and their improved gas sensing properties

Cited by 69 publications

References 40 publications

Ultrasensitive NO2 Gas Sensors Based on Layered α‐MoO3 Nanoribbons

Ultrasensitive NO2 Gas Sensors Based on Layered α‐MoO3 Nanoribbons

Self‐assembly of α‐MoO3 flower as a highly effective organics adsorbent for water purification

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

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Ultrasensitive NO₂ Gas Sensors Based on Layered α‐MoO₃ Nanoribbons

Ultrasensitive NO₂ Gas Sensors Based on Layered α‐MoO₃ Nanoribbons

Self‐assembly of α‐MoO₃ flower as a highly effective organics adsorbent for water purification