Dissolution–recrystallization and regrowth mechanism of hydrothermally derived six faceted prismatic hexagonal ZnO microrods

Kale, Rohidas B.

doi:10.1016/j.ijleo.2015.03.009

Cited by 6 publications

(2 citation statements)

References 43 publications

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“… The morphology transformation of WO 3 ·H 2 O nanoplates to urchin-like W 18 O 49 nanowires could plausibly occur via a dissolution and recrystallization/regrowth mechanism. There are several reports on such dissolution and recrystallization of different metal and metal oxides. − Xi et al reported hydrothermal growth of selenium nanotubes from sphere-like microparticles in NaOH . The temperature and concentrations of NaOH was reported to strongly affect the growth mechanism of selenium nanostructures.…”

Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

Nayak

Pradhan

2018

J. Phys. Chem. C

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Exploring semiconductor materials with superior photocatalytic activity is desirable to mitigate the crisis associated with rapid depletion of fossil fuels and environmental pollutions. Herein we report the synthesis of orthorhombic stacked WO3·H2O square nanoplates by mixing WCl6 (0.025 M) in ethanol at room temperature via a precipitation method. On the other hand, hierarchical urchin-like W18O49 nanostructures composed of nanowires were synthesized from the preceding solution within 10 min through a microwave-assisted route. The morphology evolution from nanoplates to nanowires proceeds through a dissolution and recrystallization mechanism, as demonstrated in detail by varying the reaction duration and temperature. The as-synthesized WO3·H2O nanoplates and W18O49 nanowires were employed for the photocatalytic degradation of rhodamine B and photoelectrocatalytic hydrogen generation through water splitting in a neutral medium. Furthermore, the as-synthesized W18O49 nanostructures are employed as electrocatalysts for hydrogen evolution reaction in both acidic and neutral electrolytes. The enhanced electrocatalytic and photocatalytic activity of W18O49 nanostructures are attributed to their larger surface area, oxygen vacancies, and faster charge transport properties. This work demonstrates a greener and simpler way to synthesize a promising defect-rich material (W18O49) in a short duration and its potential in electrocatalytic and photoelectrocatalytic hydrogen generation, and for degradation of pollutant.

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Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

Nayak

Pradhan

2018

J. Phys. Chem. C

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“…1(b), the tungsten foil was subjected to HT growth in 1.0 M HNO 3 solution for 30 min at different temperatures of 50, 70, 90, and 110 °C. Since a layer of tungstite (WO 3 1 H 2 O), analogous to the dissolution-recrystallization growth mechanism, 20) is usually formed when tungsten is immersed in nitric acid, 21) thermal annealing at 300 °C in air for 30 min was carried out to transform tungstite into WO 3 NSs. Figure 1(c) shows the package of the sensing electrodes.…”

Section: Experimental Methodsmentioning

confidence: 99%

Super-Nernstian pH sensors based on WO₃nanosheets

Kuo

Wang

et al. 2018

Jpn. J. Appl. Phys.

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The effects of the surface morphology of hydrothermally grown WO 3 nanosheets (NSs) and sputtering WO 3 film on the performance of pH sensing electrodes are presented and compared in the pH range of 2-12. Using a separated electrode of an extended-gate field-effect transistor (EGFET) configuration, the WO 3 nanosheet (NS) pH sensor shows a sensitivity of 63.37 mV/pH, a good linearity of 0.9973, a low voltage hysteresis of 4.79 mV, and a low drift rate of 3.18 mV/h. In contrast, the film-type one shows a typical sensitivity of only 50.08 mV/pH and a linearity of 0.9932. The super-Nernstian response could be attributed to the significant increase in the number of surface ion adsorption sites of the NS structure and the occurrence of local electric field enhancement over the sharp edges and corners of WO 3 NSs.

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Optical and photocatalytic property of Fe modified tetrapod-shaped ZnO whiskers synthesized by thermal evaporation method

Xian

2016

Optik

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Dissolution–recrystallization and regrowth mechanism of hydrothermally derived six faceted prismatic hexagonal ZnO microrods

Cited by 6 publications

References 43 publications

Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

Super-Nernstian pH sensors based on WO₃nanosheets

Optical and photocatalytic property of Fe modified tetrapod-shaped ZnO whiskers synthesized by thermal evaporation method

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Dissolution–recrystallization and regrowth mechanism of hydrothermally derived six faceted prismatic hexagonal ZnO microrods

Cited by 6 publications

References 43 publications

Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

Super-Nernstian pH sensors based on WO3nanosheets

Optical and photocatalytic property of Fe modified tetrapod-shaped ZnO whiskers synthesized by thermal evaporation method

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Super-Nernstian pH sensors based on WO₃nanosheets