A study of control growth of three-dimensional nanowire networks of tungsten oxides: From aligned nanowires through hybrid nanostructures to 3D networks

Li, Z.L.; Fei, Liu; Xu, Ning; Deng, Shaozhi

doi:10.1016/j.jcrysgro.2009.11.036

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…However, the excessively high electron–hole recombination rate limits the availability, weakening the oxidation reduction ability and the catalytic effect. To enhance the performance of tungsten oxide nanowires for subsequent applications, several strategies are commonly used, including morphology control [ 10 ], metal doping [ 11 ], precious metal modification [ 12 ], and construction of composite materials [ 9 ]. In particular, doping is an effective method to adjust the structure of the electron band; the position of the valence and conduction band can be adjusted by metal replacement.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapor Deposition-Fabricated Manganese-Doped and Potassium-Doped Hexagonal Tungsten Trioxide Nanowires with Enhanced Gas Sensing and Photocatalytic Properties

Chen

Yang

et al. 2022

Nanomaterials

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Owing to its unique and variable lattice structure and stoichiometric ratio, tungsten oxide is suitable for material modification; for example, doping is expected to improve its catalytic properties. However, most of the doping experiments are conducted by hydrothermal or multi-step synthesis, which is not only time-consuming but also prone to solvent contamination, having little room for mass production. Here, without a catalyst, we report the formation of high-crystallinity manganese-doped and potassium-doped tungsten oxide nanowires through chemical vapor deposition (CVD) with interesting characterization, photocatalytic, and gas sensing properties. The structure and composition of the nanowires were characterized by transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS), respectively, while the morphology and chemical valence were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. Electrical measurements showed that the single nanowires doped with manganese and potassium had resistivities of 1.81×0−5 Ω· and 1.93×10−5 Ω·m, respectively. The doping contributed to the phase transition from monoclinic to metastable hexagonal for the tungsten oxide nanowires, the structure of which is known for its hexagonal electron channels. The hexagonal structure provided efficient charge transfer and enhanced the catalytic efficiency of the tungsten oxide nanowires, resulting in a catalytic efficiency of 98.5% for the manganese-doped tungsten oxide nanowires and 97.73% for the potassium-doped tungsten oxide nanowires after four hours of degradation of methylene blue. Additionally, the gas sensing response for 20 ppm of ethanol showed a positive dependence of doping with the manganese-doped and potassium-doped responses being 14.4% and 29.7%, respectively, higher than the pure response at 250 °C. The manganese-doped and potassium-doped tungsten oxide nanowires are attractive candidates in gas sensing, photocatalytic, and energy storage applications, including water splitting, photochromism, and rechargeable batteries.

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Section: Introductionmentioning

confidence: 99%

Chemical Vapor Deposition-Fabricated Manganese-Doped and Potassium-Doped Hexagonal Tungsten Trioxide Nanowires with Enhanced Gas Sensing and Photocatalytic Properties

Chen

Yang

et al. 2022

Nanomaterials

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“…During the studies into these growth methods, nanoscale metal oxides were discovered. These nanoscale materials have been widely studied since the electronic characteristics of nanoscale materials are different from those of bulk-scale materials [ 1 - 5 ]. In particular, metal oxides with nanorod structures were studied because they have a one-dimensional structure and are thus able to be applied for electrical components such as nanoscale wires.…”

Section: Introductionmentioning

confidence: 99%

Growth and structure analysis of tungsten oxide nanorods using environmental TEM

et al. 2012

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WO3 nanorods targeted for applications in electric devices were grown from a tungsten wire heated in an oxygen atmosphere inside an environmental transmission electron microscope, which allowed the growth process to be observed to reveal the growth mechanism of the WO3 nanorods. The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten. The formed crystal tungsten nanorods were then oxidized, resulting in the formation of the tungsten oxide nanorods. Furthermore, it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire.

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“…In addition, WO 3 square platelets with smooth surfaces have also been synthesized by an organic acid-assisted hydrothermal process [18], and WO 3 ·H 2 O square platelets have been obtained via low temperature hydrothermal treatment [19]. A few groups have reported the synthesis of WO 3−x networks, such as, three-dimensional tungsten oxide nanowire networks growing on a substrate by Zhou et al [20], Chi et al [21] and Li et al [22] via thermal evaporation/vapor deposition at temperature of 750-1450 • C, and two-dimensional tungsten oxide nanowire networks obtained by Zhao et al via thermally evaporating a WS 2 powder under a controlled moist atmosphere at temperature of 1400-1500 • C [23]. However, hierarchical networks in separate squares of WO 3−x have not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Preparation of WO3 network squares for ultrasensitive photodetectors

Yang

et al. 2011

Journal of Alloys and Compounds

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A study of control growth of three-dimensional nanowire networks of tungsten oxides: From aligned nanowires through hybrid nanostructures to 3D networks

Cited by 21 publications

References 22 publications

Chemical Vapor Deposition-Fabricated Manganese-Doped and Potassium-Doped Hexagonal Tungsten Trioxide Nanowires with Enhanced Gas Sensing and Photocatalytic Properties

Chemical Vapor Deposition-Fabricated Manganese-Doped and Potassium-Doped Hexagonal Tungsten Trioxide Nanowires with Enhanced Gas Sensing and Photocatalytic Properties

Growth and structure analysis of tungsten oxide nanorods using environmental TEM

Preparation of WO3 network squares for ultrasensitive photodetectors

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