Preparation of polycrystalline tungsten nanofibers by needleless electrospinning

Kundrát, Vojtěch; Vykoukal, Vít; Moravec, Zdeněk; Šimoníková, Lucie; Novotný, Karel; Pinkas, Jiří

doi:10.1016/j.jallcom.2021.163542

Cited by 13 publications

(15 citation statements)

References 73 publications

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“…The W 18 O 49 nanowhiskers grew from the γ-WO 3 / a -SiO 2 nanofibers via the transport of volatile tungsten species (conceivably WO 2 (OH) 2 ) . Previously, the high-temperature reduction of γ-WO 3 / a -SiO 2 nanofibers at atmospheric pressure resulted in metallic tungsten nanoparticles interconnected by amorphous silica to the nanofibrous structure . In the present study, we observed the W 18 O 49 nanowhisker’s growth under the low-pressure hydrogen atmosphere, while the amorphous silica remained chemically intact in the nanofiber.…”

Section: Resultssupporting

confidence: 58%

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W₁₈O₄₉ Nanowhiskers Decorating SiO₂ Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

Kundrat,

Bukvisova,

Novak

et al. 2023

Crystal Growth & Design

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Tungsten suboxide W 18 O 49 nanowhiskers are a material of great interest due to their potential high-end applications in electronics, near-infrared light shielding, catalysis, and gas sensing. The present study introduces three main approaches for the fundamental understanding of W 18 O 49 nanowhisker growth and structure. First, W 18 O 49 nanowhiskers were grown from γ-WO 3 /a-SiO 2 nanofibers in situ in a scanning electron microscope (SEM) utilizing a specially designed microreactor (μReactor). It was found that irradiation by the electron beam slows the growth kinetics of the W 18 O 49 nanowhisker, markedly. Following this, an in situ TEM study led to some new fundamental understanding of the growth mode of the crystal shear planes in the W 18 O 49 nanowhisker and the formation of a domain (bundle) structure. High-resolution scanning transmission electron microscopy analysis of a crosssectioned W 18 O 49 nanowhisker revealed the well-documented pentagonal Magneĺi columns and hexagonal channel characteristics for this phase. Furthermore, a highly crystalline and oriented domain structure and previously unreported mixed structural arrangement of tungsten oxide polyhedrons were analyzed. The tungsten oxide phases found in the cross section of the W 18 O 49 nanowhisker were analyzed by nanodiffraction and electron energy loss spectroscopy (EELS), which were discussed and compared in light of theoretical calculations based on the density functional theory method. Finally, the knowledge gained from the in situ SEM and TEM experiments was valorized in developing a multigram synthesis of W 18 O 49 /a-SiO 2 urchin-like nanofibers in a flow reactor.

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Section: Resultssupporting

confidence: 58%

“…Recently, we have described a multigram preparation of tungsten trioxide/amorphous silica (for brevity γ-WO 3 /a-SiO 2 ) fibers, which served as a precursor material for the preparation of polycrystalline tungsten metal nanofibers 41 and WS 2 microfibers. 42 In both cases, amorphous SiO 2 acted as a binder of the material nanograins.…”

Section: Introductionmentioning

confidence: 99%

W₁₈O₄₉ Nanowhiskers Decorating SiO₂ Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

Kundrat,

Bukvisova,

Novak

et al. 2023

Crystal Growth & Design

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“…15,16 Due to the high hardness of TMCs, it is difficult to refine them into nanoscale by traditional means such as ball milling, so the large-scale preparation of nanosized TMCs remains a challenge. 17 For metal NWs, fibers synthesized by the hydrothermal method usually need to be calcined subsequently 18,19 ; the electrospinning method usually produces polycrystalline fibers 20 ; and the sol-gel method has cumbersome reaction steps and long preparation cycle. 21,22 In addition, the common metal NWs are usually noble metals, such as silver and gold.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale preparation of nano‐sized carbides and metal whiskers via mechanochemical decomposition of MAX phases

Tian

Tang

et al. 2022

Int J Applied Ceramic Tech

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Nano-sized transition metal carbide powder is usually synthesized by chemical methods such as chemical vapor deposition, while its large-scale synthesis is a long-standing challenge due to high energy consumption and low yield; metal nanowires (NWs) (mainly noble metals) are usually prepared by wet chemistry, and more compositions and greener preparation routes for metal NWs are urgent to meet the needs of the high technology industry. Herein, MAX phases are mechanochemically decomposed, resulting in the fine corresponding binary M-X carbides and the A-site metal whiskers. This implies a feasible top-down route for efficiently preparing fine carbides and high-quality metal whiskers on large scale. Several example MAX phases (both 312 and 211) are selected to demonstrate the feasibility of this method. The carbides and metal whiskers are characterized by X-ray diffractometer, scanning electron microscope, transmission electron microscopy, and energy-dispersive X-ray spectroscopy to identify their morphology, composition, and phase. The compositional diversity of MAX phases bodes that this would be a promising alternative avenue to preparing various nano-sized carbides and single-crystal metal whiskers.

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“…However only a few researchers made some attempts on fabrication of potential radiation shields via electrospinning technique [26–30] . The type of filler used in polymer matrix has crucial effect on radiation shielding efficiency of electrospun surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…[24][25] However only a few researchers made some attempts on fabrication of potential radiation shields via electrospinning technique. [26][27][28][29][30] The type of filler used in polymer matrix has crucial effect on radiation shielding efficiency of electrospun surfaces. It was reported that Bi 2 O 3 doped mats had higher Xray attenuation ability than WO 3 doped samples in same polymer matrix and WO 3 concentration should be higher for reaching similar radiation shielding efficiency.…”

Section: Introductionmentioning

confidence: 99%

X‐Ray Shielding Performance and Characterization of Electrospun PVC/Bismuth(III) Oxide Nanocomposites

Alma

Aygün

2022

ChemistrySelect

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To develop an alternative surface to lead‐based shieldings, we synthesized bismuth(III) oxide‐free and bismuth(III) oxide‐loaded poly(vinyl) chloride solutions via electrospinning process. Nanocomposite surfaces were characterized by scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis and fourier transform infrared spectroscopy. Thickness and electrical conductivity of different samples were measured and linear attenuation coefficients, half‐value length, tenth‐value length, mean‐free path and shielding performance were calculated with corresponding formula. The attenuation behaviors of samples were plotted by X‐COM software. According to results of instrumental analysis, micro‐particulated bismuth(III) oxide powder was adapted into nanofibrous structures and bismuth(III) oxide loading lead to development on thermal behaviors. Besides, bismuth(III) oxide‐loaded poly(vinyl) chloride samples showed limited electrical conductivity and improved X‐ray radiation attenuation. Increasing weight percentage of bismuth(III) oxide caused a decrease on half‐value length, tenth‐value length and mean‐free path values. It was concluded that studied samples should be used as multi‐layer form for achieving desired radiation dose reduction. By increasing w% of bismuth(III) oxide powder, more effective surfaces for radiation shielding can be manufactured.

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Preparation of polycrystalline tungsten nanofibers by needleless electrospinning

Cited by 13 publications

References 73 publications

W₁₈O₄₉ Nanowhiskers Decorating SiO₂ Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

W₁₈O₄₉ Nanowhiskers Decorating SiO₂ Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

Large‐scale preparation of nano‐sized carbides and metal whiskers via mechanochemical decomposition of MAX phases

X‐Ray Shielding Performance and Characterization of Electrospun PVC/Bismuth(III) Oxide Nanocomposites

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Preparation of polycrystalline tungsten nanofibers by needleless electrospinning

Cited by 13 publications

References 73 publications

W18O49 Nanowhiskers Decorating SiO2 Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

W18O49 Nanowhiskers Decorating SiO2 Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

Large‐scale preparation of nano‐sized carbides and metal whiskers via mechanochemical decomposition of MAX phases

X‐Ray Shielding Performance and Characterization of Electrospun PVC/Bismuth(III) Oxide Nanocomposites

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W₁₈O₄₉ Nanowhiskers Decorating SiO₂ Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding

W₁₈O₄₉ Nanowhiskers Decorating SiO₂ Nanofibers: Lessons from In Situ SEM/TEM Growth to Large Scale Synthesis and Fundamental Structural Understanding