Single-crystalline hafnium carbide nanowire growth below the eutectic temperature by CVD

Tian, Shou‐Fu; Li, Hejun; Zhang, Yulei; Zhang, Shouyang; Wang, Yongjie; Ren, Jihong; Xia, Qiang

doi:10.1016/j.jcrysgro.2013.09.016

Cited by 29 publications

(20 citation statements)

References 26 publications

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“…For example, the growth direction of a VLS‐grown nanowire is believed to be closely related to the pressure and temperature of the synthetic environment . In addition, the diameter of nanowire is also sensitive to the synthesis temperature . Therefore, to synthesize HfC nanowires with a uniform morphology, high aspect ratio, high purity, and high crystallinity, in this study, we investigated the synthesis parameters, including the amount of HfCl 4 , synthesis temperature, and flow rate of CH 4 on the resultant morphology of the HfC nanowires.…”

Section: Introductionmentioning

confidence: 99%

Growth and Field Emission of Single‐Crystalline Hafnium Carbide Nanowires

Chiu

Tang

et al. 2020

Physica Status Solidi (a)

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<100>-oriented hafnium carbide (Hf C) nanowires are synthesized on the graphite substrate by chemical vapor deposition. The dependence of temperature, Hf Cl 4 content, and flow rate of CH 4 gas on the morphology of nanowires is investigated herein. The results indicate that the Hf C nanowire often kinks to another growth direction at a high Hf Cl 4 content or a low temperature due to the destabilization of the catalyst droplet induced by either a faster growth rate or slower thermal activation. Reduced nanowire density and length are observed at the sample synthesized at a lower CH 4 flow rate. Based on the experimental results, high-crystallinity nanowires with high aspect ratios and high densities are prepared at a lower Hf Cl 4 content, higher temperature, and high CH 4 flow rate. The field-emission properties of a single Hf C nanowire are also characterized by assembling a single Hf C nanowire emitter. An extremely high field enhancement factor of 5.57 Â 10 6 m À1 is obtained herein.

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Section: Introductionmentioning

confidence: 99%

Growth and Field Emission of Single‐Crystalline Hafnium Carbide Nanowires

Chiu

Tang

et al. 2020

Physica Status Solidi (a)

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“…In the formation of alloy droplet stage, Ni would act as nucleation point and absorb Hf and C atoms to form Ni–C–Hf alloy around 1100°C …”

Section: Resultsmentioning

confidence: 99%

Large‐scale synthesis of hafnium carbide nanowires via a Ni‐assisted polymer infiltration and pyrolysis

Zhang

Ren

et al. 2018

J Am Ceram Soc

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Hafnium carbide (HfC) nanowires were successfully synthesized on C/C composites via a Ni-assisted polymer infiltration and pyrolysis. Before synthesizing HfC nanowires, the composition and microstructure of the organic HfC precursor and its pyrolyzed products were characterized by Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and X-ray diffraction. The effect of heat-treatment temperature on the morphology and microstructure of HfC nanowires were investigated by scanning electron microscopy and transmission electron microscopy. Results show that HfC nanowires exhibits three-layer core-shell structure, including HfC core, HfO 2 inner shell (~2 nm) and carbon nanosheet outer shell (~1 nm). The obtained HfC nanowire is typically grown along <01 1> with the diameters of~100 nm and the length of several micrometers. The growth of HfC nanowire follows the combination of top-type vapor-liquid-solid and solid-liquidsolid mechanism. K E Y W O R D SHfC nanowires, Ni-assisted, pyrolysis of polymeric precursors, VLS and SLS mechanism

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“…Since HfC whiskers were first synthesized by chemical vapor deposition (CVD), polycrystalline cubic HfC nanofibers have been roughly synthesized by CNT‐templated reactions . Subsquently, different morphologies and field emission properties of 1D HfC‐like nanorods, nanowires, nanotubes, and nanobelts were fabricated by CVD in detail . The preparation methods of 1D HfC are limited until the polymer infiltration and the pyrolysis route was proposed in our previous work .…”

Section: Introductionmentioning

confidence: 99%

“…13 Subsquently, different morphologies and field emission properties of 1D HfC-like nanorods, nanowires, nanotubes, and nanobelts were fabricated by CVD in detail. 10,11,14,15 The preparation methods of 1D HfC are limited until the polymer infiltration and the pyrolysis route was proposed in our previous work. 16,17 However, it is worth noting that Ni particles were used as the catalyst in the reported methods.…”

Section: Introductionmentioning

confidence: 99%

Awl‐like HfC nanowires grown on carbon cloth via Fe‐catalyzed in a polymer pyrolysis route

Zhang

Yin

et al. 2020

J Am Ceram Soc

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Awl‐like hafnium carbide (HfC) nanowires were successfully synthesized on carbon cloth in a polymer pyrolysis route via Fe‐catalyzed for the first time. A detailed study of the HfC nanowire morphology was performed. X‐ray diffraction, scanning electron microscopy and transmission electron microscopy were used to investigate the morphology and microstructure of the obtained awl‐like HfC nanowires and the growth mechanism was also discussed in detail. Results show that HfC nanowires wrapped by amorphous HfO2 layer with ~10 nm in thickness display awl‐like structure and the nanowire's surface exhibit prismatic geometry. The diameter of the nanowire decreases from the bottom (~500 nm) to the top (~100 nm). The growth mechanism of the awl‐like HfC nanowires was mainly affected by the combination of bottom‐type vapor‐liquid‐solid (VLS) and solid‐liquid‐solid.

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Single-crystalline hafnium carbide nanowire growth below the eutectic temperature by CVD

Cited by 29 publications

References 26 publications

Growth and Field Emission of Single‐Crystalline Hafnium Carbide Nanowires

Growth and Field Emission of Single‐Crystalline Hafnium Carbide Nanowires

Large‐scale synthesis of hafnium carbide nanowires via a Ni‐assisted polymer infiltration and pyrolysis

Awl‐like HfC nanowires grown on carbon cloth via Fe‐catalyzed in a polymer pyrolysis route

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