Potential field emitters: HfC nanorods sheathed with a HfO2 nanoshell

Tian, Shou‐Fu; Li, Hejun; Zhang, Yulei; Ren, Jihong; Li, Yixian; Xu, Zhanwei; Xia, Qiang; Zhang, Shouyang

doi:10.1039/c3ce42478b

Cited by 11 publications

(11 citation statements)

References 32 publications

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“…For example, the electrical conductivity is about 10 5 S/cm and thermal conductivity is 3500 W/mK, which is better than that of many metallic emitters [15,16]. Graphene, a desired electrical and thermal transport medium with two-dimensional sp 2 hybridized carbon atoms, is potential for field emission because of its remarkable electronic, mechanical, and thermal properties. However, the CNTs emitters are commonly attached onto the electrode surface to form the CNTs cathodes, resulting in a large contact resistance and unstable emission current.…”

Section: Carbon Nanotubes Arrays-graphene Composite (Cnts-g)mentioning

confidence: 99%

“…One of the most promising applications of the field emission is an electron source. Lots of electronic devices are based on electron sources, which are the most crucial component served as state-of-art vacuum nanoelectronics and emerging novel devices in nowadays, such as field emission displays, emerging sensor, energy storage equipment, scanning ultrafast electron microscopes, X-ray generators, free electron lasers (FELs), THz sources, and so on [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Carbon Nanotubes as a Pulsed Electron Sources

Wei¹

2018

Carbon Nanotubes - Recent Progress

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One of the most promising applications of carbon nanotubes (CNTs) is the emission electronics, in which CNTs are used as a field emission electron source. Lots of electronic devices are based on electron sources, which are the most important components served as state-of-art nanoelectronics devices in nowadays, such as field emission displays, miniature mass spectrometers, scanning ultrafast electron microscopes, X-ray generators, free electron lasers, THz sources, and so on. Field electron emission is based on the physical phenomenon of quantum tunneling, in which electrons are emitted from the surface of materials into vacuum on the condition of applied voltage. CNTs have many advantages as field emitters comparing with conventional metallic emitters like familiar examples of tungsten, gold, copper, and molybdenum. Electron emission from cold cathodes of CNTs has attracted attentions of numerous scientists, and substantial researches have been conducted on their properties and applications. In this chapter, we will focus on the field emission of CNT cold cathodes as an electron source, including of how to synthesize it by chemical vapor deposition (CVD) method and how to realize its electron emission. In addition, we will report pulsed electron emission of CNT cathodes. The combination of the laser pulse and the cold cathode will offer the possibility of pulsed field emission. Our approach demonstrates the growth mechanism and the emission mechanism of CNTs, which is beneficial for controlling the performance of its fascinating application on emerging fields.

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Section: Carbon Nanotubes Arrays-graphene Composite (Cnts-g)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes as a Pulsed Electron Sources

Wei¹

2018

Carbon Nanotubes - Recent Progress

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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%

“…6,7 Thus, HfC nanowires exhibit both excellent properties of bulk materials and unique properties of 1D nanostructures, which have proved to be toughening materials for ultra-high ceramics coatings, as well as the potential materials for field emitters. [8][9][10][11] Since HfC whiskers were first synthesized by chemical vapor deposition (CVD), 12 polycrystalline cubic HfC nanofibers have been roughly synthesized by CNT-templated reactions. 13 Subsquently, different morphologies and field emission properties of 1D HfC-like nanorods, nanowires, nanotubes, and nanobelts were fabricated by CVD in detail.…”

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%

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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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Recent Progress in 1D Nanostructures Reinforced Carbon/Carbon Composites

Yin

Han

Liu

et al. 2022

Adv Funct Materials

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Carbon fiber reinforced carbon matrix (carbon/carbon, C/C) composites have become the promising candidates for high‐temperature thermal structure materials in aerospace fields, owning to a series of excellent structural merits. However, for aculeate or thin‐walled C/C composites, due to the fact that continuous carbon fibers are cut off during the machining process and the amount of residual carbon fibers is limited, carbon matrix cannot be effectively strengthened just by using carbon fibers, resulting in a sharp decline in mechanical performance. Furthermore, the rapid development of aerospace vehicles requires that C/C composites not only have excellent mechanical properties but also possess multifunctional properties. To effectively solve these problems and meet the increasing demands, various 1D nanostructures as nanoreinforcements have been introduced into C/C composites, achieving the great improvement in mechanical and functional properties. In this review, the state‐of‐the‐art research activities regarding different 1D nanoreinforcements applied in C/C composites are systematically summarized. Finally, this review is concluded and the future research prospects are proposed. This review provides the “1D nanoreinforcements” strategy to further improve the properties of C/C composites, which could be widely used for reference by researchers in the fields of different fiber/matrix composites.

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Potential field emitters: HfC nanorods sheathed with a HfO2 nanoshell

Cited by 11 publications

References 32 publications

Carbon Nanotubes as a Pulsed Electron Sources

Carbon Nanotubes as a Pulsed Electron Sources

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

Recent Progress in 1D Nanostructures Reinforced Carbon/Carbon Composites

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