Radial AlN nanotips on carbon fibers as flexible electron emitters

Chen, Fei; Ji, Xiaohong; Zhang, Qinyuan

doi:10.1016/j.carbon.2014.09.037

Cited by 14 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the demonstration of a GaN nanorod ensemble on flexible foils for device application is important to advance the development of futuristic GaN-based flexible and wearable devices. Previously, Chen et al reported the radial AlN nanotip-based flexible electron emitter grown on carbon cloth by the chemical vapor deposition process . Here, the Ta metal foil substrate has unique advantages over carbon cloth like good mechanical strength, which can be beneficial to withstand mechanical stress or pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, Chen et al reported the radial AlN nanotip-based flexible electron emitter grown on carbon cloth by the chemical vapor deposition process. 16 Here, the Ta metal foil substrate has unique advantages over carbon cloth like good mechanical strength, which can be beneficial to withstand mechanical stress or pressure. Also, the Ta metal exhibits lower outgassing properties, making it suitable for vacuum applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Role of Surface Chemistry of Ta Metal Foil on the Growth of GaN Nanorods by Laser Molecular Beam Epitaxy and Their Field Emission Characteristics

Pradhan,

Tyagi,

Pal

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

This study investigates the influence of surface nitridation of Ta metal foil substrates on the growth of GaN nanorods using the laser molecular beam epitaxy (LMBE) technique and the field emission characteristics of the grown GaN nanorod ensemble. Surface morphology examinations underscore the pivotal role of Ta foil nitridation in shaping the dimensions and densities of GaN nanorods. Bare Ta foil fosters the formation of high-density, vertically self-aligned GaN nanorods at a growth temperature of 700 °C. Furthermore, the density of these nanorods is directly related to the duration of Ta foil nitridation, with increased duration leading to a reduced nanorod density. X-ray Photoelectron Spectroscopy (XPS) studies reveal that the transition of the Ta foil surface from tantalum oxide to tantalum nitride during nitridation emerges as a crucial factor influencing GaN nanorod growth. Photoluminescence (PL) spectroscopy at ambient temperature reveals a strong near-band-edge (NBE) emission peak with negligible defect-related peaks, displaying the high optical quality of the GaN nanorods. The highly dense vertically aligned GaN nanorod ensemble growth without Ta prenitridation exhibits the most favorable field emission performance, featuring a turn-on field of 2.1 V/μm, a field enhancement factor of 2480, and a stable long-term operation at the emission current density of 2.26 mA/cm2. This study advances the understanding of the role of the surface chemistry of metal foil in determining GaN nanorod growth and opens up exciting possibilities for tailoring advanced optoelectronic devices for specific application requirements.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of Surface Chemistry of Ta Metal Foil on the Growth of GaN Nanorods by Laser Molecular Beam Epitaxy and Their Field Emission Characteristics

Pradhan,

Tyagi,

Pal

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…CNTs have been considered promising field emission candidates since they were first demonstrated as electron field emitters in 1995 [10][11][12]. These years, considerable researches have been conducted on their useful properties, as well as synthesis methods and various applications [13].…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes as a Pulsed Electron Sources

Wei¹

2018

Carbon Nanotubes - Recent Progress

View full text Add to dashboard Cite

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.

show abstract

“…It has good chemical stability and high hardness and is used in various structure refractory composite applications. AlN also leads to an increase in critical thermal shock [29,30]. A common characteristic of various AlN composites is their utility as thermal conducting filler in electronic industries.…”

Section: Introductionmentioning

confidence: 99%

Studies on Preparation and Characterization of Aluminum Nitride-Coated Carbon Fibers and Thermal Conductivity of Epoxy Matrix Composites

Kim

Lee

Chung³

et al. 2017

Coatings

View full text Add to dashboard Cite

Abstract:In this work; the effects of an aluminum nitride (AlN) ceramic coating on the thermal conductivity of carbon fiber-reinforced composites were studied. AlN were synthesized by a wet-thermal treatment (WTT) method in the presence of copper catalysts. The WTT method was carried out in a horizontal tube furnace at above 1500 • C under an ammonia (NH 3 ) gas atmosphere balanced by a nitrogen using aluminum chloride as a precursor. Copper catalysts pre-doped enhance the interfacial bonding of the AlN with the carbon fiber surfaces. They also help to introduce AlN bonds by interrupting aluminum oxide (Al 2 O 3 ) formation in combination with oxygen. Scanning electron microscopy (SEM); Transmission electron microscopy (TEM); and X-ray diffraction (XRD) were used to analyze the carbon fiber surfaces and structures at each step (copper-coating step and AlN formation step). In conclusion; we have demonstrated a synthesis route for preparing an AlN coating on the carbon fiber surfaces in the presence of a metallic catalyst.

show abstract

Radial AlN nanotips on carbon fibers as flexible electron emitters

Cited by 14 publications

References 29 publications

Role of Surface Chemistry of Ta Metal Foil on the Growth of GaN Nanorods by Laser Molecular Beam Epitaxy and Their Field Emission Characteristics

Role of Surface Chemistry of Ta Metal Foil on the Growth of GaN Nanorods by Laser Molecular Beam Epitaxy and Their Field Emission Characteristics

Carbon Nanotubes as a Pulsed Electron Sources

Studies on Preparation and Characterization of Aluminum Nitride-Coated Carbon Fibers and Thermal Conductivity of Epoxy Matrix Composites

Contact Info

Product

Resources

About