Improving the field emission of carbon nanotubes by lanthanum-hexaboride nano-particles decoration

Kumari, Monika; Gautam, Seema; Shah, Preeti V.; Pal, Surendra; Ojha, Umaprasana; Kumar, Avinash; Naik, Akshay; Rawat, J. S.; Chaudhury, P. K.; Harsh,; Tandon, R. P.

doi:10.1063/1.4754110

Cited by 29 publications

(11 citation statements)

References 17 publications

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“…7 shows field emission measurement results on the samples A, B and C respectively. It is known form the previous works [15,18,39,40] that field emission from CNTs is governed by Fowler-Nordheim (F-N) equation as given below [39][40][41].…”

Section: Field Emission Measurementmentioning

confidence: 99%

Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes

Kar

Sarkar

Basak

et al. 2015

Carbon

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Section: Field Emission Measurementmentioning

confidence: 99%

Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes

Kar

Sarkar

Basak

et al. 2015

Carbon

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“…The Ohmic contact and the two‐stage field enhancement together increase the overall field emission performance. A few more recent studies in this domain are cited here and some significant studies are listed in Table .…”

Section: Enhancement (Sources)mentioning

confidence: 99%

Electron Emission Devices for Energy‐Efficient Systems

Nirantar

Ahmed

Bhaskaran

et al. 2019

Advanced Intelligent Systems

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Artificial intelligence platforms, high-speed computation, and data handling systems increasingly need energy-efficient systems. Electron emission was fundamental to the development of transistors and electronics over seven decades ago. This technology has a renewed emergence and includes implications in diverse fields ranging from electronics, telecommunication, defense, space exploration, medical science, and material science to televisions and displays. For such a vital field, a critical review of theories, current research directions, applications, and future prospects is invaluable. Herein, the ongoing research directions adopted to enhance the emitter performance are reviewed and the relative degree of their success is compared. This is supported by an overview of key electron emission, transport mechanisms, and ways to tune a particular mechanism for energy-efficient applications. The diverse range of applications in this field, with a particular focus on electronics, is outlined. Exciting current developments in electron field emission that could revolutionize the electronic industry with a resurgence of nanoscale field emission transistor in the air medium are also discussed. Figure 2. Representation of different electron emission mechanisms: a) Comparison of thermionic emission, Schottky emission, FN tunnelling, and direct tunnelling with schematic energy band diagram. b) Typical thermionic emission plot. c) Typical Schottky plot. (b,c)Reproduced with permission. [3]

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“…A cold field emitter (CFE) offers the highest brightness and temporal coherence over other types of electron sources, such as the Schottky emitter and the thermionic emitter. Because of their high melting point, mechanical strength, chemical stability, low work function, and stable specific resistance, 4,5 rare earth hexaborides like lanthanum hexaboride (LaB 6 ) and cerium hexaboride (CeB 6 ) were identified as the most promising electron source materials [6][7][8][9][10][11] for many small spot size applications such as surface analysis and metrology as well as high current applications such as microwave tubes, electron beam lithography, electron beam welders, X-ray sources, and free electron lasers. In addition, rare earth hexaborides can work at low operational temperature and have a long service life when used as a cathode material.…”

Section: Introductionmentioning

confidence: 99%

Enhanced field emission from cerium hexaboride coated multiwalled carbon nanotube composite films: A potential material for next generation electron sources

Patra

Ghosh

Sheremet

et al. 2014

Journal of Applied Physics

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Intensified field emission (FE) current from temporally stable cerium hexaboride (CeB 6) coated carbon nanotubes (CNTs) on Si substrate is reported aiming to propose the new composite material as a potential candidate for future generation electron sources. The film was synthesized by a combination of chemical and physical deposition processes. A remarkable increase in maximum current density, field enhancement factor, and a reduction in turn-on field and threshold field with comparable temporal current stability are observed in CeB 6-coated CNT film when compared to pristine CeB 6 film. The elemental composition and surface morphology of the films, as examined by scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray measurements, show decoration of CeB 6 nanoparticles on top and walls of CNTs. Chemical functionalization of CNTs by the incorporation of CeB 6 nanoparticles is evident by a remarkable increase in intensity of the 2D band in Raman spectrum of coated films as compared to pristine CeB 6 films. The enhanced FE properties of the CeB 6 coated CNT films are correlated to the microstructure of the films. V

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Improving the field emission of carbon nanotubes by lanthanum-hexaboride nano-particles decoration

Cited by 29 publications

References 17 publications

Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes

Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes

Electron Emission Devices for Energy‐Efficient Systems

Enhanced field emission from cerium hexaboride coated multiwalled carbon nanotube composite films: A potential material for next generation electron sources

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