A modulated field emission from carbon nanotubes cold cathode cavity resonator in L band frequency

Based on the classical electrostatic theory, the distributions of potential and electrical field at the apex of the carbon nanotubes (CNTs), both in normal-gate type triode structure and under-gate type triode structure, were simulated and calculated respectively. The gate electrode's position and gate aperture's effect on CNTs' field emission characteristics were analyzed. The results indicate that under-gate structure, compared with normal-gate structure, has better field emission performance and lower threshold voltage. Both the gate aperture and the distance between gate electrode and CNTs' apex have crucial effect on field enhancement factors of normal-gate structure and under-gate structure.

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In-Situ Grown ZnS Nanoparticles on Amorphous Carbon Nanotubes Improved Cold Cathode Emission and Photoluminescence

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18124 ◽

2020 ◽

Vol 20 (12) ◽

pp. 7686-7693

Author(s):

Arunava Jha ◽

Sudipta Kumar Sarkar ◽

Kalyan Kumar Chattopadhyay

Keyword(s):

Carbon Nanotubes ◽

Field Emission ◽

Amorphous Carbon ◽

Hybrid Material ◽

Potential Candidate ◽

Photoluminescence Intensity ◽

Cold Cathode ◽

Zns Nanoparticles ◽

Field Emitter

The current work reveals notable increase in field emission and photoluminescence characteristics of amorphous carbon nanotubes after forming its composite with In-Situ grown zinc sulfide (ZnS) nanoparticles. An easy chemical technique was employed to synthesize amorphous carbon nanotubes (ACNTs) and then ZnS nanoparticles were grown on them through an In-Situ solvothermal process. The morphology of the ZnS-ACNTs hybrid material was investigated through scanning electron microscope. Photoluminescence and field emission studies of the material were carried out as well in order to realize the applications. Substantial increase in photoluminescence intensity was found for ZnS-ACNTs hybrid material in comparison with pure amorphous carbon nanotubes, the hybrid also turned out as a better field-emitter than pure amorphous carbon nanotubes. Turnon field for ZnS-ACNTs composite decreased to 6 Vμm−1 which was 8 Vμm−1 in case of pure amorphous carbon nanotubes. A simulation analysis following finite element modelling method was carried out which ensured the improvement as field emitter for amorphous carbon nanotubes after ZnS nanoparticles were grown on them. Altogether the hybrid material proved to be a potential candidate for luminescent and cold cathode applications.

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Field-emission fluorescent lamp using carbon nanotubes on a wire-type cold cathode and a reflecting anode

Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena ◽

10.1116/1.2970144 ◽

2008 ◽

Vol 26 (5) ◽

pp. 1700 ◽

Cited By ~ 15

Author(s):

J. X. Huang ◽

Jun Chen ◽

S. Z. Deng ◽

J. C. She ◽

N. S. Xu

Keyword(s):

Carbon Nanotubes ◽

Field Emission ◽

Cold Cathode ◽

Fluorescent Lamp

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Design and Realization of Microwave Frequency Multiplier Based on Field Emission From Carbon Nanotubes Cold-Cathode

IEEE Transactions on Electron Devices ◽

10.1109/ted.2018.2793909 ◽

2018 ◽

Vol 65 (3) ◽

pp. 1146-1150 ◽

Cited By ~ 5

Author(s):

Yang Xing ◽

Yu Zhang ◽

Ningsheng Xu ◽

Haijie Huang ◽

Yanlin Ke ◽

...

Keyword(s):

Carbon Nanotubes ◽

Field Emission ◽

Microwave Frequency ◽

Frequency Multiplier ◽

Cold Cathode

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Development of a conical anode Fe-gun for low voltage SEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100106958 ◽

1988 ◽

Vol 46 ◽

pp. 978-979

Author(s):

T. Miyokawa ◽

S. Norioka ◽

S. Goto

Keyword(s):

High Resolution ◽

Field Emission ◽

Low Voltage ◽

Irradiation Damage ◽

Cold Cathode ◽

Virtual Source ◽

Source Position ◽

Electrostatic Lens ◽

Electrostatic Lenses ◽

Wide Range

Field emission SEMs (FE-SEMs) are becoming popular due to their high resolution needs. In the field of semiconductor product, it is demanded to use the low accelerating voltage FE-SEM to avoid the electron irradiation damage and the electron charging up on samples. However the accelerating voltage of usual SEM with FE-gun is limited until 1 kV, which is not enough small for the present demands, because the virtual source goes far from the tip in lower accelerating voltages. This virtual source position depends on the shape of the electrostatic lens. So, we investigated several types of electrostatic lenses to be applicable to the lower accelerating voltage. In the result, it is found a field emission gun with a conical anode is effectively applied for a wide range of low accelerating voltages.A field emission gun usually consists of a field emission tip (cold cathode) and the Butler type electrostatic lens.

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