Nanotube Carbon Structure Tips - A Source of High Field Emission of Electrons

1994 ◽  
Vol 359 ◽  
Author(s):  
Leonid A. Chernozatonskii ◽  
Yu.V. Gulyaev ◽  
Z.Ja. Kosakoyskaja ◽  
N.I. Sinitsyn ◽  
G.V. Torgashov ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Emission ◽  
Quartz Glass ◽  
High Field ◽  
Emission Current ◽  
Carbon Structure ◽  
Glass Density ◽  
And Inversion ◽  
Field Emission Of Electrons

ABSTRACTWe present the finding of experiments of considerable field emission from the films consisting of nanotube carbon structureson various substrates (Si, quartz, glass): density of emission current was up to 1-3 A/cm2 while electric field was about 100 V/μ. The “reconstruction” and “inversion” of field emission have also been observed after current breakdown.

Electron Field Emission from Nano-Diamond Films

2001 ◽  
Vol 704 ◽  
Author(s):  
S.G. Wang ◽  
Q. Zhang ◽  
S.F. Yoon ◽  
J. Ahn ◽  
Q. Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Electric Field ◽  
Field Emission ◽  
Current Density ◽  
Diamond Films ◽  
Emission Current Density ◽  
Hydrogen Gas ◽  
Emission Current ◽  
Electron Field Emission ◽  
Electron Field

AbstractIn this paper, the field emission properties of nano-diamond films were investigated by measuring the curves of emission current density (J) versus applied electric field (E). The nano-diamond films were prepared on n-type (100) silicon substrate by microwave plasma enhanced chemical vapor deposition (MPECVD) technique using a gas mixture of nitrogen-methane-hydrogen. Field emission results show that, with increasing hydrogen gas flow ratio of [H2]/[N2+CH4+H2] from 0 to 10 %, diamond grain size increases from 5 to 60 nm, threshold electric field for electron field emission increases from 1.2 to 5.75 V/μm, and emission current density decreases from 820 to 560 μA/cm2, demonstrating that small grain size nano-diamond films are promising as a cathode material for low-field electron emitters.

Influence of Cathode Size on Field Emission Properties of a Single Vertical Carbon Nanotube Material

2016 ◽  
Vol 723 ◽  
pp. 454-458 ◽  
Author(s):  
Li Guo Jing ◽  
He Qiu Zhang ◽  
Yu Qiu ◽  
Bing Yin ◽  
Li Zhong Hu
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Field Emission ◽  
Emission Current ◽  
Perfect Conductor ◽  
Current Increase ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Current ◽  
Constant Potential

In this work, we study the field emission properties of a single vertical carbon nanotube with cathode radius changing. The carbon nanotube is considered as purely perfect conductor, and the anode and cathode are modeled as discs. The radius of anode is kept as 24m, then the radius of cathode is changed from 24 m to 1 m. The emitter of that CNT consists of a hemispherical cap of 4 nm radius (r) on top of a cylinder height of 2 m (h). The distance from anode to cathode is w=h+20m. The overall surface area of the CNT and cathode are all grounded, and the anode plate has a constant potential value of 100 V. The distribution of potential and electric field, field emission current are obtained by simulating with the help of COMSOL Multiphysics 4.3b electrostatics module. We find that with cathode radius decrease, the electric field strength over the surface of carbon nanotube (CNT) strengthening and field emission current increase.

A critical look at electric field emission of electrons from metallic surfaces

2008 ◽  
Vol 104 (6) ◽  
pp. 064909 ◽  
Author(s):  
Mahendra Singh Sodha ◽  
Amrit Dixit
Keyword(s):  
Electric Field ◽  
Field Emission ◽  
Metallic Surfaces ◽  
Field Emission Of Electrons

Temperature Effect on the Sensitivity of a Highly Sensitive Micro-Machined Displacement Sensor

2012 ◽  
Vol 622-623 ◽  
pp. 1396-1400
Author(s):  
Tania Mukherjee ◽  
Tarun K. Bhattacharyya
Keyword(s):  
Electric Field ◽  
Temperature Effect ◽  
Field Emission ◽  
Applied Electric Field ◽  
Tunneling Current ◽  
High Sensitivity ◽  
Emission Current ◽  
Displacement Sensor ◽  
Field Emission Current ◽  
Displacement Sensitivity

In this paper, a comparative study of temperature effect which introduces a thermionic current under a high applied electric field, on three different modes of field emission current, such as Tunneling current, Fowler-Nordheim current and Field emission current in between these two regions has been done. Moreover, an idea of micromechanical displacement sensor with high sensitivity, operating in Fowler-Nordheim current mode, has been proposed. The displacement sensitivity of proposed sensor in Fowler-Nordheim current domain is about 10-9 m/A. The displacement sensitivity has been shifted from its expected value due to thermal effect (at 700K temperature) at about 1010V/m applied electric field across tip gap.

Sign in / Sign up

Export Citation Format

Share Document