High thermionic emission from barium strontium oxide functionalized carbon nanotubes thin film surface

2017 ◽  
Vol 110 (21) ◽  
pp. 213109 ◽  
Author(s):  
Feng Jin ◽  
Allyn Beaver
Keyword(s):  
Thin Film ◽  
Carbon Nanotubes ◽  
Thermionic Emission ◽  
Film Surface ◽  
Strontium Oxide ◽  
Functionalized Carbon Nanotubes ◽  
Thin Film Surface ◽  
Barium Strontium

Stoichiometric composition of thin-film surface structures and its influence on the functional characteristics as regards gyroscopic devices

2020 ◽  
pp. 78-90
Author(s):  
M. A. Tit ◽  
S. N. Belyaev
Keyword(s):  
Thin Film ◽  
Titanium Nitride ◽  
Niobium Carbide ◽  
Structural Phase ◽  
Stoichiometric Composition ◽  
Film Surface ◽  
Surface Structures ◽  
Functional Surface ◽  
Base Surface ◽  
Thin Film Surface

This article considers the research results of the effect of stoichiometry on the properties of titanium nitride thin-film coatings of the float and electrostatic gyroscopes. It presents the results of tests of such mechanical and optical characteristics of titanium nitride thin-film structures as microhardness, resistance to wear and friction, and image contrast determined by the reflection coefficients of a titanium nitride base surface and a raster pattern formed by local laser oxidation. When making a rotor of a cryogenic gyroscope, the prospects of use and technological methods for the formation of functional surface structures of niobium carbide and nitride are considered. It is shown that during the formation of coatings of the required composition, the most important is the thermodynamic estimation of possible interactions. These interactions allow us to accomplish the structural-phase modification of the material, which is determined by the complex of possible topochemical reactions leading to the formation of compounds, including non-stoichiometric composition.

A New Thermionic Cathode Based on Carbon Nanotubes with a Thin Layer of Low Work Function Barium Strontium Oxide Surface Coating

2008 ◽  
Vol 1142 ◽  
Author(s):  
Feng Jin ◽  
Yan Liu ◽  
Scott A Little ◽  
Chris M Day
Keyword(s):  
Work Function ◽  
Current Density ◽  
Enhancement Factor ◽  
Thermionic Emission ◽  
Field Enhancement ◽  
Oxide Coating ◽  
Emission Current Density ◽  
Emission Current ◽  
Strontium Oxide ◽  
Barium Strontium

ABSTRACTWe have created a thermionic cathode structure that consists of a thin tungsten ribbon; carbon nanotubes (CNTs) on the ribbon surface; and a thin layer of low work function barium strontium oxide coating on the CNTs. This oxide coated CNT cathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive oxide coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 1.9 eV were obtained. At 1221 K, a thermionic emission current density of 1.22A/cm2 in an electric field of 1.1 V/μm was obtained, which is four orders of magnitude greater than the emission current density from the uncoated CNT cathode at the same temperature. The high emission current density at such a modest temperature is among the best ever reported for an oxide cathode.

Microarray of neuroblastoma cells on the selectively functionalized nanocrystalline diamond thin film surface

2016 ◽  
Vol 361 ◽  
pp. 269-276 ◽  
Author(s):  
Young-Sang Park ◽  
Hyeong-Guk Son ◽  
Dae-Hoon Kim ◽  
Hong-Gi Oh ◽  
Da-Som Lee ◽  
...  
Keyword(s):  
Thin Film ◽  
Neuroblastoma Cells ◽  
Film Surface ◽  
Nanocrystalline Diamond ◽  
Thin Film Surface ◽  
Diamond Thin Film

Thin Film Surface Resistance Measurements For Superconducting Cavity Applications

1991 ◽  
pp. 155-160
Author(s):  
A. Andreone ◽  
C. Attanasio ◽  
A. Di Chiara ◽  
L. Maritato ◽  
A. Nigro ◽  
...  
Keyword(s):  
Thin Film ◽  
Surface Resistance ◽  
Film Surface ◽  
Superconducting Cavity ◽  
Thin Film Surface
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