scholarly journals Residual Gas Adsorption and Desorption in the Field Emission of Titanium-Coated Carbon Nanotubes

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2937 ◽  
Author(s):  
Huzhong Zhang ◽  
Detian Li ◽  
Peter Wurz ◽  
Yongjun Cheng ◽  
Yongjun Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Photoelectron Spectroscopy ◽  
Gas Adsorption ◽  
Mass Spectrometry Analysis ◽  
Emission Characteristic ◽  
Spectrometry Analysis ◽  
Pristine Cnts ◽  
Xps Characterization ◽  
Residual Gas

Titanium (Ti)-coated multiwall carbon nanotubes (CNTs) emitters based on the magnetron sputtering process are demonstrated, and the influences of modification to CNTs on the residual gas adsorption, gas desorption, and their field emission characteristic are discussed. Experimental results show that Ti nanoparticles are easily adsorbed on the surface of CNTs due to the “defects” produced by Ar+ irradiation pretreatment. X-ray photoelectron spectroscopy (XPS) characterization showed that Ti nanoparticles contribute to the adsorption of ambient molecules by changing the chemical bonding between C, Ti, and O. Field emission of CNTs coated with Ti nanoparticles agree well with the Fowler–Nordheim theory. The deviation of emission current under constant voltage is 6.3% and 8.6% for Ti-CNTs and pristine CNTs, respectively. The mass spectrometry analysis illustrated that Ti-coated CNTs have a better adsorption capacity at room temperature, as well as a lower outgassing effect than pristine CNTs after degassing in the process of field emission.

Improved field emission characteristic of carbon nanotubes by an Ag micro-particle intermediation layer

2008 ◽  
Vol 39 (5) ◽  
pp. 782-785 ◽  
Author(s):  
Wenhui Lu ◽  
Hang Song ◽  
Yixin Jin ◽  
Haifeng Zhao ◽  
Zhiming Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Emission Characteristic ◽  
Field Emission Characteristic

Preparation and Field Emission Properties of Ag-CNTs by Electroless Plating

2010 ◽  
Vol 148-149 ◽  
pp. 983-986 ◽  
Author(s):  
Yu Xiang You ◽  
Yun Ye ◽  
Yi Jing Su ◽  
Qiao Zhi Tang ◽  
Tai Liang Guo
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electroless Plating ◽  
Emission Current Density ◽  
Small Radius ◽  
Radius Of Curvature ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Pristine Cnts ◽  
Electrophoresis Deposition

Carbon nanotubes (CNTs) demonstrate attractive characteristics as cold cathode emitters for high aspect ratio, small radius of curvature, high mechanical strength and chemical stability. In this article, Ag-CNTs were prepared by a series of processes including acid-treating, sensitizing, activating and electroless plating. Then Ag-CNTs cathode were sucessfully fabricated by electrophoresis deposition (EPD) method. The morphologies of Ag-CNTs cathode and pristine CNTs cathode were observed by scanning electron microscopy (SEM). The results showed that the field emission properties of Ag-CNTs cathode were better than pristine CNTs cathode, for presenting lower turn-on field, larger emission current density, more stabilization and longer lifetime. Thus it can be seen that the Ag-CNTs cathode can improve the characteristics of carbon nanotubes field emission display (CNT-FED).

scholarly journals Field Emission Properties of Carbon Nanotubes with Boron Doping and H2O Adsorption

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Yijun Wang ◽  
Liuding Wang ◽  
Cheng Yan
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Boron Atom ◽  
Gas Adsorption ◽  
Mulliken Charge ◽  
Electronic Density ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Electron Field ◽  
Field Emission Of Electrons

Gas adsorption and atom doping usually present when preparing carbon nanotubes (CNTs) and can affect the field emission properties of carbon nanotubes. H2O molecule and boron atom are the most important adsorbates, respectively. Using ab-initio calculations, we have investigated the electron field emission performance of CNTs simultaneously adsorbed with one H2O molecule and doped with one boron atom (BCNT+H2O) in this paper. The results indicate that the electrons localize at the top of BCNT+H2O and the electronic density of states (DOS) around the Fermi level is enhanced obviously. It is expected that BCNT+H2O will be more propitious to the field emission of electrons based on the calculations of DOS, HOMO/LUMO, and Mulliken charge population.

Field Emission Properties of Vertically Aligned Carbon Nanotubes Driven by Polar and Non-Polar Gas Adsorption

2001 ◽  
Vol 706 ◽  
Author(s):  
Youngsik Song ◽  
Brian Usner ◽  
Jaewu Choi ◽  
Seong-Chu Lim ◽  
Young Hee Lee
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Field Emission ◽  
Gas Adsorption ◽  
Bias Effect ◽  
Multiwalled Carbon ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Vertically Aligned ◽  
A Charge

AbstractWe studied the gas adsorption effects on the field emission properties of vertically aligned multiwalled carbon nanotube films by exposing them to polar (H2O) and non-polar (N2O) gas molecules. The charge transfer between adsorbates and carbon nanotubes plays an important role in the field emission properties. With bias voltage ~ 1.2V/μm, the field emission properties of the carbon nanotubes are improved by exposing the nitrous oxide while the bias effect with water exposure is less significant. The improvement of the field emission properties by gas exposure is attributed not only to the change in the work function of the carbon nanotubes caused by a charge transfer, but also to the reactivity of the adsorbate gas with localized-cap states.

The Fabrication Study of Branched Cathode Electrode for Field Emitter in a FED Panel

2012 ◽  
Vol 459 ◽  
pp. 652-655
Author(s):  
Xiao Quan Li
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Voltage Drop ◽  
Conducting Layer ◽  
Emission Characteristic ◽  
Field Emission Display ◽  
Field Emitters ◽  
Cathode Electrode ◽  
Field Emission Characteristic ◽  
Supporting Layer

Using carbon nanotubes as field emitters, the field emission display panel with branched cathode electrode was fabricated. For the cathode faceplate, the branched cathode electrode was composed of the emitter conducting layer and the emitter supporting layer. On the emitter supporting layer surface the carbon nanotubes field emitters were prepared, and the emitter conducting layer would be covered with the emitter insulation layer. The applied cathode potential would be conducted by the emitter conducting layer, which could decrease the additional voltage drop. The good field emission characteristic for the fabricated field emission display panel was confirmed.

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