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Open AccessArticle

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

1
Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, China
2
Physics Institute, University of Bern, 3012 Bern, Switzerland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2937; https://doi.org/10.3390/ma12182937
Received: 29 July 2019 / Revised: 28 August 2019 / Accepted: 2 September 2019 / Published: 11 September 2019
(This article belongs to the Special Issue Advances in Chemical Vapor Deposition)
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. View Full-Text
Keywords: carbon nanotubes; residual gas adsorption; residual gas desorption; field emission carbon nanotubes; residual gas adsorption; residual gas desorption; field emission
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MDPI and ACS Style

Zhang, H.; Li, D.; Wurz, P.; Cheng, Y.; Wang, Y.; Wang, C.; Sun, J.; Li, G.; Fausch, R.G. Residual Gas Adsorption and Desorption in the Field Emission of Titanium-Coated Carbon Nanotubes. Materials 2019, 12, 2937.

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