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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Zhang Huzhong, Li Detian, Wurz Peter, Cheng Yongjun, Wang Yongjun, Wang Chengxiang, Sun Jian, Li Gang, Fausch Rico Georgio,
Project Investigation of the Solar System with in situ Mass Spectrometry
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Original article (peer-reviewed)

Journal Materials
Volume (Issue) 12(18)
Page(s) 2937 - 2937
Title of proceedings Materials
DOI 10.3390/ma12182937

Open Access

URL http://doi.org/10.3390/ma12182937
Type of Open Access Publisher (Gold Open Access)

Abstract

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.
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