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

Zhang, Huzhong; Li, Detian; Wurz, Peter; Cheng, Yongjun; Wang, Yongjun; Wang, Chengxiang; Sun, Jian; Li, Gang; Fausch, Rico (2019). Residual Gas Adsorption and Desorption in the Field Emission of Titanium-Coated Carbon Nanotubes. Materials, 12(18), p. 2937. Molecular Diversity Preservation International MDPI 10.3390/ma12182937

[img]
Preview
Text
materials-12-02937.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (5MB) | Preview

Titanium (Ti)-coated multiwall carbon nanotubes (CNTs) emitters based on the magnetronsputtering process are demonstrated, and the influences of modification to CNTs on the residual gasadsorption, gas desorption, and their field emission characteristic are discussed. Experimental resultsshow that Ti nanoparticles are easily adsorbed on the surface of CNTs due to the “defects” producedby Ar+irradiation pretreatment. X-ray photoelectron spectroscopy (XPS) characterization showedthat Ti nanoparticles contribute to the adsorption of ambient molecules by changing the chemicalbonding between C, Ti, and O. Field emission of CNTs coated with Ti nanoparticles agree well withthe Fowler–Nordheim theory. The deviation of emission current under constant voltage is 6.3% and8.6% for Ti-CNTs and pristine CNTs, respectively. The mass spectrometry analysis illustrated thatTi-coated CNTs have a better adsorption capacity at room temperature, as well as a lower outgassingeffect than pristine CNTs after degassing in the process of field emission.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Wurz, Peter and Fausch, Rico

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

1996-1944

Publisher:

Molecular Diversity Preservation International MDPI

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

17 Sep 2019 16:02

Last Modified:

04 Nov 2019 10:21

Publisher DOI:

10.3390/ma12182937

BORIS DOI:

10.7892/boris.133288

URI:

https://boris.unibe.ch/id/eprint/133288

Actions (login required)

Edit item Edit item
Provide Feedback