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. MDPI 10.3390/ma12182937

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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.

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