Simple fabrication of micro time-of-flight mass spectrometer using a carbon nanotube ionizer

Lee, Ki Jung; Hong, Nguyen Tuan; Lee, Soonil; You, Dong-Wook; Jung, Kwang‐Woo; Yang, Sang Sik

doi:10.1016/j.snb.2016.12.007

Cited by 4 publications

(1 citation statement)

References 45 publications

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“…FE characteristics of nanotubes from a single multi-walled nanotube (MWNT) and MWNT film were first reported by Rinzler et al and de Heer et al, respectively [14,15]. Subsequently, many CNTs FE emitters were reported to be applied in power microwave sources, ion source, electric propulsion, X-ray tubes, vacuum gauges, and more [16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Würz

Cheng³

et al. 2019

Materials

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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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