The effect of surface treatments on the field emission characteristics of patterned carbon nanotubes on KOVAR substrate

Lee, Keunsoo; Lee, Yang Doo; Kang, Byung Hyun; Dong, Ki Young; Baek, Jinho; Fai, Vincent Lau Chun; Kim, Won‐Seok; Yang, Cheol Min; Ju, Byeong Kwon

doi:10.1007/s11051-012-0890-9

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…The E cutoff values of the Kovar alloy substrate and the DIR- and DLR-layers fabricated on the substrate were 15.28, 15.29, and 15.05 eV, respectively, determined by linearly extrapolating the high binding energy region of the UPS spectra. In accordance with the E cutoff values, the work functions of the Kovar alloy substrate and the DIR- and DLR-adhesion layers were calculated as 5.92, 5.91, and 6.15 eV, respectively, which were closely consistent with the reported literature values. , The work function of the DIR-adhesion layer was reduced by 0.24 eV compared to that of the DLR-adhesion layer, which can be explained by the shifted Fermi level toward the conduction band in the DIR-adhesion layer as shown in Figure a.…”

Section: Resultssupporting

confidence: 88%

“…In accordance with the E cutoff values, the work functions of the Kovar alloy substrate and the DIRand DLR-adhesion layers were calculated as 5.92, 5.91, and 6.15 eV, respectively, which were closely consistent with the reported literature values. 26,38 The work function of the DIRadhesion layer was reduced by 0.24 eV compared to that of the DLR-adhesion layer, which can be explained by the shifted Fermi level toward the conduction band in the DIR-adhesion layer as shown in Figure 5a.…”

Section: Band Structure Analysis Of the And Dlr-cnt Paste Emittersmentioning

confidence: 97%

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Effects of Interfacial Electron Transport on Field Electron Emission from Carbon Nanotube Paste Emitters

Go,

Kim,

Jeong

et al. 2023

ACS Appl. Mater. Interfaces

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Field electron emission from carbon nanotubes (CNT) is preceded by the transport of electrons from the cathode metal to emission sites. Specifically, a supporting layer indispensable for adhesion of CNT paste emitters onto the cathode metal would impose a potential barrier, depending on its work function and interfacial electron transport behaviors. In this paper, we investigated the supporting layer of silicon carbide and nickel nanoparticles reacted onto a Kovar alloy (Fe–Ni–Co) cathode substrate, which has been adopted for reliable CNT paste emitters. The X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and electrical conductivity measurements showed that the reaction of silicon carbide and nickel nanoparticles on the Kovar metal strongly depends upon the post-vacuum-annealing conditions and can be classified into two procedures of a diffusion-induced reaction (DIR) and a diffusion-limited reaction (DLR). The prolonged annealing at 750 °C for 5 h before the main annealing of the CNT paste emitters at 800 °C for 5 min led to the DIR that has enhanced the Ni silicide phase and a lower potential barrier for the interfacial electron transport, resulting in increased and weakly temperature-dependent field electron emission from the CNT paste emitters. On the other hand, the DLR with only the main anneal of the CNT paste emitters at 800 °C for 5 min gave rise to a higher potential barrier for the electron transport and so lower and strongly temperature-dependent field electron emission. From the results of the interfacial electron transport for the DIR and DLR mechanisms in the CNT paste emitters, we concluded that the ambient temperature dependency of field electron emission from CNT tips in the moderate range of up to 400 °C, still controversial, is mainly attributed to the supporting layer of the CNT emitter rather than its intrinsic electron emission.

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Section: Resultssupporting

confidence: 88%

Section: Band Structure Analysis Of the And Dlr-cnt Paste Emittersmentioning

confidence: 97%

Effects of Interfacial Electron Transport on Field Electron Emission from Carbon Nanotube Paste Emitters

Go,

Kim,

Jeong

et al. 2023

ACS Appl. Mater. Interfaces

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Concentration detection of carbon nanotubes in electrophoretic suspension with UV–vis spectrophotometry for application in field emission devices

Shoujin

Yan

et al. 2013

Applied Surface Science

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The effect of surface treatments on the field emission characteristics of patterned carbon nanotubes on KOVAR substrate

Cited by 2 publications

References 25 publications

Effects of Interfacial Electron Transport on Field Electron Emission from Carbon Nanotube Paste Emitters

Effects of Interfacial Electron Transport on Field Electron Emission from Carbon Nanotube Paste Emitters

Concentration detection of carbon nanotubes in electrophoretic suspension with UV–vis spectrophotometry for application in field emission devices

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