Using infrared laser to enhance field emission of carbon nanotube

Hwang, Joon; Chen, K. F.; Chan, L.; Chang, Yuchou

doi:10.1063/1.2222337

Cited by 12 publications

(6 citation statements)

References 9 publications

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“…However, a further increase in laser power density at and above 6 MW/ cm 2 decreased the field-emission current density due to the thermal effect by the energetic laser annealing. 14 Figure 3͑a͒ shows the Raman spectra of CNT cathodes treated with various plasma and laser conditions. The locations of all the D-and G-line peaks are almost not changed, showing the different peak intensities of each peak.…”

Section: Methodsmentioning

confidence: 99%

Relationship between field-emission characteristics and defects measured by Raman scattering in carbon-nanotube cathodes treated by plasma and laser

Kim

Oki

Kinoshita

et al. 2008

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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The relationship between field-emission characteristics and defects measured by Raman scattering for printed carbon-nanotube cathodes treated by plasma and laser was investigated. The Raman intensity ratio of the D to G bands (ID/IG) was 0.71 in the case of an untreated sample. With laser irradiation, the ID/IG ratio increased to 0.76, which resulted in the increase of the emission-current density. Moreover, with the plasma and additional laser treatment, the ID/IG ratio further increased to 1.15, which resulted in the much higher increase of the emission current density. This result indicates that the induced defects, acting as emission sites, together with the improved field-enhancement factor by the surface treatment, play important roles for increasing the field-emission current density.

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Section: Methodsmentioning

confidence: 99%

Relationship between field-emission characteristics and defects measured by Raman scattering in carbon-nanotube cathodes treated by plasma and laser

Kim

Oki

Kinoshita

et al. 2008

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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“…7 Field emission devices based on CNTs have been realized using a variety of methods ranging from the chemical vapor deposition (CVD) process, assembling in more complex systems and using screen printed techniques. [16][17][18][19][20][21][22][23][24][25] Several studies have demonstrated an enhancement of electron field emission after laser treatments performed both on screen-printed CNTs and those created using CVD techniques. To achieve high current densities and stability, postsynthesis treatment can be adopted, including thermal, chemical, and laser treatments.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes field emission enhancement using a laser post treatment

Ulisse

Brunetti

Carlo

et al. 2015

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Articles you may be interested inEnhanced field emission from cerium hexaboride coated multiwalled carbon nanotube composite films: A potential material for next generation electron sources J. Appl. Phys. 115, 094302 (2014); 10.1063/1.4866990Effect of purity, edge length, and growth area on field emission of multi-walled carbon nanotube emitter arrays This paper reports the fabrication of a cold cathode based on carbon nanotubes (CNTs) using a combined chemical vapor deposition technique and a laser processing treatment. The CNTs are exposed to a focused 514 nm continuous-wave laser at varying power, and the changes of the CNTs characteristics after each laser treatment are investigated by Raman spectroscopy and scanning electron microscopy. It is seen that a laser treatment at 70 mW produces an improved emitter, characterized by an increase of the field emitted current up to 350 times, which obtains a maximum current density of 0.13 A/cm 2 . The CNT deposit exhibits good time stability and a good resistance under high applied electric fields up to 33 V/lm. The results obtained in terms of current density make the laser treatment an excellent process for increasing the performance of cathodes to be used in electron guns for vacuum tubes where high current densities are required.

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“…Previous studies reported that the FE properties of CNTs [6,7] and other material such as ZnO nanowires [8] would be greatly enhanced after laser treatment. With similar structure, graphene may also have the opportunity to improve the FE properties after laser treatment.…”

Section: Introductionmentioning

confidence: 99%

The field emission of graphene films reduced by laser treatment

Cai

Liu

Peng

et al. 2013

2013 26th International Vacuum Nanoelectronics Conference (IVNC)

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In this study, infrared laser has been employed to reduee graphene oxide films prepared by eleetrophoretic deposition. The field emission performance of laser reduction of graphene oxide (IrGO) films was remarkably enhanced. For comparison, chemical reduction of graphene oxide (crGO) films were deposited in the same eondition, but they were redueed by a hydrazine hydrate process. It was found that both the turn-on and threshold field of sample of IrGO were much lower than that of crGO.

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Using infrared laser to enhance field emission of carbon nanotube

Cited by 12 publications

References 9 publications

Relationship between field-emission characteristics and defects measured by Raman scattering in carbon-nanotube cathodes treated by plasma and laser

Relationship between field-emission characteristics and defects measured by Raman scattering in carbon-nanotube cathodes treated by plasma and laser

Carbon nanotubes field emission enhancement using a laser post treatment

The field emission of graphene films reduced by laser treatment

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