Effects of High-Density Oxygen Plasma Posttreatment on Field Emission Properties of Carbon Nanotube Field-Emission Displays

Juan, Chao-Kuei; Tsai, Chien-Chung; Chen, Kuei‐Hsien; Chen, Li‐Chyong; Cheng, Hsiu‐Fung

doi:10.1143/jjap.44.8231

Cited by 19 publications

(13 citation statements)

References 11 publications

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“…This work details the use of an oxygen plasma etch to dramatically improve device yield by reversing shorting of the gate after CNT synthesis -a common time for a short to develop. The use of different plasma treatments on CNTs are commonly used to improve FE performance [19][20][21][22], by introducing defects as FE sites [23] and reducing screening by neighboring CNTs [24,25]. However, no published work seems to detail the use of a plasma etch to reverse shorting of a Spindt type CNT electron source.…”

Section: Introductionmentioning

confidence: 99%

Oxygen plasma resurrection of triode type carbon nanotube field emission cathodes

Sanborn

Turano

Ready

2014

Diamond and Related Materials

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Section: Introductionmentioning

confidence: 99%

Oxygen plasma resurrection of triode type carbon nanotube field emission cathodes

Sanborn

Turano

Ready

2014

Diamond and Related Materials

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“…Many schemes have been implemented worldwide for the minimisation of shielding effect such as by varying the height and spacing of vertically aligned CNTs [19], controlling the tip densities of CNTs [20]. There are other reports like plasma treatment [21,22], wet etching [23] and HF acid treatment [24] of grown CNTs for improving field emission current. R Seelaboyina et al have proposed multistage growth [25] while J. Hu et al tried onion shaped tips [26] for enhancing the current density.…”

Section: Introductionmentioning

confidence: 99%

Novel ring structure for minimisation of screening effect in carbon nanotube based field emitters

Gautam

Shah

Jha

et al. 2013

Journal of Experimental Nanoscience

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Carbon Nanotubes (CNTs) are promising candidates for cold cathodes because of their high aspect ratio and robustness. However, the major hindrance in cold cathode based applications is the screening effect, which reduces the effective field at the tip and thereby the current density. The emission current can be improved by minimising the screening effect. The adverse effect of screening can be addressed by either controlling the growth density or by optimising the patterns of CNT cathodes. Here, novel patterns have been used to increase edge length per unit area in planar vertically aligned CNT bundles. Our motive was to increase the number of effective emitters, since the CNT at the edges are less screened by the proximal CNTs. By varying geometry and spacing of solid CNT dot patterns and by introducing the square ring structures; we could successfully enhance the effective emitters at the edges. It has been observed that an enhancement of edge length from 0.032 per micron to 0.2 per micron increases the current density from 0.71mA/cm 2 to 16.2 mA/cm 2 at a field of 4.5 V/mm. CNTs in dotted structure with high value of edge length per unit area emit very high current density as compared to other dotted structures with low value of edge length per unit area Simulation studies confirms our argument that CNTs at the corners are the least screened and have the maximum local electric field.

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“…15͒ has been used to alter the FE properties of CNT arrays by removing surface amorphous carbon impurities, 16,17 introducing defects, 15 and by modifying the work function of the surface of the CNTs. 12 Previous work has shown that O 2 impurities etch the base of the CNTs during FE characterization due to large contact resistances between the substrate and CNTs, resulting in an increase in threshold field.…”

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Polymer supported carbon nanotube arrays for field emission and sensor devices

Watts

Lyth

Mendoza

et al. 2006

Applied Physics Letters

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The authors report a simple method for providing a polymer support structure for carbon nanotube ͑CNT͒ arrays for device applications. This method has a twofold effect: firstly it secures the nanotubes to the substrate and secondly it significantly decreases the threshold field for field emission from 26.2 to 9.7 V / m. This method ensures that the main body and tips of the CNTs are polymer-free and therefore can also be applied to CNT sensor array device fabrication. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2345615͔ Aligned carbon nanotube ͑CNT͒ arrays 1,2 are attracting increased interest for sensing applications and are currently studied as platforms for a variety of sensor devices 3-5 and field emission ͑FE͒ sources in flat screen displays.6,7 An underlying drawback for CNT arrays being used as sensing platforms is the fact that the nanotubes are weakly bound to the silicon substrate and are susceptible to facile detachment ͓Fig. 1͑a͒: effect from scratching͔, which reduces performance and lifetime, when incorporated in sensor and display technologies. Recently, there has been much investigation into the possible toxicological effects of carbon nanotubes with biological systems. 8,9 In the case of CNT electrophysiological sensors, 10 nanotube detachment from the substrate becomes an important issue.There are several additional issues to be tackled if CNTs are to become viable FE materials, such as improvement of turn on fields, mechanical stability, and the robustness of the substrates. Degradation of CNT arrays during FE occurs mainly due to mechanical failure at the tube-substrate contact and resistive heating.11 Plasma post-treatment with O 2 , 12 CF 4 , 13 Ar, 14 and H 2 ͑Ref. 15͒ has been used to alter the FE properties of CNT arrays by removing surface amorphous carbon impurities, 16,17 introducing defects, 15 and by modifying the work function of the surface of the CNTs.12 Previous work has shown that O 2 impurities etch the base of the CNTs during FE characterization due to large contact resistances between the substrate and CNTs, resulting in an increase in threshold field. 18Our previous work has revealed that polystyrene ͑PS͒-multiwall carbon nanotube ͑MWNT͒ composite films exhibit excellent FE properties ͑low threshold fields: 1.6 V / m͒ from the fracture surface at relatively low CNT concentrations ͑ca. 12 wt. %͒. 19,20 Further investigation of the fracture surface by scanning electron microscopy ͑SEM͒ shows that after the MWNTs have been pulled out of the PS matrix, there remains polymer attached to the nanotube surface, indicating good adhesion between the tubes and polymer ͓Fig. 1͑b͔͒.We have developed a facile method for the fabrication of a thin PS support, which holds the tubes securely to the substrate surface while ensuring that the nanotubes are free of polymer and available for FE and chemical/biological functionalization. We demonstrate that the FE properties are noticeably enhanced after the polymer layer has been fabricated due to the oxygen plasma treatment step. Thres...

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Effects of High-Density Oxygen Plasma Posttreatment on Field Emission Properties of Carbon Nanotube Field-Emission Displays

Cited by 19 publications

References 11 publications

Oxygen plasma resurrection of triode type carbon nanotube field emission cathodes

Oxygen plasma resurrection of triode type carbon nanotube field emission cathodes

Novel ring structure for minimisation of screening effect in carbon nanotube based field emitters

Polymer supported carbon nanotube arrays for field emission and sensor devices

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