Operation of a gated field emitter using an individual carbon nanofiber cathode

Guillorn, Michael A.; Melechko, Anatoli V.; Merkulov, Vladimir I.; Ellis, Elizabeth D.; Britton, C.L.; Simpson, Michael L.; Lowndes, D. H.; Baylor, L. R.

doi:10.1063/1.1419038

Cited by 93 publications

(45 citation statements)

References 12 publications

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“…Performing an atmospheric pressure plasma process in a microreactor leads to precise control of process parameters such as residence time and heat transfer, and also extreme quenching conditions, enabling control over the reactants to selectively produce desirable products (Nozaki et al, 2004). W 18 O 49 nanowires gave outstanding field emission characteristics with low threshold voltages due to local field enhancement and high aspect ratio (Guillorn et al, 2001 andZhou et al, 2005). Process of Source: Nanowires, Book edited by: Paola Prete, ISBN 978-953-7619-79-4, pp.…”

Section: Introductionmentioning

confidence: 99%

On-Chip Tungsten Oxide Nanowires Based Electrodes for Charge Injection

Agiral¹,

Gardeniers²

2010

Nanowires

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Section: Introductionmentioning

confidence: 99%

On-Chip Tungsten Oxide Nanowires Based Electrodes for Charge Injection

Agiral¹,

Gardeniers²

2010

Nanowires

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“…The impact of pressure, temperature, gas ratio, choice of catalyst material, and even catalyst geometry on fiber morphology and growth rate have been explored [7][8][9][10][11][12][13][14][15][16]. Furthermore, the integration of ensembles of individual fibers and stochastic nanofiber forests into functional devices for electrochemical and biochemical sensing [17][18][19][20][21][22][23][24][25][26], gated-cathode field emitters [27][28][29], barriers to material transport [30][31][32] and templates for the synthesis of nanofluidic nozzles, or nanopipes [33,34], has also been described. These ensembles have benefited from fiber redundancy and as such are not impacted significantly by isolated defects in the form of missing or migrated fibers.…”

Section: Introductionmentioning

confidence: 99%

Positional control of catalyst nanoparticles for the synthesis of high density carbon nanofiber arrays

Retterer

Melechko

Hensley

et al. 2008

Carbon

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Precise arrangement of nanoscale elements within larger systems, is essential to controlling higher order functionality and tailoring nanophase material properties. Here, we present findings on growth conditions for vertically aligned carbon nanofibers that enable synthesis of high density arrays and individual rows of nanofibers, which could be used to form barriers for restricting molecular transport, that have regular spacings and few defects. Growth through plasma-enhanced chemical vapor deposition was initiated from precisely formed nickel catalyst dots of varying diameter and spacing that were patterned through electron beam lithography. Nanofiber growth conditions, including power, precursor gas ratio, growth temperature and pressure were varied to optimize fiber uniformity and minimize defects that result from formation and migration of catalyst particles prior to growth. It was determined that both catalyst dot diameter and initial plasma power have a considerable influence on the number and severity of defects, while growth temperature, gas ratio (C 2 H 2 :NH 3 ) and pressure can be varied within a considerable range to fine-tune nanofiber morphology.

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“…11 Since carbon nanostructures have started to stand on their feet in the form of VACNFs and VANTAs, they have provided an unprecedented opportunity to realize a new bottom-up-engineered material with excellent mechanical and electrical properties which could exploit the third dimension at a reasonable cost. It came as no surprise to see the new material being employed in a large spectrum of applications, from thermal interfaces 15 and flip-chip bumps 16 to electron emitters [17][18][19] and gene delivery arrays. 20,21 The achievements during the last few years in reproducible synthesis of high quality VACNFs and VANTAs have extended the boundaries of their application to the realm of nanoelectromechanical systems (NEMS).…”

mentioning

confidence: 99%

Vertically aligned carbon based varactors

Ghavanini

Enoksson

Bengtsson

et al. 2011

Journal of Applied Physics

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This paper gives an assessment of vertically aligned carbon based varactors and validates their potential for future applications. The varactors discussed here are nanoelectromechanical devices which are based on either vertically aligned carbon nanofibers or vertically aligned carbon nanotube arrays. A generic analytical model for parallel plate nanoelectromechanical varactors based on previous works is developed and is used to formulate a universal expression for their voltage-capacitance relation. Specific expressions for the nanofiber based and the nanotube based varactors are then derived separately from the generic model. This paper also provides a detailed review on the fabrication of carbon based varactors and pays special attention to the challenges in realizing such devices. Finally, the performance of the carbon based varactor is assessed in accordance with four criteria: the static capacitance, the tuning ratio, the quality factor, and the operating voltage. Although the reported performance is still far inferior to other varactor technologies, our prognosis which stems from the analytical model shows a promise of a high quality factor as well as a potential for high power handling for carbon based varactors.

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Operation of a gated field emitter using an individual carbon nanofiber cathode

Cited by 93 publications

References 12 publications

On-Chip Tungsten Oxide Nanowires Based Electrodes for Charge Injection

On-Chip Tungsten Oxide Nanowires Based Electrodes for Charge Injection

Positional control of catalyst nanoparticles for the synthesis of high density carbon nanofiber arrays

Vertically aligned carbon based varactors

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