Polymer supported carbon nanotube arrays for field emission and sensor devices

Watts, Paul; Lyth, Stephen M.; Mendoza, Ernest; Silva, S. Ravi P.

doi:10.1063/1.2345615

Cited by 33 publications

(14 citation statements)

References 24 publications

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“…Recently, new methods have been developed to enable control over the CNT dispersion within polymer matrices without damaging the CNT structure. One of the promising techniques uses polymer solution infiltration into CNT sheets grown by chemical vapor deposition (CVD) . Using this method, agglomeration is prevented since the CNTs are fixed to a substrate and, hence, their location and orientation are inherently preserved.…”

Section: Polyimide–carbon Nanocompositesmentioning

confidence: 99%

Advances in Polyimide‐Based Materials for Space Applications

Gouzman¹,

Grossman²,

Verker³

et al. 2019

Advanced Materials

491

252

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The space environment raises many challenges for new materials development and ground characterization. These environmental hazards in space include solar radiation, energetic particles, vacuum, micrometeoroids and debris, and space plasma. In low Earth orbits, there is also a significant concentration of highly reactive atomic oxygen (AO). This Progress Report focuses on the development of space‐durable polyimide (PI)‐based materials and nanocomposites and their testing under simulated space environment. Commercial PIs suffer from AO‐induced erosion and surface electric charging. Modified PIs and PI‐based nanocomposites are developed and tested to resist degradation in space. The durability of PIs in AO is successfully increased by addition of polyhedral oligomeric silsesquioxane. Conductive materials are prepared based on composites of PI and either carbon nanotube (CNT) sheets or 3D‐graphene structures. 3D PI structures, which can expand PI space applications, made by either additive manufacturing (AM) or thermoforming, are presented. The selection of AM‐processable engineering polymers in general, and PIs in particular, is relatively limited. Here, innovative preliminary results of a PI‐based material processed by the PolyJet technology are presented.

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Section: Polyimide–carbon Nanocompositesmentioning

confidence: 99%

Advances in Polyimide‐Based Materials for Space Applications

Gouzman¹,

Grossman²,

Verker³

et al. 2019

Advanced Materials

491

252

View full text Add to dashboard Cite

show abstract

“…The current stability of graphene-diamond is superior to that of graphene alone 9 and typical carbon nanotube arrays and analogous composite materials based on carbon nanotubes. 37 Slow field emission degradation was observed in the first 5 days from 50 to 10 lA/cm 2 and excellent emission stability from then onward.…”

Section: -4mentioning

confidence: 99%

Free standing graphene-diamond hybrid films and their electron emission properties

Varshney

Rao

Guinel

et al. 2011

Journal of Applied Physics

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Free standing graphene-diamond hybrid films have been fabricated using saturated hydrocarbon polymers as seeding material by hot filament chemical vapor deposition technique. The films are characterized with x-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron energy loss spectroscopy (EELS). The XRD shows the characteristic diffraction peaks of both diamond and graphene. The Raman spectrum shows the characteristic band of diamond at 1332 cm−1 and D, G, and 2D bands of graphene at 1349, 1592, and 2687 cm−1, respectively. Both SEM and TEM depict the presence of diamond and graphene in the films. The EELS recorded in the carbon K-edge region also shows the signature peaks of diamond and graphene. The free standing hybrid films exhibit a remarkably low turn-on field of about 2.4 V/μm and a high emission current density of 0.1 mA/cm2. Furthermore, emission currents are stable over the period of 7 days. The superior field emission characteristics of the free standing graphene-diamond hybrid films are attributed to the heat sink capability of diamond and high electrical conductivity of graphene.

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“…10 They have high electrical and thermal conductivity, making them ideal candidates for use in electrical devices 11,12 such as sensors. 13,14 CNTs can be grown over large areas 15 and at low temperatures, 16 making them perfect for large area applications on temperature-sensitive substrates. Of interest in this work are the FE properties of CNTs.…”

mentioning

confidence: 99%

Resonant behavior observed in electron field emission from acid functionalized multiwall carbon nanotubes

Lyth

Silva

2009

Applied Physics Letters

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Acid functionalized multiwall carbon nanotube ink was deposited onto carbon fiber fabric via dip coating. Repeatable staircaselike current-field curves were observed in the field emission data. These atypical curves are attributed to resonant tunneling through localized surface states in a quantum well structure, which arises due to the presence of the surface carboxylic functional group. 17-20 CNTs can be solubilized by an acid oxidative chemical treatment, resulting in the formation of carboxylic acid groups attached to the CNT ends and sidewalls, 21 which readily interact with water molecules via hydrogen bonding. Acid treatment also purifies CNTs, dissolving catalytic particles and amorphous carbon.22 Solubilization opens the door to a variety of cost effective, scalable, room temperature deposition techniques, such as spin-coating and ink-jet printing; thus CNT inks can be deposited onto a plethora of different substrates. The excellent FE properties of CNT ink on paper substrates have recently been explored. In previous work by the authors, the surface of multiwall CNTs ͑MWNTs͒ was chemically modified, resulting in a change in work function 24 and thereby a change in the FE properties. 25 Subsequently, close analysis of the FE characteristics of acid-oxidized MWNTs ͑o-MWNTs͒ revealed unexpected staircaselike increases in the current-field curves. Here, these atypical curves are analyzed, and the results are discussed in terms of RT through localized surface states. High purity, 10 nm diameter MWNTs were purchased from Nanocyl. Acid oxidization was performed as previously described.25 Carbon fiber fabric ͑Ballard͒ was used as a substrate due to its high conductivity and good FE properties, and it was rendered hydrophilic via a 10 s oxygen plasma microwave treatment. This results in the formation of oxygen containing moieties, 26 promoting wetting between the o-MWNT ink and the carbon fiber. Hydrogen bonding is also expected to provide strong adhesion between the carbon fiber and the o-MWNTs. After plasma treatment, the carbon fabric was dip-coated in o-MWNT ink and then baked at 100°C for 20 min. FE characterization was conducted as previously described.25

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Polymer supported carbon nanotube arrays for field emission and sensor devices

Cited by 33 publications

References 24 publications

Advances in Polyimide‐Based Materials for Space Applications

Advances in Polyimide‐Based Materials for Space Applications

Free standing graphene-diamond hybrid films and their electron emission properties

Resonant behavior observed in electron field emission from acid functionalized multiwall carbon nanotubes

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