The fabrication of carbon-nanotube-coated electrodes and a field-emission-based luminescent device

Agarwal, Sanjay; Sarada, B. Yamini; Kar, Kamal K.

doi:10.1088/0957-4484/21/6/065601

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…MWNT loading in CTA and the improved properties of CMT composite films make them cost‐effective EMI shielding materials compared with other carbon fiber‐ and carbon black‐filled polymer composites in different electronic device applications. The required EMI shielding of conductive composites for different electronic devices is about 15–20 dB [47,48]. The RCS value of the composite CMT‐20 is about 30–35 and that of CMT‐40 is about 40–45 dB at GHz in the given frequency range, thus showing promise for its commercial use as EMI shielding materials for different electronic devices.…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic interference shielding of cellulose triacetate/multiwalled carbon nanotube composite films

Basavaraja¹,

Jo²,

Kim³

et al. 2011

Polymer Composites

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Cellulose triacetate (CTA) and multiwalled carbon nanotube (MWNT) composite films were prepared by dispersing different weight percentages of MWNTs into a CTA solution. These composite blends were characterized by UV-vis spectroscopy (UV), and their surface mophology, thermal stability, and amended crystallinity were determined by atomic force microscopy (AFM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD), respectively. Measurements of the complex impedance of the composite samples were made in the form of films. Sheets prepared from conventional techniques were used to study microwave absorption in the microwave range of 2-12 GHz, and the effects of sample thickness on microwave absorption were investigated. The experimental results show that the electrical conductivity of composites increases with the increase in MWNT loading without a percolation threshold. POLYM. COM-POS., 32:438-444,

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Section: Resultsmentioning

confidence: 99%

Electromagnetic interference shielding of cellulose triacetate/multiwalled carbon nanotube composite films

Basavaraja¹,

Jo²,

Kim³

et al. 2011

Polymer Composites

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“…The performance is sensitive to the composition, morphology, and aspect ratio of the emitting material. Among many potential materials, C-based emitters are widely explored due to their excellent physical and chemical properties. − ,− Because of their unique morphology, CNCs have shown excellent EFE characteristics. , In this article, we wish to report our investigations on the factors affecting the growth of CNCs and the variables influencing their EFE properties.…”

Section: Introductionmentioning

confidence: 99%

“…2−5,34−41 Because of their unique morphology, CNCs have shown excellent EFE characteristics. 42,43 In this article, we wish to report our investigations on the factors affecting the growth of CNCs and the variables influencing their EFE properties.…”

Section: ■ Introductionmentioning

confidence: 99%

K and Au Bicatalyst Assisted Growth of Carbon Nanocoils from Acetylene: Effect of Deposition Parameters on Field Emission Properties

Tsou

Lee

Chiu

2012

ACS Appl. Mater. Interfaces

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We demonstrated the growth of carbon nanocoils (CNCs) via chemical vapor deposition (CVD) using Au and K metals as the catalysts to assist the thermal decomposition of C(2)H(2). Typical CNCs (wire diameter: 50-80 nm, coil diameter: 110-140 nm, pitch: 100-200 nm, tens of micrometers), identified as amorphous coiled carbon fibers by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), were grown at proper combinations of reaction parameters. Au nanoparticles (NPs), identified by energy dispersion X-ray spectroscopy (EDX) and electron diffraction (ED), were located at the tips of the CNCs. The observations suggested that a tip-growth mechanism involving the Au NPs as the nucleation sites was in operation. In the reaction, the liquid-phase K metal assisted the decomposition of C(2)H(2) by lowering the reaction temperature. We propose that acetylide and hydride intermediates were formed in the reaction. Further decomposition of the acetylide intermediates generated solid-phase carbon to grow the CNCs. Effects of varying the reaction conditions on the CNC growth were investigated. On the basis of the results, a Au and K bicatalyst enhanced tip-growth vapor-liquid-solid (VLS) mechanism was proposed to rationalize the CNC formation process. Electron field emission (EFE) characteristics of the CNCs were studied. The best EFE result showed a turn-on field (E(to)) of 3.78 V/μm and a field enhancement factor (β) of 1852. In addition, the current density (J) was as high as 43 mA/cm(2) at 6.87 V/μm. The data suggest that the CNCs could be employed for field emission device applications.

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“…Loading different GO concentrations (wt%) into the PPG nanocomposites provides higher EMI shielding effect. The maximum RCS value for PPG-50 is about 30 dB, which is appreciable, because the required EMI shielding of conductive composites for different electronic devices ranges from 15 to 20 dB [51,52]. Moreover, PPG-50 is water-soluble and has conductivity as high as 0.071 S cm 21 .…”

Section: Water Solubility and Electrical Behaviormentioning

confidence: 99%

Microstructural and microwave shielding characteristics of water‐soluble polypyrrole–polyvinyl alcohol–graphite oxide core–shell nanocomposites

et al. 2012

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This article reports on a facile route for the preparation of polypyrrole–polyvinyl alcohol–graphite oxide nanocomposites through the polymerization of pyrrole with different concentration (wt%) of graphite oxide using ammonium persulfate as an oxidant. The synthesized nanocomposites were characterized by Fourier transform infrared spectroscopy, and their surface morphologies were studied by scanning electron microscopy and transmission electron microscopy. Their solubility in water, DC conductivity in solution, and the current–voltage characteristics of the nanocomposites were studied. Furthermore, the microwave absorption at 1.0–10.0 MHz and the effects of sample thickness on the microwave absorption were investigated. The composites including higher concentration of graphite oxide showed increased solubility and electrical conductivity, and high electromagnetic shielding effectiveness. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers

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The fabrication of carbon-nanotube-coated electrodes and a field-emission-based luminescent device

Cited by 9 publications

References 12 publications

Electromagnetic interference shielding of cellulose triacetate/multiwalled carbon nanotube composite films

Electromagnetic interference shielding of cellulose triacetate/multiwalled carbon nanotube composite films

K and Au Bicatalyst Assisted Growth of Carbon Nanocoils from Acetylene: Effect of Deposition Parameters on Field Emission Properties

Microstructural and microwave shielding characteristics of water‐soluble polypyrrole–polyvinyl alcohol–graphite oxide core–shell nanocomposites

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