Direct growth method of carbon nanotubes onto a tungsten tip for field emitter fabrication

Polymer grafting from graphitic carbon materials has been explored for several decades. Currently existing methods mostly employ harsh chemical treatment to generate defect site in graphitic carbon plane, which are used as active site for polymerization of precursors. Unfortunately, the treatment cause serious degradation of chemical structure and material properties. Here, we present a straightforward route for growth of polyaniline chain from nitrogen (N)-sites of carbon nanotubes. N site in the CNT wall initiates the polymerization of aniline monomer, which generates seamless hybrids composed of polyaniline directly grafted onto the CNT walls. The synthesized hybrids show excellent synergistic electrochemical performance, and are employed for electrodes of pseudo-capacitor. This approach offers an efficient way to obtain hybrid system consisting of conducting polymers directly grafted from graphitic dopant sites.

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Surface Smoothness Effect for the Direct Growth of Carbon Nanotubes on Bulk FeCrAl Metal Substrates

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2010.1991 ◽

2010 ◽

Vol 10 (6) ◽

pp. 4082-4088 ◽

Cited By ~ 8

Author(s):

Michael M. Oye ◽

Setha Yim ◽

Alan Fu ◽

Kevin Schwanfelder ◽

M. Meyyappan ◽

...

Keyword(s):

Carbon Nanotubes ◽

Surface Smoothness ◽

Metal Substrates ◽

Direct Growth

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N-Dopant-Mediated Growth of Metal Oxide Nanoparticles on Carbon Nanotubes

Nanomaterials ◽

10.3390/nano11081882 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1882

Author(s):

Jin Ah Lee ◽

Won Jun Lee ◽

Joonwon Lim ◽

Sang Ouk Kim

Keyword(s):

Carbon Nanotubes ◽

Metal Oxide ◽

Carbon Nanomaterials ◽

Wide Spectrum ◽

Metal Oxide Nanoparticles ◽

Nucleation And Growth ◽

Oxide Nanoparticles ◽

Metal Oxide Nanoparticle ◽

Nucleation Sites ◽

Direct Growth

Metal oxide nanoparticles supported on heteroatom-doped graphitic surfaces have been pursued for several decades for a wide spectrum of applications. Despite extensive research on functional metal oxide nanoparticle/doped carbon nanomaterial hybrids, the role of the heteroatom dopant in the hybridization process of doped carbon nanomaterials has been overlooked. Here, the direct growth of MnOx and RuOx nanoparticles in nitrogen (N)-doped sites of carbon nanotubes (NCNTs) is presented. The quaternary nitrogen (NQ) sites of CNTs actively participate in the nucleation and growth of the metal nanoparticles. The evenly distributed NQ nucleation sites mediate the generation of uniformly dispersed <10 nm diameter MnOx and RuOx nanoparticles, directly decorated on NCNT surfaces. The electrochemical performance of the resultant hybridized materials was evaluated using cyclic voltammetry. This novel hybridization method using the dopant-mediated nucleation and growth of metal oxides suggests ways that heteroatom dopants can be utilized to optimize the structure, interface and corresponding properties of graphitic carbon-based hybrid materials.

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Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.7.72 ◽

2016 ◽

Vol 7 ◽

pp. 809-816 ◽

Cited By ~ 4

Author(s):

Majid K Abyaneh ◽

Pietro Parisse ◽

Loredana Casalis

Keyword(s):

Gold Nanorods ◽

Growth Control ◽

Weight Ratio ◽

Polymer Nanocomposite ◽

Gold Salt ◽

Aspect Ratios ◽

Direct Formation ◽

Growth Method ◽

Direct Growth ◽

Gold Seed

Herein, we present the formation of gold nanorods (GNRs) on novel gold–poly(methyl methacrylate) (Au–PMMA) nanocomposite substrates with unprecedented growth control through the polymer molecular weight (M w) and gold-salt-to-polymer weight ratio. For the first time, GNRs have been produced by seed-mediated direct growth on surfaces that were pre-coated with polymer-immobilised gold seeds. A Au–PMMA nanocomposite formed by UV photoreduction has been used as the gold seed. The influence of polymer M w and gold concentration on the formation of GNRs has been investigated and discussed. The polymer nanocomposite formed with a lower M w PMMA and 20 wt % gold salt provides a suitable medium for growing well-dispersed GNRs. In this sample, the average dimension of produced GNRs is 200 nm in length with aspect ratios up to 10 and a distribution of GNRs to nanoparticles of nearly 22%. Suitable characterization techniques such as AFM and SEM have been used to support concept of the proposed growth method.

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Direct growth of vertically aligned carbon nanotubes on stainless steel by plasma enhanced chemical vapor deposition

Diamond and Related Materials ◽

10.1016/j.diamond.2018.10.012 ◽

2018 ◽

Vol 90 ◽

pp. 144-153 ◽

Cited By ~ 6

Author(s):

Arun Thapa ◽

Suman Neupane ◽

Rui Guo ◽

Katherine L. Jungjohann ◽

Doug Pete ◽

...

Keyword(s):

Carbon Nanotubes ◽

Stainless Steel ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Chemical Vapor ◽

Vertically Aligned Carbon Nanotubes ◽

Aligned Carbon Nanotubes ◽

Direct Growth ◽

Vertically Aligned

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Nanocone-Shaped Carbon Nanotubes Field-Emitter Array Fabricated by Laser Ablation

Nanomaterials ◽

10.3390/nano11123244 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3244

Author(s):

Jiuzhou Zhao ◽

Zhenjun Li ◽

Matthew Thomas Cole ◽

Aiwei Wang ◽

Xiangdong Guo ◽

...

Keyword(s):

Carbon Nanotubes ◽

Laser Ablation ◽

High Performance ◽

Low Cost ◽

Field Emitter ◽

Beam Focusing ◽

Field Emitter Arrays ◽

Emitter Array ◽

Field Emitter Array ◽

Tip Radius

The nanocone-shaped carbon nanotubes field-emitter array (NCNA) is a near-ideal field-emitter array that combines the advantages of geometry and material. In contrast to previous methods of field-emitter array, laser ablation is a low-cost and clean method that does not require any photolithography or wet chemistry. However, nanocone shapes are hard to achieve through laser ablation due to the micrometer-scale focusing spot. Here, we develop an ultraviolet (UV) laser beam patterning technique that is capable of reliably realizing NCNA with a cone-tip radius of ≈300 nm, utilizing optimized beam focusing and unique carbon nanotube–light interaction properties. The patterned array provided smaller turn-on fields (reduced from 2.6 to 1.6 V/μm) in emitters and supported a higher (increased from 10 to 140 mA/cm2) and more stable emission than their unpatterned counterparts. The present technique may be widely applied in the fabrication of high-performance CNTs field-emitter arrays.

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