Field emission from nanoforest carbon nanotubes grown on cobalt-containing amorphous carbon composite films

Zhang, Y. B.; Lau, Shu Ping; Li, H. F.

doi:10.1063/1.2434830

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…[189] Nanoforest (Figure 31), as a conglomerate of nanotrees and/or nanobushes and another "nanovegetation" above, was reported for carbon nanotubes. [190,191] It was prepared by biased thermal CVD on Co-containing amorphous C composite films. The nanoforest multiwalled CNTs have thin diameters between 10 and 20 nm.…”

Section: Gallery Of Relatively Rare Nanoformsmentioning

confidence: 99%

A Review on Less-common Nanostructures

Kharissova

Kharisov

García

et al. 2009

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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Less-comon nanostructures (nanoforms) such as "nanodumbbells", "nanorices", "nanolines", "nanotowers", "nanoshuttles", "nanobowlings", "nanowheels", "nanofans", "nanopencils", "nanotrees", "nanoarrows", "nanonails", "nanobottles", or "nanovolcanoes", among many others, have been reviewed. A considerable part of these nanoforms corresponds to gold, zinc oxide, and several binary inorganic compounds that are widely used in electronics. Synthesis methods for obtaining less-common nanoforms include wet-chemistry and electrochemical techniques, laser ablation, ultrasonic treatment, electron and ion beam irradiation, arc discharge, lithography, CVD and related routes, among others.

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Section: Gallery Of Relatively Rare Nanoformsmentioning

confidence: 99%

A Review on Less-common Nanostructures

Kharissova

Kharisov

García

et al. 2009

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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show abstract

“…Nanoforests (Figures 6b and 14), as a conglomerate of nanotrees above and/or nanobushes and other "nanovegetation" described below, as well as simple nanorods and nanowires, have been reported mainly for carbon nanotubes. 75 A key growth precursor for SWCNTs is acetylene, 76 although ethylene mixtures with H 2 77 (the equipment is shown in Figure 15) or C 2 H 4 /H 2 /H 2 O/Ar 78 were used, mainly by CVD technique. Thus, CNTs nanoforest was prepared 79 by biased thermal CVD on Co-containing amorphous C composite films.…”

Section: Introductionmentioning

confidence: 99%

Less-Common Nanostructures in the Forms of Vegetation

Kharissova

Kharisov

2010

Ind. Eng. Chem. Res.

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Nanostructures in the forms of varieties of vegetation are reviewed, in particular nanotrees and their agglomerates, nanobushes, nanomushrooms, nanoflowers, nanograss, and nanosheafs, among many others. Synthesis methods, influence of reaction conditions on the structural types of products, properties, formation mechanisms, and current and future applications are discussed. These nanostructures possess a series of useful properties (magnetic, semiconducting, field-emission, etc.) and applications, mainly in catalysis, as well as for creation of nanomaterials, solar cells, and in medicine for tumor treatments, among other uses.

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“…When the calcination temperature is lower (CoNC-800A-700), only folded, overlapping GF sheets can be seen in Figure 4 b. Some carbon materials develop into curved CNTs using Co centers as the starting seeds [ 21 , 22 , 23 ] at higher temperatures and generate more micropores and mesopores, as shown in Figure 4 d,f. The inset Figure 4 g clearly illustrates the formation of curved CNTs from cup-to-cup stacking of carbons [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

Cobalt-Based Cathode Catalysts for Oxygen-Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Hsieh¹,

Wang²,

Ho³

2022

Membranes

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A novel cobalt-chelating polyimine (Co-PIM) containing an additional amine group is prepared from the condensation polymerization of diethylene triamine (DETA) and terephthalalehyde (PTAl) by the Schiff reaction. A Co, N-co-doped carbon material (Co-N-C), obtained from two-stage calcination in different gas atmospheres is used as the cathode catalyst of an anion exchange membrane fuel cell (AEMFC). The Co-N-C catalyst demonstrates a CoNx-type single-atom structure seen under high-resolution transmission electron microscopy (HRTEM). The Co-N-C catalysts are characterized by FTIR, XRD, and Raman spectroscopy as well. Their morphologies are also illustrated by SEM and TEM micrographs, respectively. Surface area and pore size distribution are found by BET analysis. Co-N-C catalysts exhibit a remarkable oxygen reduction reaction (ORR) at 0.8 V in the KOH(aq). From the LSV (linear-sweeping voltammetry) curves, the onset potential relative to RHE is 1.19–1.37 V, the half wave potential is 0.73–0.78 V, the Tafel slopes are 76.9–93.6 mV dec−1, and the average number of exchange electrons is 3.81. The limiting reduction current of CoNC-1000A-900 is almost the same as that of commercial 20 wt% Pt-deposited carbon particles (Pt/C), and the max power density (Pmax) of the single cell using CoNC-1000A-900 as the cathode catalyst reaches 361 mW cm−2, which is higher than Pt/C (284 mW cm−2).

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Field emission from nanoforest carbon nanotubes grown on cobalt-containing amorphous carbon composite films

Cited by 7 publications

References 21 publications

A Review on Less-common Nanostructures

A Review on Less-common Nanostructures

Less-Common Nanostructures in the Forms of Vegetation

Cobalt-Based Cathode Catalysts for Oxygen-Reduction Reaction in an Anion Exchange Membrane Fuel Cell

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