Direct growth of multiwall carbon nanotube on metal catalyst by chemical vapor deposition: In situ nucleation

Chemical vapor deposition (CVD) of Ni, Pd, and Pt films and of Ni/Pd and Pd/Pt bimetallic films on multiwall carbon nanotubes (MWCNTs) can be effected at low temperature if the nanotubes are pretreated by CVD of titanium carbide. In the absence of the pretreatment, the CVD leads to formation of isolated nanoparticles of the nickel-group metals. The metallized MWCNTs are curved or kinked, as a result of the interaction with the metal. Preliminary oxidation of the carbon nanotubes allows easier metallization, and the bending of the metallated nanotubes is not observed in this case.Key words: Chemical vapor deposition, platinum, palladium, nickel, carbon, nanotube.

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Optimization of Chemical Vapor Deposition Synthesis Conditions for Multiwall Carbon Nanotube by Statistical Analysis of Experiment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.55-57.533 ◽

2008 ◽

Vol 55-57 ◽

pp. 533-536

Author(s):

P. Saiprasert ◽

D. Koolpiruck ◽

S. Chiangga

Keyword(s):

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Multiwall Carbon Nanotubes ◽

Statistical Design ◽

Chemical Vapor ◽

Multiwall Carbon Nanotube ◽

Synthesis Conditions ◽

Fourier Transform Raman ◽

Multiwall Carbon

The optimization of chemical vapor deposition synthesis conditions for multiwall carbon nanotubes (MWCNTs) was experimentally investigated. Carbon nanotubes were grown on cobalt substrate thicknesses of 20, 100 and 1000 nm at 700 and 900 0C with 2 replications. The configuration and morphology of the carbon nanotubes were investigated by scanning electron microscope and Fourier transform raman spectrometer, respectively. The tendency of the parameters was evaluated by statistical design of experiment. Observations on samples produced under our optimised production process, showed that a large number of MWCNTs bundles were produced. Diameter of MWCNTs bundles ranges between 30 and 100 nm throughout the samples. From the variance analysis of the Raman spectra we observe that the thickness of cobalt and temperature of synthesis are highly significant in which the coherence length and innermost diameter increase for either the thickness increases or the temperature decreases.

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Position-Controlled Carbon Nanotube Field-Effect Transistors Fabricated by Chemical Vapor Deposition Using Patterned Metal Catalyst

Japanese Journal of Applied Physics ◽

10.1143/jjap.42.4116 ◽

2003 ◽

Vol 42 (Part 1, No. 6B) ◽

pp. 4116-4119 ◽

Cited By ~ 35

Author(s):

Yutaka Ohno ◽

Shinya Iwatsuki ◽

Tatsuki Hiraoka ◽

Toshiya Okazaki ◽

Shigeru Kishimoto ◽

...

Keyword(s):

Chemical Vapor Deposition ◽

Carbon Nanotube ◽

Vapor Deposition ◽

Field Effect ◽

Field Effect Transistors ◽

Chemical Vapor ◽

Metal Catalyst

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In Situ Measurement of Carbon Nanotube Growth Kinetics in a Rapid Thermal Chemical Vapor Deposition Reactor With Multizone Infrared Heating

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4046033 ◽

2020 ◽

Vol 8 (1) ◽

Author(s):

Moataz Abdulhafez ◽

Jaegeun Lee ◽

Mostafa Bedewy

Keyword(s):

Chemical Vapor Deposition ◽

Carbon Nanotube ◽

Vapor Deposition ◽

Chemical Vapor ◽

Infrared Heating ◽

Ex Situ ◽

Depth Of Field ◽

Carbon Nanotube Growth ◽

Nanotube Growth

Abstract Understanding and controlling the growth of vertically aligned carbon nanotube (VACNT) forests by chemical vapor deposition (CVD) is essential for unlocking their potential as candidate materials for next generation energy and mass transport devices. These advances in CNT manufacturing require developing in situ characterization techniques capable of interrogating how CNTs grow, interact, and self-assemble. Here we present a technique for real-time monitoring of VACNT forest height kinetics applied to a unique custom designed rapid thermal processing (RTP) reactor for CVD of VACNTs. While the integration of multiple infrared heating lamps enables creating designed spatiotemporal temperature profiles inside the reactor, they pose challenges for in situ measurements. Hence, our approach relies on contrast-adjusted videography and image processing, combined with calibration using 3D optical microscopy with large depth-of-field. Our work enables reliably measuring VACNT growth rates and catalytic lifetimes, which are not possible to measure using ex situ methods.

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