Atomic-Scale In-situ Observation of Carbon Nanotube Growth from Solid State Iron Carbide Nanoparticles

Nano Letters ◽  
2008 ◽  
Vol 8 (7) ◽  
pp. 2082-2086 ◽  
Author(s):  
Hideto Yoshida ◽  
Seiji Takeda ◽  
Tetsuya Uchiyama ◽  
Hideo Kohno ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotube ◽  
Solid State ◽  
Iron Carbide ◽  
Atomic Scale ◽  
In Situ Observation ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

In Situ Observation of Nucleation and Growth of Carbon Nanotubes from Iron Carbide Nanoparticles

2008 ◽  
Vol 1142 ◽  
Author(s):  
Hideto Yoshida ◽  
Seiji Takeda ◽  
Tetsuya Uchiyama ◽  
Hideo Kohno ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotubes ◽  
Iron Carbide ◽  
Bulk Diffusion ◽  
Chemical Vapor ◽  
Nucleation And Growth ◽  
Atomic Scale ◽  
In Situ Observation ◽  
Transmission Electron ◽  
Cvd Growth

ABSTRACTNucleation and growth processes of carbon nanotubes (CNTs) in iron catalyzed chemical vapor deposition (CVD) have been observed by means of in-situ environmental transmission electron microscopy. Our atomic scale observations demonstrate that solid state iron carbide (Fe3C) nanoparticles act as catalyst for the CVD growth of CNTs. Iron carbide nanoparticles are structurally fluctuated in CVD condition. Growth of CNTs can be simply explained by bulk diffusion of carbon atoms since nanoparticles are carbide.

Atomic-Scale Analysis on the Role of Molybdenum in Iron-Catalyzed Carbon Nanotube Growth

Nano Letters ◽  
2009 ◽  
Vol 9 (11) ◽  
pp. 3810-3815 ◽  
Author(s):  
Hideto Yoshida ◽  
Takuma Shimizu ◽  
Tetsuya Uchiyama ◽  
Hideo Kohno ◽  
Yoshikazu Homma ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Atomic Scale ◽  
Scale Analysis ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

Carbon Nanotube-Based Vacuum Microelectronic Gated Cathode

1998 ◽  
Vol 509 ◽  
Author(s):  
Xueping Xu ◽  
George R. Brandes
Keyword(s):  
Carbon Nanotube ◽  
Emission Current Density ◽  
Growth Step ◽  
Vacuum Microelectronics ◽  
Field Emitters ◽  
Vacuum Microelectronic ◽  
Microelectronics Fabrication ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

AbstractA vacuum microelectronic device containing carbon nanotube electron field-emitters was developed and tested. The gated cathode was fabricated using conventional microelectronics fabrication techniques and a final, self-aligned, in situ carbon nanotube growth step. To our knowledge, this is the first vacuum microelectronics device with carbon nanotube field-emitters grown in situ with a catalytic growth process. The turn-on voltage of the cathode was less than 20 volts and the emission current density at 50 volts was as high as 9 mA-cm−2. The fabrication process, device performance, manufacturing issues and cathode applications will be discussed.

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

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.

Understanding the Carbon Nanotube Growth Mechanism by In-Situ Microscopy

2004 ◽  
Vol 10 (S02) ◽  
pp. 368-369 ◽  
Author(s):  
Renu Sharma
Keyword(s):  
Carbon Nanotube ◽  
Growth Mechanism ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Functionalisation of Microfluidic Channels with In Situ Grown Carbon Nanotubes

2005 ◽  
Vol 872 ◽  
Author(s):  
K. Gjerde ◽  
T. Schurmann ◽  
K.B.K. Teo ◽  
M. Aono ◽  
W.I. Milne ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Surface Properties ◽  
Microfluidic Channels ◽  
Electrical Field ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Local Distortions

AbstractWe present a new route towards customizing the surface properties of microfluidic channels, by a forest of in situ grown multiwalled carbon nanotubes (CNT). Local distortions of the electrical field direction are used to control the direction of the carbon nanotube growth.

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