NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 17 of 112
Purification process for vertically aligned carbon nanofibers
External Online Source: doi:10.1166/jnn.2003.178
Author and Affiliation:
Nguyen, Cattien V.(NASA Ames Research Center, Moffett Field CA United States)
Delziet, Lance
Matthews, Kristopher
Chen, Bin
Meyyappan, M.
Abstract: Individual, free-standing, vertically aligned multiwall carbon nanotubes or nanofibers are ideal for sensor and electrode applications. Our plasma-enhanced chemical vapor deposition techniques for producing free-standing and vertically aligned carbon nanofibers use catalyst particles at the tip of the fiber. Here we present a simple purification process for the removal of iron catalyst particles at the tip of vertically aligned carbon nanofibers derived by plasma-enhanced chemical vapor deposition. The first step involves thermal oxidation in air, at temperatures of 200-400 degrees C, resulting in the physical swelling of the iron particles from the formation of iron oxide. Subsequently, the complete removal of the iron oxide particles is achieved with diluted acid (12% HCl). The purification process appears to be very efficient at removing all of the iron catalyst particles. Electron microscopy images and Raman spectroscopy data indicate that the purification process does not damage the graphitic structure of the nanotubes.
Publication Date: Feb 01, 2003
Document ID:
20040087566
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Journal of nanoscience and nanotechnology (ISSN 1533-4880); Volume 3; 1-2; 121-5
Publisher Information: United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CARBON; CARBON NANOTUBES; CRYSTALLIZATION; NANOTECHNOLOGY; PURIFICATION; CATALYSIS; HEAT; IRON; IRON COMPOUNDS; MACROMOLECULES; MOLECULAR STRUCTURE; OXIDATION-REDUCTION REACTIONS; QUALITY CONTROL; SURFACE PROPERTIES; TEMPERATURE; VAPORIZING
Other Descriptors: CRYSTALLIZATION/METHODS; NANOTECHNOLOGY/METHODS; NANOTUBES, CARBON/CHEMISTRY/ISOLATION & PURIFICATION; CATALYSIS; FERRIC COMPOUNDS/CHEMISTRY; HEAT; IRON/CHEMISTRY; MACROMOLECULAR SYSTEMS; MOLECULAR CONFORMATION; OXIDATION-REDUCTION; PRESSURE; QUALITY CONTROL; SUPPORT, U.S. GOV'T, NON-P.H.S; SUPPORT, U.S. GOV'T, P.H.S; SURFACE PROPERTIES; TEMPERATURE; VOLATILIZATION
Availability Source: Other Sources
› Back to Top
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 23, 2011
Contact Us