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Reference standard for carbonaceous impurity measurements in carbon nanotubes.Near-infrared spectroscopy is a convenient tool for measuring nanotube/carbonaceous impurities ratios in carbon nanotube samples. These measurements are based on separation of contributions from nanotubes and impurities to the near-infrared absorption of samples dispersed in DMF, and sample purity is expressed relative to some reference sample. In the current work we produced a reference standard for NIR measurements using purified laser nanotubes. The sample was oxidized slowly using a Temperature Programmed Oxidation (TPO) setup in 2% oxygen/98% helium atmosphere. In these conditions, the sample oxidized in several steps, which were attributed to carbonaceous impurities, nanotubes and graphitic shells based on TEM and Raman observations. Stopping oxidation at 625 C (this temperature is sample-specific) allowed us to produce a sample with no carbonaceous impurities and well-defined ratio of nanotubes, graphite and metal catalyst. Since carbonaceous impurities no longer hold nanotubes and particles together, further centrifuging allowed us to remove particles and use this sample as a reference standard in NIR measurements.
Document ID
20060013466
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Nikolaev, Pavel
(GB Technology, Inc. Houston, TX, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2004
Subject Category
Chemistry And Materials (General)
Meeting Information
Meeting: Material Research Society Fall 2004
Location: Boston, MA
Country: United States
Start Date: November 29, 2004
End Date: December 3, 2004
Funding Number(s)
CONTRACT_GRANT: NAS9-19100
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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