Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Purification of as-prepared single-walled carbon nanotubes by pulsed excimer-laser treatment

Published

Author(s)

Katie Hurst, Anne Dillon, Shao Yang, John H. Lehman

Abstract

We investigate the purification of as-prepared single wall carbon nanotubes (SWCNTs) by exposure to pulsed 193 and 248 nm laser light, as well as lamp wavelengths of 254 and 185 nm. Raman spectroscopy before and after laser exposure indicates the removal of non-nanotube material without modification of the distribution of tube diameter for material exposed to a 248 nm laser, while 193 nm laser light does not selectively oxidize carbon impurities. The mechanism of purification is further considered in the context of atmosphere (oxygen, ozone, nitrogen or partial vacuum) and temperature (measured average and calculated maximum). A mathematical model for pulsed laser heating is used to estimate the maximum temperature achieved during laser excitation. We attribute the purification of nanotube samples to photophysical interactions of the pulsed 248 nm photons in resonance with sp2 carbon.
Citation
Journal of Physical Chemistry B
Volume
112
Issue
42

Keywords

carbon nanotube, excimer laser

Citation

Hurst, K. , Dillon, A. , Yang, S. and Lehman, J. (2008), Purification of as-prepared single-walled carbon nanotubes by pulsed excimer-laser treatment, Journal of Physical Chemistry B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32995 (Accessed February 29, 2024)
Created September 24, 2008, Updated October 12, 2021