Excimer Laser Treatment for Purification of Bulk Carbon Single-Walled Nanotubes and Damage of Carbon Allotropes
Katie Hurst, Darryl A. Keenan, Anne Dillon, John H. Lehman
Laser treatment of bulk carbon single-walled nanotubes (SWNTs) using an excimer laser is demonstrated as a potentially simple and fast purification method. Quantitative evidence for the selective removal of carbon impurities without destruction of nanotubes is shown by the decrease in the full width at half maximum of the Raman D-band for increasing fluence level, without changing the diameter distribution of the nanotube sample. Qualitative changes in the topology and morphology upon exposure are also shown by scanning electron microscopy. A 5 % change in responsivity of a pyroelectric detector coated with SWNTs is presented as a novel assessment of the change in SWNT coating topology. In the context of damage mechanisms, the resonance of the incident photons and the pi-plasmon in the SWNT material is proposed as a theoretical basis for understanding the solid state properties of the SWNT versus the carbon allotropes. The interaction of both 248 nm and 193 nm incident photons with the SWNT material is considered. Additionally, exposure of the nanotube samples in air and in an inert atmosphere provides insight into the possible mechanism of purification.
September 25-27, 2006
Boulder, CO, USA
Boulder Damage Symposium Annual Symposium on Optical Materials for High-Power Lasers
, Keenan, D.
, Dillon, A.
and Lehman, J.
Excimer Laser Treatment for Purification of Bulk Carbon Single-Walled Nanotubes and Damage of Carbon Allotropes, Boulder Damage Symposium Annual Symposium on Optical Materials for High-Power Lasers, Boulder, CO, USA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32347
(Accessed December 6, 2023)