Low-energy electron irradiation of preheated and gas-exposed single-wall carbon nanotubes

Abstract

Ecton, Philip A. Low-Energy Electron Irradiation of Preheated and Gas-Exposed Single-Wall Carbon Nanotubes. Doctor of Philosophy (Physics), December 2016, 110 pp., 53 figures, 40 numbered references, bibliography.We investigate the conditions under which electron irradiation of single-walled carbon nanotube (SWCNT) bundles with 2 keV electrons produces an increase in the Raman D peak.We find that an increase in the D peak does not occur when SWCNTs are preheated in situ at 600 C for 1 h in ultrahigh vacuum (UHV) before irradiation is performed. Exposing SWCNTs to air or other gases after preheating in UHV and before irradiation results in an increase in the D peak. Small diameter SWCNTs that are not preheated or preheated and exposed to air show a significant increase in the D and G bands after irradiation. X-ray photoelectron spectroscopy shows no chemical shifts in the C1s peak of SWCNTs that have been irradiated versus SWCNTs that have not been irradiated, suggesting that the increase in the D peak is not due to chemisorption of adsorbates on the nanotubes.

Damage and recovery induced by a high energy e-beam in a silicon nanofilm

“…1(d) is the HREM image aer electron irradiation, indicating an amorphous structure. Since electron beam irradiation could induce deposition of hydrocarbons or other contaminants, [28][29][30][31] we used electron energy loss spectrometry (EELS) to detect the elements of the sample before or aer electron beam irradiation. Fig.…”