Effects of adsorbed O2, H2, CO2 and H2O on the optical properites of pure and polymer encapsulated single walled carbon nanotubes
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Date
2002-03-18Author
Gennett, Thomas
Roe, Jo
VanDerveer, William
Fever, Adam
Landi, Brian
Raffaelle, Ryne
Alleman, Jeffrey
Dillon, Anne
Heben, Michael
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We have measured the optical absorption spectra of single wall carbon nanotubes (SWCNTs) and SWCNT-polymer matrix samples at several temperatures and pressures. An in-situ cell was designed that allowed for heating of samples to 400 ^oC in vacuo (10-3 torr) was employed. Gases of interest were then introduced without re-exposure to atmosphere. The shifts in the magnitude and energy of the electronic transitions for both raw and pure SWCNT soots will be discussed. In the case of SWCNT-Polymer composites the thin films of homogenous solutions were spray-coated onto a quartz plate. The ability of the various polymers to coordinate to he nanotube helical structure appeared to have a direct affect on the SWCNT optical absorption spectra. The effect of both hydrophobic and hydrophilic polymers on the electronic transition of the SWCNTs will be presented.
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