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ABSTRACT: HiPco and Arc-made single-walled carbon nanotubes (SWCNTs) were incorporated into silica matrices via a conventional sol-gel method to form SWCNTs/silica composites. Optical absorption and FT-Raman spectroscopy revealed that purification process using acid treatment resulted in preferential removal of metallic SWCNTs and severe damage and/or side-wall functionalization of HiPco SWCNTs. Z-scan measurements of SWCNTs/silica composites showed self-defocusing and bleached absorption phenomena which indicated that both the real and imaginary parts of X<sup>3</sup>, the third-order nonlinear optical susceptibility, of these composites had negative sign.
Nano/Micro Engineered and Molecular Systems, 2007. NEMS '07. 2nd IEEE International Conference on; 02/2007