Abstract
Polyaspartic acid (PAsp) was tagged with rhodamine isothiocyanate (Rhod) or phenyl isothiocyanate (PITC) and used for adsorption on single-walled carbon nanotubes (SWNTs) to facilitate homogenous dispersion of SWNTs in water. Results from UV-vis, FTIR-spectroscopic and Raman-spectroscopic studies and fluorescence measurements show considerable interaction between SWNTs and fluorophores immobilized on PAsp. The images from atomic force microscopy and transmission electron microscopy also indicate the presence of adsorbed polymers on the surface of SWNTs. The results suggest that the PITC-tagged PAsp is the most effective compound among the three compounds investigated for dispersing and debundling SWNTs in aqueous solutions, and the aqueous solutions are stable for months.
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