Spectroscopic Evaluation of the Length of Polyethylene glycol) Covalentl Attached to Multiwalled Carbon Nanotubes

摘要

Multiwalled carbon nanotubes (MWNTs) were covalently functionalized by polyethylene glycol) (PEG) of different molecular weights. The lengths of the PEG on each sample were evaluated using 1-naphthol as a fluorescence probe. The intensity of ion-pair fluorescence of the 1-naphthol increased with the length of the attached PEG due to interaction between the 1-naphthol and ether groups of the PEG. This increase indicated that fluorescence measurement using 1-naphthol is an excellent tool to evaluate the length of PEG on the MWNTs.