Preparation and characterization of ternary composite composed by chitosan, porphyrin derivative and single-walled carbon nanotubes (SWCNTs)

摘要

The functionalization of single-walled carbon nanotubes (SWCNTs) by noncovalent approach turned to be an effect strategy. Porphyrin and its derivatives are ideal materials for the decoration of SWCNTs. In this work, 5-(4-carboxypheny1)-10,15,20-triphenylporphyrin (H_2CPTPP) was synthesized and covalently combined to the chitosan. The prepared chitosan/H_2CPTPP composite was further conjugated with the oxidized SWCNTs to form chitosan/H_2CPTPP/SWCNTs ternary composite. The results indicated that the carboxyl group of H_2CPTPP was successfully introduced into the chitosan, which was confirmed by Fourier Transform infrared (FT/IR) spectroscopy, Raman shift and X-ray photoelectron spectroscopy (XPS). The solution of chitosan/H_2CPTPP/SWCNTs composite displays fluorescence quenching effect compared with that of chitosan/H2CPTPP composite at 615 nm and 654 nm upon excitation at 425nm.