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Covalent linking of 5,10,15,20  meso  tetra(4-aminophenyl) porphyrin (TAP) and its zinc complex with single-walled carbon nanotubes (SWCNTs) (nanohybrids  A  and  B , respectively) has been reported. Significant decrease in the intensity of D-band and higher frequency shift of G-band of SWCNT-TAP in Raman spectrum reveals the improved graphitic sp 2  hybridization of SWCNT as compared to SWCNT-ZnTAP. This is due to the functionalization of free base porphyrin (electron donating group) in the nanohybrid  A . Shifting of carbonyl stretching frequency from 1700 cm −1  to 1680 cm −1  and further appearance of striking bands in the X-ray photoelectron spectroscopy (XPS) and FTIR spectra of nanohybrids  A  and  B  confirm the covalent linking of porphyrin chromophores with SWCNTs. XPS reveals that the extent of functionalization of nanohybrid  A  is more as compared to nanohybrid  B . These nanohybrids demonstrate positive solvatochromism. Upon excitation at 450 nm, the nanohybrids  A  and  B  reveal ∼76% and 65% fluorescent quenching of emission bands at 686 and 632 nm, respectively. This is due to the energy or electron transfer from porphyrins to SWCNTs.

Covalent functionalization of single-walled carbon nanotubes using meso -tetra(4-aminophenyl) porphyrin and its zinc complex