Synthesis of a new nano hybrid of 5,10,15,20-mesotetra(4-aminophenyl) porphyrin (TAP)
functionalized with multi-walled carbon nanotubes (MWCNTs) through an amide linkage is reported for the first
time. This MWCNT-TAP hybrid was characterized by Raman, Fourier transform infrared (FT-IR), Transmission
electron microscopy (TEM), Thermogravimetric analysis (TGA), absorption and emission spectroscopy. TGA
analysis reveals that there is a ∼60% weight loss when heated from 150–750◦C, which is attributed to the amount
of TAP molecules that were attached to MWCNTs. Electronic properties of MWCNTs were improved in the
hybrid compared to raw MWCNTs as evidenced by Raman spectra. The absorption and emission spectra of
TAP and nano-hybrid indicate strong positive solvatochromism with increasing solvent polarity. Fluorescence
quenching of TAP in different solvents were observed in the emission spectra in the MWCNT-TAP hybrid,
indicating that covalent functionalization facilitated effective energy or electron transfer from porphyrin moiety
to the MWCNT.
G. Prabhavathi, Arjun, M., and Yamuna, R., “Synthesis, Characterization and Photoluminescence Properties of Tetra-amino Phenylporphyrin Covalently Linked to Multi-Walled Carbon Nanotubes”, Journal of chemical sciences, vol. 129, 6 vol., pp. 699–706, 2017.