• M ARJUN

      Articles written in Journal of Chemical Sciences

    • Synthesis, characterization and photoluminescence properties of tetra(aminophenyl) porphyrin covalently linked to multi-walled carbon nanotubes

      G PRABHAVATHI M ARJUN R YAMUNA

      More Details Abstract Fulltext PDF

      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. ThisMWCNT-TAP hybrid was characterized by Raman, Fourier transform infrared (FT-IR), Transmissionelectron 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. Fluorescencequenching 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.

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