Preparation of Multiwall Carbon Nanotubes with Zinc Phthalocyanine Hybrid Materials and Their Nonlinear Optical (NLO) Properties.

Hybrid material of multi walled carbon nanotubes (MWCNT)-zinc phthalocyanine (ZnPcs) (MWCNT-ZnPc) composites were synthesized and compared with ZnPc. Nonlinear optical properties of MWCNT-ZnPc and ZnPc were studied. The synthesized MWCNT-ZnPc characterized by UV-visible absorption spectroscopy, photoluminescence and TEM. Their nonlinear optical properties were measured through Z-scan technique with 800 nm, 110 fs, 1 kHz Ti:Sapphire laser and 532 nm, 30 ps and 10 Hz Nd:YAG laser. The results showed that phthalocyanines were anchored onto the surface of the multi walled carbon nanotubes by using TEM. Photoluminescence spectra had shown quenching in emission of MWCNT-ZnPcs hybrid material due to the energy transfer. Reverse saturable absorption in MWCNT-ZnPcs hybrid material was compared with pure phthalocyanine, which had shown an increase in nonlinear absorption coefficient with 532 nm and reduction with 800 nm. The results concluded that MWCNT and MWCNT-ZnPc can be used as effective optical limiters.