Interaction of aluminum hydroxide phthalocyanine with carbon nanomaterials in ethylic solution

CURCIO, SERGIO FERNANDO

Congreso; XVIII Brasil MRS Metting; 2019

The photophysical properties of the aluminum hydroxide phthalocyanine solution (AlOHPc) in alcohol solution were performed in the presence of carbon nanomaterials, such as: Multi-Walled Carbon nanotube functionalized with Carboxylic acid (MWCNT-COOH), Multi-Walled Carbon nanotube functionalized (MWCNT), Fullerene C60 pyrrolidine tris-acid ethyl ester (C60 functionalized), Fullerene C60 (C60). The materials were initially solubilized in ethanol and posteriorly parts of glycerol were added for the purpose of to increase the viscosity of the medium. The electronic absorption and fluorescence analyses of the molecule of aluminum hydroxide phthalocyanine with different concentrations of the nanomaterials were fulfilled in order to understand the nature of the molecular interaction between them. The absorption spectra showed the emergence of new bands in the region at 716nm for both MWCNT-COOH and MWCNT, suggesting the formation of non-fluorescent complexes between AlOHPc and carbon nanotubes in the ground state. For the fullerenes C60 functionalized and C60 were not observed the emergence of the new band at 716nm region. Stationary fluorescence analysis revealed the quenching of the fluorescence of AlOHPc by nanomaterials. Analysis of the Stern-Volmer plot and the excited-state lifetime of AlOHPc with carbon nanotubes revealed the simultaneous occurrence of both static and dynamic fluorescence quenching mechanism due to the formation of non-fluorescent complexes and collisional process. Due the increasing the viscosity of the medium by adding glycerol, the dynamic fluorescence quenching mechanism was inhibit, evidencing only the existence of the static fluorescence quenching mechanism by complex formation. For AlOHPc solution with the C60 functionalized and the C60 were identified only the occurrence of static quenching mechanism by sphere of effective quenching.