The effects of alpha- and beta-amino substituents of phthalocyanine on photophysical and nonlinear optical properties of graphene oxide-tetraamino zinc(II) phthalocyanine hybrids

摘要

Two kinds of metameric tetra-amino-phthalocyanine zinc (ZnTAPc) bearing peripherally and non peripherally substituent groups connected to graphene oxide (GO) has been synthesized via covalent functionalized reaction. A series of characterizations including X-ray photoelectron spectroscopy, Fourier transform infrared spectra, Raman spectra, thermogravimetric analysis and ultraviolet visible absorption confirm that the two kinds of ZnTAPc are grafted onto the GO nanosheets successfully. The fluorescence spectra show strong fluorescence quenching by the photo-induced electron transfer (PET) process between ZnTAPc moieties and GO nanosheets, and the possibility of the PET process has been further proved using the thermodynamic method. The nonlinear optical (NLO) properties of the two kinds of hybrid material were investigated using the Z-scan technique at the wavelength Of 532 nm in the nanosecond scale. The GO-beta-ZnTAPc hybrid possesses much stronger nonlinear absorption effect than GO-cc-ZnTAPc hybrid, showing that the position of substituent have a significant influence on the NLO properties of aforementioned hybrids. (C) 2016 Elsevier B.V. All rights reserved.