Enhanced Nonlinear Absorption Performance of Reduced Graphene Oxide Nanohybrid Covalently Functionalized by Porphyrin via 1,3-Dipolar Cycloaddition

Abstract

Porphyrin-functionalized reduced graphene oxide (RGO-TPP) was prepared by 1,3-dipolar cycloaddition reaction and characterized by Fourier transform infrared spectroscopy, Raman, ultraviolet/visible absorption, fluorescence, and transmission electron microscopy. At the same level of linear transmittance, RGO-TPP exhibited more enhanced optical nonlinearities than RGO and the pristineporphyrin, implying a remarkable accumulation effect as a result of the covalent link between RGO and porphyrin. The role of energy/electron transfer in the optical nonlinearities of RGO-TPP was investigated by fluorescence and Raman spectroscopy. All the results displayed that RGO can be covalently functionalized with porphyrins by the proposed approach.

Shape‐controlled synthesis of polyaniline and its synergistic effect with reduced graphene oxide for the fabrication of flexible electrode

“…Apparently, it is the interaction between the PANI and rGO that has promotes the delocalization of electrons from the polymer backbone, which subsequently increase the electrical conductivity. 72,73 In conclusion, the electrode film composed of a rGO/PANI mass ratio of 0.5 gave the lowest specific resistivity. The specific resistivity result obtained in this work followed a fairly similar pattern with the electrical conductivity result published by.…”

“…In contrast, the resistivity of pure PANI electrode film (i.e., rGO mass ratio = 0) was determined to be 0.029 ± 0.003 Ωcm, which is slightly higher than that in rGO‐PANI composite. Apparently, it is the interaction between the PANI and rGO that has promotes the delocalization of electrons from the polymer backbone, which subsequently increase the electrical conductivity 72,73 …”

NLOphoric Azo Dyes Studied Using Z‐Scan

“…Organic materials are the strongest NLOphores. They have advantages, including versatile molecular designs, lower dielectric constants, optical transparencies, resistance to electromagnetic wave interference, high reaction frequencies, and the ability to tune the electronic polarization of π‐electrons by structural modification [5–11] . Higher NLO responses of donor‐ п‐ acceptors based organic systems are intrinsically associated with high intramolecular charge transfer (ICT) [12–14] and dipole moments [15,16] at excited states.…”

“…They have advantages, including versatile molecular designs, lower dielectric constants, optical transparencies, resistance to electromagnetic wave interference, high reaction frequencies, and the ability to tune the electronic polarization of π-electrons by structural modification. [5][6][7][8][9][10][11] Higher NLO responses of donor-пacceptors based organic systems are intrinsically associated with high intramolecular charge transfer (ICT) [12][13][14] and dipole moments [15,16] at excited states. Other significant elements that affect NLO responses include cooperative enhancing effect through electronic and vibronic coupling and molecular coplanarity.…”