Publication Type : Journal Article
Publisher : Journal of Nanoparticle Research
Source : Journal of Nanoparticle Research, Volume 15, Number 1 (2013)
Url : http://www.scopus.com/inward/record.url?eid=2-s2.0-84872026131&partnerID=40&md5=e111e2f4b9f6be17f5193ece293457c4
Keywords : Amides, article, atomic force microscopy, covalent bond, Covalent functionalizations, dispersion, Electron, Energy transfer, Fluorescence, Fluorescence quenching, Fourier transform infrared spectroscopy, GO-TAP hybrid, graphene oxide, High thermal stability, infrared spectroscopy, molecular interaction, NLO, Nonlinear optics, Optical limiting properties, Optical properties, Organic solvents, Photoelectrons, porphyrin derivative, Porphyrins, priority journal, Quenching, scanning electron microscopy, solubility, synthesis, Thermodynamic stability, Thermogravimetric analysis, Thermogravimetry, thermostability, thickness, transmission electron microscopy, ultraviolet spectroscopy, Ultraviolet visible spectroscopy, X ray photoelectron spectroscopy
Campus : Coimbatore
School : School of Engineering
Department : Sciences, Chemical
Verified : Yes
Year : 2013
Abstract : The synthesis of a porphyrin-graphene oxide hybrid (GO-TAP) was carried out by covalently functionalizing graphene oxide (GO) with 5,10,15,20 mesotetra (4-aminophenyl) porphyrin (TAP) through an amide linkage. The GO-TAP hybrid has been characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV-visible spectroscopy. The peak intensity of the Soret band of the material was suppressed compared to neat TAP. This indicates a strong interaction between the electronic energy level of TAP and GO in the GO-TAP hybrid. The functionalization of GO with TAP significantly improved its solubility and dispersion stability in organic solvents. Scanning electron micrographs reveal that the hybrid was found to be similar to the unmodified GO but slightly more wrinkled. Transmission electron micrographs also demonstrate that GO sheet in the hybrid is more wrinkled with some dark spot due to functionalization. Atomic force microscopy results also reveal that the TAP functionalization increases the thickness of GO sheet to 2.0-3.0 nm from 1.2 to 1.8 nm. We observed improved nonlinear optical and optical limiting properties for the hybrid compared to both graphene oxide and porphyrin. GO-TAP shows fluorescence quenching compared with porphyrin, indicating excellent electron and/or energy transfer to GO from TAP. Thermogravimetric analysis confirms that the GO-TAP hybrid has outstanding thermal stability. © 2013 Springer Science+Business Media Dordrecht.
Cite this Research Publication : Dr. Yamuna R., Ramakrishnan, Sb, Keerthy Dhara, Devi, Ra, Kothurkar, N. Kb, Kirubha, Ec, and Palanisamy, P. Kc, “Synthesis, characterization, and nonlinear optical properties of graphene oxide functionalized with tetra-amino porphyrin”, Journal of Nanoparticle Research, vol. 15, 2013.