Increased optical nonlinearities of graphene nanohybrids covalently functionalized by axially-coordinated porphyrins |
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| Affiliation: | 1. Molecular Materials Research Center, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;2. China–Australia Joint Research Center for Functional Molecular Materials, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, PR China;3. School of Physical Science and Technology, Soochow University, Suzhou 215006, PR China;4. Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia;1. Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094, China;2. School of Public Administration, Shandong Normal University, Jinan 250014, China;1. National Research University of Electronic Technology, 124498 Zelenograd, Moscow, Russian Federation;2. I.M. Sechenov First Moscow State Medical University, 119991 Moscow, Russian Federation;3. Institute of Physiologically Active Compounds, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;1. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, Kerala, India;2. International and Inter-University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam 686560, Kerala, India;3. Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa;4. Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg, South Africa;5. Ultra-fast and Nonlinear Optical Lab, Light and Matter Physics Group, Raman Research Institute, Bangalore 560080, India;6. School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India |
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| Abstract: | Two graphene oxide (GO)-based nanohybrid materials possessing covalent linkages to axially-coordinated tetraphenylporphyrin (TPP), GO–TPP, were prepared and were characterized by Fourier transform infrared (FT-IR), Ultraviolet–visible (UV–Vis) absorption, steady state fluorescence, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), thermogravimetric analysis (TGA), elemental analysis and Raman spectroscopic techniques. The nonlinear optical properties and optical limiting performance of GO, GO–TPP nanohybrids and the free porphyrins dihydroxotin(IV) tetraphenylporphyrin (SnTPP) and the phosphorus-cored porphyrin (PTPP) were investigated using nanosecond and picosecond Z-scan measurements at 532 nm. At the identical mass concentration of 0.2 mg mL−1, GO–TPP nanohybrids exhibited enhanced nonlinear optical properties and optical limiting performance, ascribed to a combination of nonlinear scattering and/or two-photon absorption with reverse saturable absorption, and the photo-induced electron or energy transfer from the electron-donor porphyrin moiety to the acceptor graphene. |
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