Optical properties of single-walled carbon nanotubes functionalized with copolymer poly(3,4-ethylenedioxythiophene-co-pyrene) |
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| Affiliation: | 1. National Institute of Materials Physics, Lab. Optical Processes in Nanostructured Materials, P.O. Box MG-7, Bucharest, R077125, Romania;2. Faculty of Physics, University of Bucharest, 405 bis Atomistilor, P.O. Box MG-1, 077125, Bucharest, Romania;3. Institut des Matériaux “Jean Rouxel” (UMR CNRS-Université de Nantes n°6502), 2 rue de la Houssinière, B.P. 32229, F-44322, Nantes, France;1. Department of Physics, R.M.K Engineering College, Kavaraipettai, Chennai, 601206, India;2. Department of Physics, St.Xavier''s College, Palayamkottai, 627002, India;1. Centro de Investigación en Materiales Avanzados S. C., Miguel de Cervantes 120, Chihuahua 31136, Chihuahua, Mexico;2. Cátedra CONACYT Assigned to Department of Physics of Materials, Centro de Investigación en Materiales Avanzados S. C., Miguel de Cervantes 120, Chihuahua 31136, Chihuahua, Mexico;3. Instituto de Física y Matemáticas, Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca, Mexico;1. School of Physics and Electronics, Henan University, Kaifeng 475004, China;2. Institute for Computational Materials Science, Henan University, Kaifeng 475004, China;1. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, People''s Republic of China;2. Center of Analysis Test, Jiangxi Normal University, Nanchang, Jiangxi 330022, People''s Republic of China;1. Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas – NCEx, Campus Arapiraca, Universidade Federal de Alagoas, 57309-005, Arapiraca, AL, Brazil;2. Grupo Física de Materiais, Instituto de Física, Universidade Federal de Goiás, 74001-970, Goiânia, GO, Brazil;3. Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil |
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| Abstract: | Optical properties are reported for composites based on single-walled carbon nanotubes (SWNTs) and copolymer poly(3,4-ethylenedioxythiophene-co-pyrene) (PEDOT-Py) prepared by chemical polymerization of two monomers in the presence of carbon nanotubes. A charge transfer between SWNTs and the PEDOT-Py copolymer was demonstrated by Raman scattering. The increase in the relative intensity of the Raman lines peaked at 440–577 cm−1, which were assigned to the ethylenedioxy ring vibrational modes, indicated a significant hindrance steric in the case of the composites based on the PEDOT-Py copolymer and metallic SWNTs. The increase in the absorbance of IR band peaked at 984 cm−1 occurred simultaneously with the disappearance of the IR band at 1639 cm−1. This finding was a consequence of the formation of new covalent bonds between SWNTs and the thiophene and benzene rings of the repeating units of the PEDOT-Py copolymer. The photoluminescence (PL) quenching process of the PEDOT-Py copolymer was induced by semiconducting SWNTs. The PL quenching of PEDOT-Py copolymer in the presence of SWNTs was demonstrated based on the energy level diagrams of the two constituents of the PEDOT-Py/SWNTs composite material. |
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| Keywords: | Raman scattering FTIR spectroscopy Photoluminescence Carbon nanotubes Composites |
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