Changes in the optical properties of as-deposited plasma polymerized 2,6-diethylaniline thin films by iodine doping |
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| Institution: | 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. The Key Laboratory of Inorganic Functional Materials and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. SPACS, George Mason University, Fairfax, VA, USA;2. Naval Research Laboratory, Washington, DC, USA;1. CNR-IMEM, Parco Area delle Scienze, 37A, Parma, Italy;2. Department of Physics and Earth Sciences, University of Parma, Viale Usberti 7A, Italy;1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;2. Department of Physics and Engineering Physics, University of Saskatchewan, Saskatchewan, Canada, S7N 5E2;3. Department of Physics, Nanyang Normal University, Nanyang 473061, China;1. Physics Department, New York City College of Technology, The City University of New York, NY 11201, USA;2. The Graduate School and University Center, The City University of New York, New York, NY 10016, USA;1. Instituto de Ciencias Básicas, UNCuyo 5500 - Mendoza, Argentina;2. CONICET - Instituto Balseiro, Centro Atómico Bariloche, Argentina;3. IANIGLA - CONICET, CCT Mendoza, 5500 - Mendoza, Argentina |
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| Abstract: | In this study, plasma polymerized 2, 6-diethylaniline (PPDEA) thin films of different thicknesses were synthesized using a glow discharge plasma polymerization method. Scanning electron microscopy showed that the surface morphology of an as-deposited PPDEA thin film was comparatively smooth after iodine doping. The iodine-doped PPDEA was found to be thermally stable up to ca about 560 K, which was slightly lower than that observed for as-deposited PPDEA. Ultraviolet-visible spectroscopic analyses demonstrated that iodine doping resulted in a significant decrease in the optical energy gap. As the doping period increased, the direct optical transition energy gap was reduced from 3.56 to 2.79 eV and the indirect optical transition energy gap was decreased from 2.23 to 1.97 eV. Thus it is observed that, the optical parameters of as-deposited PPDEA thin films with different thicknesses can be modified with different iodine doping periods. |
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| Keywords: | A Thin films B Plasma deposition C Electron microscopy D Optical properties |
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