Abstract
Synthesis of plasma polymerized cyclohexane (PPCHex) thin films on to glass substrates has been done using a capacitively coupled parallel plate low-pressure glow discharge technique from cyclohexane at room temperature. From scanning electron microscopy, smooth and homogeneous surface of PPCHex thin films is observed and atomic force microscopic micrographs show the roughness of 0.815 to 0.364 nm which also confirm the smooth, homogenous, pinhole free and uniform surface of the PPCHex thin films. The presence of 73.1 and 74.7 percentage of carbon in PPCHex thin films of thicknesses 220 and 350 nm with a small percentage of oxygen is confirmed by the energy dispersive x-ray analysis. The PPCHex thin film is thermally stable up to about 510 K. The structure of PPCHex thin films is observed to vary with film’s thickness by forming new chemical bonds such as O-H stretching, C=C stretching, C≡C stretching, C-O stretching compared to that of the monomer. Allowed direct band gaps of PPCHex thin films are found between 2.97 and 3.61 eV for different thicknesses and allowed indirect band gaps are found to be 1.83 to 2.31 eV. Therefore, the PPCHex could be used in different type of optoelectronic devices.
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Acknowledgements
The authors would like to thank Dr. M. A. Gafur, Senior Scientific Officer, PP and PDC, BCSIR for help in performing the UV-vis spectroscopy and thermal analyses. The authors are also thankful the Head of the Department of Glass and Ceramic Engineering, BUET for taking the FESEM image of the cross-section of the PPCHex thin films. One of the authors (M.A Momin) is thankful to the authority of BUET for giving financial support to complete this work. He is also thankful to Dr. Mohammad Jellur Rahman and Ms. Mehnaz Sharmin for their helping hands. One of the authors (Khandker S. Hossain) gratefully acknowledges the financial support from International Science Program (ISP), Uppsala University, Sweden.
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Momin, M.A., Hossain, K.S. & Bhuiyan, A.H. Microstructural, compositional, topological and optical properties of plasma polymerized cyclohexane amorphous thin films. J Polym Res 26, 83 (2019). https://doi.org/10.1007/s10965-019-1745-1
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DOI: https://doi.org/10.1007/s10965-019-1745-1