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Morphological, elemental, and optical characterization of plasma polymerized n-butyl methacrylate thin films

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Abstract

Plasma polymerized n-butyl methacrylate (PPnBMA) thin films of varying thicknesses were prepared at room temperature by AC plasma polymerization system using a capacitively coupled parallel plate reactor. Field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), energy-dispersive X-ray (EDX) analysis, and ultraviolet–visible (UV–Vis) spectroscopic investigation have been performed to study the morphological, elemental, and optical properties of the PPnBMA thin films, respectively. The flat and defect-free nature of thin films were confirmed by FESEM and AFM images. With declining plasma power, average roughness and root mean square roughness increase. Allowed direct transition (Egd) and indirect transition (Egi) energy gaps were found to be 3.64–3.80 and 3.38–3.45 eV, respectively, for PPnBMA thin films of different thicknesses. Values of Egd as well as Egi increase with the increase of thickness. The extinction coefficient, Urbach energy, and steepness parameter were also determined for these thin films.

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Acknowledgements

The financial support of this research, given by the Bangladesh University of Engineering and Technology (BUET), Dhaka 1000, is greatly acknowledged. The authors would like to acknowledge the help of BCSIR for providing the laboratory facilities to record the UV–Vis spectroscopy. One of the authors (Rahima Nasrin) is grateful to the authority of University of Barisal, Bangladesh for generous support to continue her research work. One of the authors (Khandker S. Hossain) acknowledges the support of International Science Program (ISP), Uppsala University, Sweden.

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Authors and Affiliations

  1. Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh

    Rahima Nasrin & A. H. Bhuiyan

  2. Department of Physics, University of Barisal, Barisal, 8200, Bangladesh

    Rahima Nasrin

  3. Department of Physics, University of Dhaka, Dhaka, 1000, Bangladesh

    Khandker S. Hossain

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  1. Rahima Nasrin
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  2. Khandker S. Hossain
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  3. A. H. Bhuiyan
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Correspondence to Rahima Nasrin.

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Nasrin, R., Hossain, K.S. & Bhuiyan, A.H. Morphological, elemental, and optical characterization of plasma polymerized n-butyl methacrylate thin films. Appl. Phys. A 124, 391 (2018). https://doi.org/10.1007/s00339-018-1795-y

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