Determination of the Optical Properties of ppTh Nanostructured Films Obtained by RF Plasma Polymerisation Technique

Year 2019, , 374 - 381, 01.03.2019

Özkan Bayram

https://doi.org/10.21597/jist.461102

Abstract

In
this study, it is aimed to obtain plasma polymerized Thiophene (ppTh) thin
films by Radio Frequency (RF) plasma polymerization technique and to determine
optical, chemical and morphological properties of these films. ppTh thin films
were fabricated at 25, 50, 75 and 100 W RF power, 15 minutes coating duration
and 500 mTorr base pressure. ppTh thin films
were analyzed by Scanning Electron Microscopy (SEM), FTIR and Uv-Vis
spectroscopy.
Functional groups of thin films were determined by
FTIR spectroscopy, and it was investigated how coating parameters affect the
chemical structure of these films. Optical properties such as absorbance, transmittance and optical band gap
were determined by Uv-Vis spectroscopy. The optical band gaps of the ppTh thin films were determined to be 2.97 eV, 3.13 eV,
3.17 eV and 3.68 eV with increasing RF power, respectively. In addition, all
thin films were highly transparent in the visible region (500 nm), and this
transparency tended to increase with increasing RF power. SEM analysis showed
that the thin films had nanosphere structure and the radius of these spheres
was about 90 nm.

Keywords

Thiophene, FTIR, RF, optical properties, organic semiconductors

References

• Alancherry S, Bazaka K, Jacob MV, 2018. RF Plasma Polymerization of Orange Oil and Characterization of the Polymer Thin Films. Journal of Polymers and the Environment, 26(7): 2925-2933.
• Ameen S, Ali V, Zulfequar M, Haq MM, Husain M, 2007. Electrical conductivity and dielectric properties of sulfamic acid doped polyaniline. Current Applied Physics, 7(2): 215-219.
• Bayram O, 2018. Determination of the optical and chemical properties of aniline doped plasma polymerized cineole thin films synthesized at various RF powers. Journal of Materials Science: Materials in Electronics, 29(10): 8564-8570.
• Bayram O, Simsek O, 2018. Investigation of the effect of RF energy on optical, morphological, chemical and antibacterial properties of PolyTerpenol thin films obtained by RF-PECVD technique. Journal of Materials Science: Materials in Electronics, 29(8): 6586-6593.
• Bayram O, Simsek O, 2018. A study on the optical, chemical and dielectric properties of PPCIN thin films derived from essential oil compounds using RF plasma polymerisation technique. Vacuum, 156 (10): 198-204.
• Bazaka K, Jacob MV, Truong VK, Crawford RJ, IvanovaEP, 2011. The effect of polyterpenol thin film surfaces on bacterial viability and adhesion. Polymers, 3(1): 388-404.
• Easton CD, Jacob MV, 2009. Optical characterisation of radio frequency plasma polymerised Lavandula angustifolia essential oil thin films. Thin Solid Films, 517(15): 4402-4407.
• Elangovan E, Ramamurthi K, 2005. A study on low cost-high conducting fluorine and antimony-doped tin oxide thin films. Applied surface science, 249(1-4): 183-196.
• Islam S, Lakshmi G, Zulfequar M, Husain M, Siddiqui AM, 2015. Comparative studies of chemically synthesized and RF plasma-polymerized poly (o-toluidine). Pramana, 84(4): 653-665.
• Kausar A, 2016. Synthesis and electrical property of polythiophene/sol-gel silver nanoparticle-based polyethylene composite. International Journal of Composite Materials, 6(2): 43-47.
• Lakshmi G, Dhillon A, Siddiqui AM, Zulfequar M, AvasthiD, 2009. RF-plasma polymerization and characterization of polyaniline. European Polymer Journal, 45(10): 2873-2877.
• MacDiarmid A, 1997. Polyaniline and polypyrrole: where are we headed?. Synthetic Metals, 84(1-3): 27-34.
• Macdiarmid AG, Chiang JC, Halpern M, Huang WS, Mu SL, Nanaxakkara L, Wu SW, Yaniger SI, 1985. Polyaniline: interconversion of metallic and insulating forms. Molecular Crystals and Liquid Crystals, 121(1-4): 173-180.
• Macgregor-Ramiasa MN, Cavallaro AA, Vasilev K, 2015. Properties and reactivity of polyoxazoline plasma polymer films. Journal of Materials Chemistry B, 3(30), 6327-6337.
• Ong BS, Wu Y, Liu P, Gardner S, 2005. Structurally ordered polythiophene nanoparticles for high‐performance organic thin‐film transistors. Advanced Materials, 17(9): 1141-1144.
• Tauc J, Grigorovici R, Vancu A, 1966. Optical properties and electronic structure of amorphous germanium. Physica status solidi (b), 15(2): 627-637.