Conducting polyaniline-rutile TiO2 nanocomposites for the development of high-k dielectric materials |
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| Authors: | M R Karim M T I Bhuiyan M B Zaman C J Lee M S Lee |
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| Institution: | 1. Center of Excellence for Research in Engineering Materials, Advanced Manufacturing Institute, King Saud University, Riyadh, Kingdom of Saudi Arabiamkarim@ksu.edu.sa;3. Department of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario, Canada;4. Center of Excellence for Research in Engineering Materials, Advanced Manufacturing Institute, King Saud University, Riyadh, Kingdom of Saudi Arabia;5. Medical Sciences Division, Northern Ontario School of Medicine, Sudbury, Canada;6. School of Chemical Industry, Yeungnam College of Science and Technology, Nam-gu, Daegu, Republic of Korea;7. Department of Chemistry, Kyungpook National University, Daegu, Republic of Korea |
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| Abstract: | Inorganic dielectrics encapsulated in an organic matrix are showing excellent promise as novel dielectric materials. In this work, firstly highly organized crystalline nanoparticles of rutile TiO2 were synthesized by acid hydrolysis of titanium isopropoxide at room temperature. Then we developed a novel dielectric material consisting of highly organized rutile TiO2/polyaniline (PAni) nanocomposites by in-situ chemical oxidative polymerization. The structural, morphological, conducting, and dielectric properties of the rutile TiO2/PAni nanoparticles have been evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution-transmission emission microscopy (HR-TEM), four-point probe technique, CV (Capacitance versus Voltage), and Impedance analyzer. The nanocomposites show 70 times higher permittivity compared to rutile nanoparticles and much higher compared to anatase/PAni (ES) nanocomposites at 10 MHz. Large interfacial polarizations, nanostructure, and dopant levels are the key factors for the large dielectric constant of the nanocomposites. The rutile/PAni (ES) nanocomposites might see potential uses in super-capacitors, gate dielectric in transistors, and capacitive-type gas sensors. |
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| Keywords: | Dielectric materials nanocomposites polyaniline rutile TiO2 |
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