Fabrication of novel thin film capacitor based on PVA/ZnO nanocomposites as dielectric material
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Bull Mater Sci (2020)43:299 https://doi.org/10.1007/s12034-020-02273-6
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Fabrication of novel thin film capacitor based on PVA/ZnO nanocomposites as dielectric material T S NIVIN1 and S SINDHU2,* 1
Department of Physics, Amrita School of Arts and Sciences, Amrita Vishwa Vidyapeetham, Amritapuri 690546, India Department of Physics, Birla Institute of Technology and Science, Pilani 333013, India *Author for correspondence ([email protected]) 2
MS received 1 June 2020; accepted 27 July 2020 Abstract. A three-layer thin film capacitor was designed and fabricated with PVA/ZnO nanocomposite as dielectric material. Addition of ZnO nanoparticles showed change in dielectric constant, which varied with frequency and weight percentage. ZnO nanoparticles of weight percentage of 0.5% is chosen for the synthesis of nanoparticles with a grain size of 54 nm, using cost-effective and simple co-precipitation method. It is a low-cost method for large-scale production without impurities. The agglomeration was reduced by adding the starch molecules so that the O–H functional groups could hold together to the nanoparticles at the earlier nucleation stage and can be removed when purification by centrifugation is done. Fourier-transform infrared spectroscopy analysis showed peaks due to the O–H groups in the polymer backbone, CH2 asymmetric and symmetric stretching, C–C stretching and Zn–O stretching, respectively, indicating formation of the proper film. From the profilometer, the thickness was calculated as 195.73 nm for the dielectric film. The fabricated device showed capacitance of 210 nF m-2 in par with the theoretical value (254.451 nF m-2) at 298 K. Keywords.
1.
Thin film capacitor; ZnO nanoparticles; polyvinyl alcohol.
Introduction
Nowadays, the polymer-based nanocomposites are gaining more attention in research field due to the enhancement of properties of both the polymer and the composite. The properties change drastically and help in several applications. This enables different groups to focus on the dispersion of various metal oxides on the polymer matrix. They found that the changes in the physical properties are depending on dispersion homogeneity, metal oxide concentration, particle size and composition [1–12]. Polyvinyl alcohol (PVA) is highly dielectric with good charge storage capacity, flexible and good tensile strength [13,14]. The physical properties of PVA depends on the type of doping filler material. So it is highly applicable in the biomedical field [15]. ZnO is a widely used semiconductor with a bandgap of 3.3 eV at room temperature. The high breakdown voltages, large electric field and high temperature make it ideal for power operations. Due to nonstoichiometry, ZnO has n-type character. The main barrier of ZnO for its use is difficulty of p-type doping. P-type doping in ZnO nanostructures will improve their use in nanoscale electronics and optoelectronics [16]. Many research groups have extensively studied the properties of doped PV
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