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Dielectric Properties of Calcium Copper Titanium Oxide Nanoparticles/Polyimide Hybrid Composites

Author: SunJia
Tutor: ChiQingGuo
School: Harbin University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Nanoparticles Amorphous ceramics Polyimide Interfacial polarization
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Type: Master's thesis
Year: 2014
Downloads: 8
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Abstract


With the rapid development of the electronics industry, the miniaturization ofintegrated circuit (IC) is significant development trends. The capacitors with highdielectric permittivity are the premise of IC. Inorganic/polymer composites havesignificant development potential because they can combine advantages from bothphases; that is, the high dielectric permittivity of ceramic materials and the goodmechanical strength and ease of processing of the polymer. In this paper, nanosizedcalcium copper titanium oxide particles (a-CCTO) were prepared by sol-gel method,and a-CCTO is amorphous ceramic. Then crystal copper calcium titanate particles(CCTO) were also prepared. Finally, a-CCTO/PI and CCTO/PI hybrid films wereprepared and the dielectric mechanism was also discussed.In this paper, nanosized a-CCTO prepared by sol-gel method at300°C wasamorphous. The dielectric permittivity of it decreases sharply with increasing thefrequency, and is much lower than the permittivity of CCTO sintered at1050°C inthe whole range. The a-CCTO/PI hybrid films were prepared by in-situ method at thelower doping concentrations, the nanosized particles disperse well and the films keepwell processing properties like pure PI. When the a-CCTO/PI hybrid films is3vol%,the dielectric permittivity is4.4, higher than that of CCTO/PI hybrid films (3.8)when the CCTO concentration is10vol%, and compared with pure PI, theincrement is obvious.The dielectric permittivity of a-CCTO/PI hybrid films is higher than that ofCCTO/PI hybrid films, which shows the dielectric property of a-CCTO/PI hybridfilms is not from a-CCTO particles. The interface activation energy Eawascalculated and show that the interface of a-CCTO/PI hybrid films many activeelectrons or charges, while the interface of CCTO/PI hybrid films is insulated. Thedefects of a-CCTO surfaces can supply effective electrons and the nanoparticles property enhances the defect density, so interfacial polarization is much strong.Therefore, the dielectric permittivity can be enhanced markedly in the lowerconcentrations.

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