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• W1520726180 abstract "Embedded decoupling capacitor problem has been pursued by several groups and industry around the world over the past decade. Currently popular ceramic-polymer composites can only provide limited capacitance, typically within 10 nF/cm. With the reliability and processing constraints imposed, the capacitance density would be much lower. Newer capacitor concepts such as supercapacitors can overcome the limitations of existing polymer based capacitors and are now being considered by some groups. These concepts rely on nanostructured electrodes for high surface area per unit volume resulting in ultrahigh capacitance densities and unconventional polarization mechanisms such as electrical double layer and interfacial polarization. Supercapacitive structures lead to ultrahigh capacitance densities of the order of 100s of microfarads. However, manufacturers report that the properties are unstable at high frequencies, typically even at 10s of MHz. To adapt these structures for mid-to-high-frequency decoupling, it is hence essential to systematically characterize the high frequency dielectric properties of the thin nanocomposite films and nanostructured electrodes. This work reports complete electrical characterization of a part of such system, carbon black-epoxy nanocomposites. The high-frequency properties of the cured films were evaluated with a multiline calibration technique by measuring s-parameters of transmission lines fabricated on the top of the dielectrics. Though the nanostructured carbon black epoxy composites showed high dielectric constant of 1000 at low frequencies, the high frequency (0.5-4.5 GHz) dielectric constant was found to be only up to 10/spl times/ that of the base polymer matrix. The measured dielectric constant at GHz frequencies increased from 15-30 when the filler content was increased from 3.8 % to 6.5 %, with excessive leakage currents. Based on these measurements, conduction and polarization relaxation mechanisms will be assessed and the suitability of the thin film supercapacitors for high-frequency decoupling applications will be discussed." @default.
• W1520726180 created "2016-06-24" @default.
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• W1520726180 date "2005-03-21" @default.
• W1520726180 modified "2023-09-26" @default.
• W1520726180 title "High frequency characteristics of nanocomposite thin film supercapacitors and their suitability for embedded decoupling" @default.
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• W1520726180 doi "https://doi.org/10.1109/eptc.2004.1396595" @default.
• W1520726180 hasPublicationYear "2005" @default.
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