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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Capacitors01:15

Capacitors

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
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Capacitor in an AC Circuit01:23

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A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the strength of the charging current is maximum when the capacitor plates are uncharged and gradually decreases exponentially until the capacitor is fully charged, the charging process is neither instantaneous nor linear. The property of a capacitor to store a charge on its plates is called its capacitance.
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Series and Parallel Capacitors01:14

Series and Parallel Capacitors

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Capacitors, fundamental components in electronic circuits, can be connected in series and/or parallel configurations. Each configuration has different impacts on the overall behavior of the circuit.
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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Alternating current line-filter based on electrochemical capacitor utilizing template-patterned graphene.

Zhenkun Wu1, Liyi Li2, Ziyin Lin2

  • 11] Department of Materials Science and Engineering, CAPT/HEDPS/LTCS, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Engineering, Peking University, Beijing 100871, China [2] School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA.

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|June 18, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed miniaturized graphene-based AC line-filters on flexible substrates. This scalable, room-temperature process offers a promising alternative to bulky aluminum electrolytic capacitors for portable electronics.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Aluminum electrolytic capacitors (AECs) are essential for AC line-filtering but are too large for modern portable electronics.
  • Miniaturization is critical for the advancement of compact electronic devices.

Purpose of the Study:

  • To develop a scalable and room-temperature fabrication process for miniaturized graphene-based AC line-filters.
  • To evaluate the performance of these novel graphene filters as a replacement for conventional AECs.

Main Methods:

  • Graphene oxide (GO) was reduced using patterned metal interdigits at room temperature.
  • Reduced GO was directly employed as the electrode material for the AC line-filters.
  • The fabricated devices were tested for electrical performance and long-term stability.

Main Results:

  • The graphene-based AC line-filters achieved a phase angle of -75.4° at 120 Hz.
  • The devices exhibited a high specific capacitance of 316 µF/cm² and a RC time constant of 0.35 ms.
  • Exceptional stability was demonstrated, retaining 97.2% of initial capacitance after 10,000 charge/discharge cycles.

Conclusions:

  • The developed graphene-based AC line-filters show superior performance characteristics compared to traditional AECs.
  • This technology presents a viable, miniaturized solution for AC line-filtering in portable electronic applications.
  • The scalable, room-temperature fabrication process facilitates potential commercialization.