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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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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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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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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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Spherical and Cylindrical Capacitor01:26

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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
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Updated: Apr 21, 2026

Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
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Biaxially stretchable, integrated array of high performance microsupercapacitors.

Yein Lim, By Yein Lim1, Jangyeol Yoon

  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University , Seoul 136-701, Republic of Korea.

ACS Nano
|October 28, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed stretchable microsupercapacitors (MSCs) on a special substrate that shields devices from strain. This innovation enables robust, high-performance power for wearable electronics and bioimplants.

Keywords:
all-solid-state microsupercapacitor arraybiaxially stretchablehigh power and energy densityliquid metal interconnectionpatternable ionogel electrolyte

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Energy Storage

Background:

  • Developing flexible and stretchable energy storage devices is crucial for next-generation wearable and implantable electronics.
  • Existing stretchable devices often suffer from performance degradation under mechanical strain.
  • Microsupercapacitors (MSCs) offer high power density but integrating them into stretchable platforms remains challenging.

Purpose of the Study:

  • To fabricate a biaxially stretchable array of high-performance microsupercapacitors (MSCs) on a deformable substrate.
  • To design a novel substrate that effectively suppresses strain on active devices.
  • To demonstrate the potential of these stretchable MSCs for powering electronic devices under mechanical deformation.

Main Methods:

  • Fabrication of a deformable substrate using Ecoflex elastomer with embedded polyethylene terephthalate (PET) films to create strain-suppressed regions.
  • Characterization of strain distribution using finite element method (FEM) analysis.
  • Fabrication of all-solid-state planar MSCs using multiwalled carbon nanotube electrodes and ionogel electrolyte.
  • Integration of MSCs onto the substrate with liquid metal interconnections and Ag nanowire contacts.
  • Testing electrochemical performance and stability under various uniaxial and biaxial strain conditions.

Main Results:

  • The strain-suppressed region effectively isolated MSCs, with maximum strain below 0.02% while the elastomer experienced over 250% strain.
  • The MSC array achieved high energy and power densities of 25 mWh/cm³ and 32 W/cm³, respectively.
  • Stable electrochemical performance was maintained up to 100% uniaxial and 50% biaxial stretching.
  • The MSC array successfully powered micro-light-emitting diode (μ-LED) arrays even under strain.

Conclusions:

  • A novel strain-mitigating substrate design enables the fabrication of highly stretchable MSC arrays.
  • The developed MSCs exhibit excellent electrochemical performance and durability under significant mechanical strain.
  • This technology holds significant promise for self-powered wearable and bioimplantable electronic systems.