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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
MOS Capacitor01:25

MOS Capacitor

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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Debye–Huckel–Onsager Conductance Equation01:28

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The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...

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Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material
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Electric double-layer capacitance between an ionic liquid and few-layer graphene.

Eri Uesugi1, Hidenori Goto, Ritsuko Eguchi

  • 1Research Laboratory for Surface Science, Okayama University, Okayama, Japan.

Scientific Reports
|April 4, 2013
PubMed
Summary

Ionic-liquid gates achieve high carrier density by optimizing the electric double layer (EDL) capacitance. Graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ionic-liquid gates enable high carrier densities due to their electric double layer (EDL) and large geometrical capacitance (Cg).
  • Achieving high carrier density in graphene with ionic-liquid gates is limited by the series connection of Cg and quantum capacitance (Cq).

Purpose of the Study:

  • To investigate molecular-level determinants of EDL capacitance (CEDL) in graphene.
  • To optimize Cq by varying the number of graphene layers (n).

Main Methods:

  • Systematic variation of graphene layer number (n).
  • Analysis of the relationship between n, Cq, and CEDL.

Main Results:

  • CEDL is governed by Cq for n < 4 and by Cg for n > 4.
  • This transition reveals the composite nature of CEDL.
  • A universal principle for microscopic capacitance determination is clarified.

Conclusions:

  • Understanding the interplay between Cq and Cg is crucial for optimizing EDL capacitance in graphene.
  • Findings offer insights for nanotechnological applications in charge accumulation and energy storage.
  • The study provides a foundation for designing advanced ultrathin capacitors.