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The Electrical Double Layer01:30

The Electrical Double Layer

210
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...
210

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Development of a 3D Graphene Electrode Dielectrophoretic Device
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Single layer graphene as an electrochemical platform.

Nicole L Ritzert1, Wan Li, Cen Tan

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA. hda1@cornell.edu.

Faraday Discussions
|November 27, 2014
PubMed
Summary
This summary is machine-generated.

Graphene platforms show promise for electrochemistry and sensing. While graphene supports electrogenerated chemiluminescence (ECL), film degradation occurs. Graphene enables electrochromic electrodes and microfluidic pH sensing.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Graphene exhibits significant electrochemical properties, driving interest in its fundamental processes and applications.
  • Previous research focused on graphene's charge transfer, molecular transport, and use in electronic, optical, and mechanical systems.

Purpose of the Study:

  • To demonstrate large-area, single-layer graphene platforms for optical, sensing, and microfluidic applications.
  • To explore graphene's utility in electrogenerated chemiluminescence (ECL), electrochromic electrodes, and microfluidic sensing.

Main Methods:

  • Investigated graphene's electrochemical behavior using poly-[Ru(v-bpy)3](2+) for electrogenerated chemiluminescence (ECL).
  • Fabricated electrochromic electrodes using graphene and poly 3,4-ethylenedioxythiophene (EDOT).
  • Developed a microfluidic device utilizing a graphene-based solution-gated field-effect transistor (FET) for pH sensing.

Main Results:

  • Graphene sustained ECL conditions, but film degradation was observed, indicated by decreased ECL intensity.
  • Facile fabrication of electrochromic electrodes from large-area graphene was achieved.
  • Graphene catalyzed NADH oxidation using a redox mediator.
  • Microfluidic FET devices demonstrated real-time, local pH sensing with a 29 mV shift per pH unit.

Conclusions:

  • Graphene serves as a versatile platform for various electrochemical and sensing applications.
  • Challenges such as film degradation in ECL need further investigation.
  • Graphene-based microfluidic devices offer potential for localized, real-time chemical sensing.