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Related Concept Videos

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For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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Tools for Surface Treatment of Silicon Planar Intracortical Microelectrodes
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Published on: June 8, 2022

Redox-active monolayers on nano-scale silicon electrodes.

Qian Zhao1, Yong Luo, Shyam Surthi

  • 1Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695, USA.

Nanotechnology
|July 6, 2011
PubMed
Summary

Uniform nano-scale capacitors were fabricated using advanced etching techniques and self-assembled monolayers. These novel devices exhibit high capacitance and conductance peaks due to redox-active ferrocenes within the monolayer.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Fabrication of nano-scale capacitors is crucial for advanced electronic devices.
  • Controlling molecular assembly on silicon surfaces presents significant challenges.
  • Redox-active molecules offer unique electronic properties for capacitor applications.

Purpose of the Study:

  • To fabricate uniform arrays of nano-scale electrolyte-molecule-silicon capacitors.
  • To investigate the electrical characteristics of self-assembled monolayers in nano-capacitors.
  • To understand the role of redox-active ferrocenes in device performance.

Main Methods:

  • Fabrication using reactive ion etch and selective wet etch through anodic aluminium oxide masks.
  • Formation of nano-holes in silicon oxide/silicon nitride insulator layers on silicon.
  • Attachment of self-assembled monolayers of 4-ferrocenylbenzyl alcohol to exposed silicon surfaces.

Main Results:

  • Successful fabrication of uniform nano-scale capacitor arrays.
  • Observation of very high capacitance and conductance peaks near -0.6 V.
  • Attribution of peaks to electron charging/discharging in discrete monolayer levels due to ferrocenes.

Conclusions:

  • Demonstrated feasibility of fabricating nano-scale capacitors with molecular monolayers.
  • Highlighted the significant impact of redox-active ferrocenes on capacitance and conductance.
  • Opened avenues for molecular electronics and advanced energy storage devices.