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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
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Interface Engineering of "Clickable" Organic Electrochemical Transistors toward Biosensing Devices.

Gonzalo E Fenoy1,2, Roger Hasler1, Christoph Lorenz3

  • 1AIT Austrian Institute of Technology GmbH, Konrad-Lorenz Strasse 24, 3430 Tulln an der Donau, Austria.

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Summary

This study demonstrates "clickable" organic electrochemical transistors (OECTs) functionalized using click chemistry. Optimized methods enable enhanced aptamer immobilization for sensitive thrombin detection in biosensors.

Keywords:
biosensorsclick chemistryorganic electrochemical transistorspoly-l-lysinethrombin

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Biotechnology

Background:

  • Organic electrochemical transistors (OECTs) offer a platform for biosensing.
  • Click chemistry provides a versatile tool for modifying surfaces and devices.
  • Interface engineering is crucial for optimizing OECT performance and functionality.

Purpose of the Study:

  • To explore click chemistry for interface engineering of "clickable" OECTs.
  • To investigate different channel architectures and functionalization strategies.
  • To develop OECT-based biosensors for thrombin detection.

Main Methods:

  • Fabrication and testing of PEDOT-N3 channel OECTs.
  • Cu(I)-catalyzed click reaction with ethynyl-ferrocene for spatial control.
  • Strain-promoted, catalyst-free cycloaddition using poly-l-lysine (PLL-DBCO).
  • Fiber optic (FO)-SPR validation of immobilization.
  • Immobilization of azido-modified HD22 aptamer for thrombin recognition.

Main Results:

  • PEDOT-N3 films confirmed as viable transistor channels.
  • Spatially controlled functionalization achieved via click chemistry.
  • Successful immobilization of aptamers on OECTs.
  • OECT-based biosensors demonstrated high density of immobilized aptamers.
  • Similar dissociation constants (Kd) and enhanced signal change for thrombin detection.

Conclusions:

  • Click chemistry is effective for interface engineering of OECTs.
  • Optimized functionalization leads to improved biosensor performance.
  • Developed OECTs show promise for sensitive and reliable thrombin detection.