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Sol-gel derived potentiometric pH sensors.

Stephanie M Marxer1, Mark H Schoenfisch

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.

Analytical Chemistry
|February 1, 2005
PubMed
Summary

A novel sol-gel derived pH sensor using amine groups offers rapid and selective detection. Its improved blood compatibility makes it promising for biomedical applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Potentiometric sensors are crucial for measuring pH.
  • Developing biocompatible sensor coatings is essential for in vivo applications.
  • Sol-gel derived xerogels offer tunable material properties.

Purpose of the Study:

  • To develop a novel potentiometric pH sensor using sol-gel derived xerogel films.
  • To evaluate the performance and biocompatibility of the developed sensor.
  • To optimize the xerogel composition for enhanced pH sensing.

Main Methods:

  • Fabrication of a Ag/AgCl electrode coated with a hybrid aminosilane/alkylsilane xerogel film.
  • Evaluation of potentiometric response to pH using various silane combinations.
  • Assessment of response time, Nernstian behavior, and selectivity coefficients.
  • In vitro platelet adhesion tests to evaluate blood compatibility.

Main Results:

  • The optimal sensor used (aminoethylaminomethyl)phenethyltrimethoxysilane and methyltrimethoxysilane.
  • The sensor exhibited near-Nernstian response (-55 mV/decade) and rapid response time (<3 s).
  • High selectivity was observed for H+ over Na+ (log K(pot) = -13) and K+ (log K(pot) = -11).
  • Xerogel coatings demonstrated superior blood compatibility compared to PVC and PU.

Conclusions:

  • A highly responsive and selective potentiometric pH sensor based on sol-gel xerogels was successfully developed.
  • The optimized xerogel composition provides excellent pH sensing capabilities.
  • The enhanced blood compatibility of the xerogel coatings suggests potential for biomedical device integration.

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