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pH Sensitivity of Novel PANI/PVB/PS3 Composite Films.

Edric Gill1, Arousian Arshak2, Khalil Arshak3

  • 1Dept. of Physics, University of Limerick, Limerick, Ireland.

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|September 15, 2017
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Summary

Novel composite films show promising pH sensitivity using conductimetric sensing. Screen-printed films offer a stable, three-order-of-magnitude conductance change across a wide pH range, confirming deprotonation as the sensing mechanism.

Keywords:
PANI composite filmXPSconductanceinterdigitated electrodes.thick films

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Sensing

Background:

  • Conductimetric sensing offers a promising alternative to conventional pH measurement methods.
  • Polyaniline (PANI)/polyvinyl butyral (PVB)/polystyrene sulfonate (PS3) composite films were investigated for pH sensitivity.
  • Screen-printing and drop-coating are deposition methods explored for film fabrication.

Purpose of the Study:

  • To evaluate the pH sensitivity of novel PANI/PVB/PS3 composite films.
  • To determine the optimal film deposition method for conductimetric pH sensing.
  • To elucidate the sensing mechanism responsible for the observed pH response.

Main Methods:

  • Fabrication of PANI/PVB/PS3 composite films using screen-printing and drop-coating.
  • Conductimetric measurements to assess film response to varying pH levels.
  • X-ray Photoelectron Spectroscopy (XPS) to analyze chemical changes in the film.
  • Scanning Electron Microscopy (SEM) and Profilometry to evaluate film morphology.

Main Results:

  • Screen-printed thick films exhibited the highest pH sensitivity, with conductance changing by three orders of magnitude over pH 2-11.
  • The devices demonstrated stable performance over 96 hours of continuous operation.
  • XPS analysis confirmed that changes in conductance were due to the deprotonation of the PANI polymer backbone.
  • SEM and Profilometry indicated no significant changes in film morphology or dimensions upon exposure to buffer solutions.

Conclusions:

  • PANI/PVB/PS3 composite films, particularly those prepared by screen-printing, are effective conductimetric pH sensors.
  • The sensing mechanism relies on the deprotonation of the PANI backbone, leading to significant changes in film conductance.
  • These films offer a stable and sensitive platform for pH monitoring with minimal structural alteration.