Tuning the Magnitude and the Polarity of the Piezoresistive Response of Polyaniline through Structural Control

Melda Sezen-Edmonds, Petr P. Khlyabich, Yueh Lin Loo

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We demonstrate the tunability of both the polarity and the magnitude of the piezoresistive response of polyaniline that is template-synthesized on poly(2-acrylamido-2-methyl-1-propanesulfonic acid), PANI-PAAMPSA, by altering the template molecular weight. Piezoresistivity is quantified by gauge factor, a unitless parameter that relates changes in electrical resistance to applied strain. The gauge factor of PANI-PAAMPSA decreases linearly and becomes negative with decreasing PAAMPSA molecular weight. The polarity of PANI-PAAMPSA's gauge factor is determined by macroscopic connectivity across thin films. PANI-PAAMPSA thin films comprise electrostatically stabilized particles whose size is determined at the onset of synthesis. An increase in the interparticle spacing with applied strain results in a positive gauge factor. The presence of PANI crystallites increases connectivity between particles; these samples instead exhibit a negative gauge factor whereby the resistance decreases with increasing strain. The tunability of the piezoresistive response of these conducting polymers allows their utilization in a broad range of flexible electronics applications, including thermo- and chemoresistive sensors and strain gauges.

Original languageEnglish (US)
Pages (from-to)12766-12772
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number14
DOIs
StatePublished - Apr 12 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • conducting polymers
  • flexible electronics
  • gauge factor
  • piezoresistivity
  • polyaniline
  • resistive sensors
  • strain gauge

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