Polydiacetylene Capacitive Artificial Nose

V. Kesava Rao, Nagappa L. Teradal, Raz Jelinek

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Polydiacetylenes are a class of conjugated polymers exhibiting unique color and fluorescence properties and employed as useful sensing vehicles. Here we demonstrate for the first time that the dielectric properties of polydiacetylenes can be exploited for vapor sensing. Specifically, electrodes coated with polydiacetylenes, embedded within a porous polyvinylpyrrolidone (PVP) matrix, exhibit significant capacitance transformations upon exposure to different vapors. The capacitive response of the polydiacetylene/PVP films depended upon both the structures of the diacetylene monomer and the extent of ultraviolet irradiation (i.e., polymerization), underscoring a unique sensing mechanism affected by conjugation, structure, and dielectric properties of the polydiacetylene/polymer matrix. Importantly, the variability of polydiacetylene structures allows vapor identification through an array-based pattern recognition (i.e., artificial nose). This study opens new avenues for applications of polydiacetylene systems, particularly pointing to their dielectric properties as powerful sensing determinants.

Original languageEnglish
Pages (from-to)4470-4479
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number4
DOIs
StatePublished - 30 Jan 2019

Keywords

  • artificial nose
  • capacitive vapor sensing
  • dielectric properties
  • polydiacetylene
  • polyvinylpyrrolidone

ASJC Scopus subject areas

  • General Materials Science

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