Sensitive and Selective NO2 Sensing Based on Alkyl- and Alkylthio-Thiophene Polymer Conductance and Conductance Ratio Changes from Differential Chemical Doping

Hui Li, Jennifer Dailey, Tejaswini Kale, Kalpana Besar, Kirsten A Koehler, Howard E. Katz

Research output: Contribution to journalArticle

Abstract

NO2-responsive polymer-based organic field-effect transistors (OFETs) are described, and roomerature detection with high sensitivity entirely from the semiconductor was achieved. Two thiophene polymers, poly(bisdodecylquaterthiophene) and poly(bisdodecylthioquaterthiophene) (PQT12 and PQTS12, respectively), were used as active layers to detect a concentration at least as low as 1 ppm of NO2. The proportional on-current change of OFETs using these polymers reached over 400% for PQTS12, which is among the highest sensitivities reported for a NO2-responsive device based on an organic semiconducting film. From measurements of cyclic voltammetry and the electronic characteristics, we found that the introduction of sulfurs into the side chains induces traps in films of the PQTS12 and also decreases domain sizes, both of which could contribute to the higher sensitivity of PQTS12 to NO2 gas compared with PQT12. The ratio of responses of PQTS12 and PQT12 is higher for exposures to lower concentrations, making this parameter a means of distinguishing responses to low concentrations for extended times from exposures to high concentrations from shorter times. The responses to nonoxidizing vapors were much lower, indicating good selectivity to NO2 of two polymers. This work demonstrates the capability of increasing selectivity and calibration of OFET sensors by modulating redox and aggregation properties of polymer semiconductors.

Original languageEnglish (US)
Pages (from-to)20501-20507
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number24
DOIs
StatePublished - Jun 21 2017

Keywords

  • field effect transistor
  • high sensitivity
  • NO sensing
  • ratiometric sensing
  • thiophene polymers

ASJC Scopus subject areas

  • Materials Science(all)

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