Carbon dioxide detection with polyethylenimine blended with polyelectrolytes

T.C.D. Doan, J. Baggerman, R. Ramaneti, H.D. Tong, A.T.M. Marcelis, C.J.M. van Rijn

Research output: Contribution to journalArticleAcademicpeer-review

20 Citations (Scopus)

Abstract

Branched polyethylenimine (PEI) is studied for use as a chemiresistor for detection of carbon dioxide(CO2) at room temperature. The DC and AC measurements of drop-coated PEI films on interdigitated electrodes revealed a noticeable decrease in conductivity upon exposure to CO2 (400–2000 ppm) underhigh humidity (>60% RH) at room temperature. The increased resistance/impedance is attributed to the formation of carbamates and bicarbonates at amine sites of the PEI chain in the presence of CO2 and water. The response with increasing CO2 concentration followed a Langmuir isotherm, indicating that the response can be attributed to an adsorption process. The conductivity is also found to be larger at higher humidity. Blending of PEI with the polyelectrolytes yielded a higher sensitivity for the blend with Nafion sodium salt and shorter recovery times for both blends with Nafion sodium salt and poly(sodium4-styrenesulfonate) in comparison with PEI. The improved sensitivity of the PEI blend opens possibilities of using these blends in CO2 sensors for greenhouses and offices.
Original languageEnglish
Pages (from-to)452-459
Number of pages8
JournalSensors and Actuators B: Chemical
Volume201
DOIs
Publication statusPublished - 2014

Keywords

  • conducting polymer interaction
  • sulfonated polyaniline
  • gaseous substances
  • room-temperature
  • chemical sensors
  • sensing layers
  • co2 capture
  • gas sensors
  • water
  • hydrogen

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