Abstract
An electrochemical amperometric ethylene sensor with solid polymer electrolyte (SPE) and semi-planar three electrode topology involving a working, pseudoreference, and counter electrode is presented. The polymer electrolyte is based on the ionic liquid 1-butyl 3-methylimidazolium bis(trifluoromethylsulfonyl)imide [BMIM][NTf2] immobilized in a poly(vinylidene fluoride) matrix. An innovative aerosol-jet printing technique was used to deposit the gold working electrode (WE) on the solid polymer electrolyte layer to make a unique electrochemical active SPE/WE interface. The analyte, gaseous ethylene, was detected by oxidation at 800 mV vs. the platinum pseudoreference electrode. The sensor parameters such as sensitivity, response/recovery time, repeatability, hysteresis, and limits of detection and quantification were determined and their relation to the morphology and microstructure of the SPE/WE interface examined. The use of additive printing techniques for sensor preparation demonstrates the potential of polymer electrolytes with respect to the mass production of printed electrochemical gas sensors.
Highlights
The sensor was exposed to several test cycles in order to determine basic sensor parameters such as sensitivity, response/recovery time, repeatability, hysteresis, limit of detection (LOD), and limit of quantification (LOQ)
An electrochemical amperometric ethylene sensor with a new form of semi-planar electrode topology is presented. This design brings several advantages, such as the absence of liquid electrolyte, the better sensitivity of solid polymer electrolyte (SPE) based ethylene sensors, and the opportunity to study the microstructure of the gold working electrode and the SPE/WE interface in more detail
While the microstructure of the polymer electrolyte had a substantial impact on sensor sensitivity, the morphology of the gold working electrode strongly influenced the response/recovery time
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Ethylene (C2 H4 ) is a natural plant substance that controls the ripening process in many fruits and vegetables [1]. As a commodity group of perishable foods, are the subject of interest of the Food and Agriculture Organization of the United. Nations (FAO), which focuses on food security and the reduction of food loss and waste
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