P3HT and PEDOT:PSS printed thin films on chemiresistors: An economic and versatile tool for ammonia and humidity monitoring applications

Katharina Kumpf, Stephan Trattner, Patrik Aspermair, Johannes Bintinger, Philipp Fruhmann

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We hereby present the fabrication of simple and efficient humidity and ammonia sensors based on a chemiresistor design employing a differential measurement technique. Interdigitated electrodes are connected via PEDOT:PSS or P3HT polymers and a reproducible and scalable fabrication procedure is presented. This procedure utilizes pneumatic nozzle printing instead of drop or spin-based processes and includes an optimized encapsulation procedure and material for sealing the reference electrodes. The suitability of the NH3 sensor for quantifying ammonia in a range of 2 to 100 ppm within a period of several months is furthermore presented. The developed humidity sensor is operational for several months in a humidity range between 10 and 60% RH. Once this range is exceeded, a sensor decay by irreversible saturation can be observed. Based on the low fabrication costs of the sensors (~0.5 $ when ordering 1000 pcs of the platform + printing work), they provide a very attractive tool for industrial humidity and ammonia sensing applications.
    Original languageEnglish
    Article numbere53733
    Number of pages13
    JournalJournal of Applied Polymer Science
    Volume140
    Issue number15
    DOIs
    Publication statusPublished - 8 Feb 2023

    Research Field

    • Biosensor Technologies

    Keywords

    • ammonia
    • chemiresistor
    • gas sensing
    • humidity
    • pneumatic nozzle printing

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