Stable ink dispersions suitable for roll-to-roll printing with sensitivity towards hydrogen sulphide gas

Jawad Sarfraz, Petri Ihalainen, Anni Määttänen, Roger Bollström, Tina Gulin-Sarfraz, Jouko Peltonen, Mika Lindén

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    This work describes the development of a stable dispersion which is suitable for roll-to-roll printing of a film exhibiting hydrogen sulfide (H2S) gas sensing functionality. The dispersions are made from copper chloride in combination with either citric acid or citric acid and polyaniline (PANI). Aqueous \{PANI\} dispersions together with copper chloride (CC) have been shown to have \{H2S\} sensing properties, but the dispersion gets unstable with the addition of \{CC\} within a pH range from 5 to 8. In this study, a mixture of \{CC\} and citric acid (CA) was optimized for printability as well as for sensitivity towards \{H2S\} gas. Furthermore the stability of an aqueous \{PANI\} dispersion was studied after the addition of \{CC\} or a CC–CA mixture as a function of pH. The stable dispersions were printed on top of flexographically printed interdigitated silver electrodes and their sensitivity towards 10 ppm \{H2S\} was verified by following the change in resistance. The printed films were characterized by atomic force microscope (AFM), time-of-flight secondary ion mass spectroscopy (ToF-SIMS) and conductometry. The sensors showed almost a three orders of magnitude change in resistance upon exposure to 10 ppm \{H2S\} at ambient conditions.
    Original languageUndefined/Unknown
    Pages (from-to)401–407
    JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


    • printing
    • hydrogen sulfide
    • Functional ink
    • coated paper

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