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

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Jawad Sarfraz , Petri Ihalainen , Anni Määttänen , Roger Bollström , Tina Gulin-Sarfraz , Jouko Peltonen , Mika Lindén
Publication year: 2014
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume number: 460
Start page: 401
End page: 407
ISSN: 0927-7757


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.


coated paper, Functional ink, hydrogen sulfide, printing

Last updated on 2020-08-08 at 07:46

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