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Inkjet printing and intense pulsed light sintering of multiwall carbon nanotubes for sensor applications

: Mitra, D.; Zubkova, T.; Gerlach, C.; Kanoun, O.; Miesel, D.; Lang, H.; Baumann, R.R.

Society for Imaging Science and Technology -IS&T-; Imaging Society of Japan -ISJ-:
Printing for Fabrication 2018 : Materials, Applications and Processes, 34th International Conference on Digital Printing Technologies (NIP), September 23-27, 2018, Dresden, Germany; Technical Program, Abstracts, and USB Proceedings
Springfield/Va.: IS&T, 2018
ISBN: 978-0-89208-334-3 (Abstract Book)
ISBN: 978-0-89208-335-0 (USB Stick)
ISBN: 978-0-89208-336-7 (Hardcopy Book)
5 S.
International Conference on Digital Printing Technologies (NIP) <34, 2018, Dresden>
Fraunhofer ENAS ()

Fully inkjet-printed multiwall carbon nanotube (MWCNT) layers and their feasibility towards the implementation as a low cost and flexible sensing element is reported. The focus is set on the resistive behavior of the carbon nanotubes (CNTs) and the adjustability towards a defined target range. To realize the sensors on a low cost and high flexible polyethylene terephthalate (PET) foil, the intense pulsed light (IPL) sintering is introduced to achieve the required performance for both the CNT dispersion as well as the silver electrodes. The very novel topic of the simultaneous photonic sintering of a two-material layer stack and the involved challenges are demonstrated. The MWCNT dispersion was successfully printed with the inkjet printing technology and functionalized by thermal and IPL sintering methods, achieving a resistance of 100 kΩ in the target area (1 kΩ to 1 MΩ) for the sensor. The dependence of the resistance on parameters like number of CNT overprints, the pattern layout as well as the post-treatment methodology is analyzed in detail. These results can be further employed for the development of CNT-based sensor elements and the change in their resistance caused by environmental conditions. In addition, such single sensors raise the opportunity of a combination to a sensor matrix to demonstrate the integration in applications such as a shoe sole (proof of concept) but primarily for medical applications e.g., in mattresses in hospitals for constant recording of bedfast or comatose patients.