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Electroanalytical devices with fluidic control using textile materials and methods

Time: Fri 2020-09-11 10.00

Location:, (English)

Subject area: Fibre and Polymer Science Materials Science and Engineering Biotechnology

Doctoral student: Ingrid Öberg Månsson , Fiberteknologi

Opponent: Universitetslektor Gaston A. Crespo, Tillämpad fysikalisk kemi

Supervisor: Docent Mahiar Hamedi, Fiberteknologi; Lars Wågberg, Fiberteknologi, VinnExcellens Centrum BiMaC Innovation, Pappers- och massateknik, Fiber- och polymerteknologi, Linné Flow Center, FLOW, Wallenberg Wood Science Center

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This thesis, written by Ingrid Öberg Månsson at KTH Royal Institute of Technology and entitled “Electroanalytical devices with fluidic control using textile materials and methods”, presents experimental studies on the development of textile based electronic devices and biosensors. One of the reasons why this is of interest is the growing demand for integrated smart products for wearable health monitoring or energy harvesting. To enable such products, new interdisciplinary fields arise combining traditional textile technology and electronics.

Textile based devices have garnered much interest in recent years due to their innate ability to incorporate function directly into, for example, clothing or bandages by textile processes such as weaving, knitting or stitching. However, many modifications of yarns required for such applications are not available on an industrial scale. The major objective of this work has been to study how to achieve the performance necessary to create electronic textile devices by either coating yarns with conductive material or using commercially available conductive yarns that are functionalized to create sensing elements.

Further, liquid transport within textile materials has been studied to be able to control the contact area between electrolyte and electrodes in electrochemical devices such as sensors and transistors. Yarns with specially designed cross-sections, traditionally used in sportswear to wick sweat away from the body and enhance evaporation, was used to transport electrolyte liquids to come in contact with yarn electrodes. The defined area of the junction where the fluidic yarn meets the conductive yarn was shown to increase stability of the measurements and the reproducibility between devices.

The results presented in the two publications of this thesis as well as additional results presented in the thesis itself show the promising potential of using textile materials to integrate electronic and electrochemical functionality in our everyday life. This is shown by using basic textile materials and processing techniques to fabricate complex devices for various application areas such as sensors and diagnostics as well as electrical and energy harvesting components.