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Silicone-based Carbon Black Composite for Epidermal Electrodes
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A method of synthesizing silicone-based composite consisting of carbon black

(CB) as a conductive ller in Polydimethylsiloxane (PDMS) was developed.

The aim was to nd a cost eective and easier method to fabricate stretchable,

epidermal and conductive electrodes in striving for inexpensive real-time health

monitoring. In this work, instead of expensive additive materials for enhancement

of PDMS conductivity, CB powder, at lower cost was used. To optimize

the electrophysiological properties of the electrodes, limited amount of silver

(Ag) and silver chloride (AgCl) particles were added. The electrical characteristic

of the electrodes and their stretchability was studied.

Since fabrication and characterization did not require clean room enviroment,

the developed method was less costly and less time consuming. Samples were

made of six dierent ller concentrations in three sets, which in total were 18

samples, in order to obtain better statistics. Resistance of all samples was measured

and resistivity values were calculated. Tensile test were performed on all

samples. The result showed that all samples had elongation of over 50 %, which

is feasible for stretchable, epidermal patches. Samples with ller concentration

of 10 wt% CB + 5 wt% Ag/AgCl and 10 wt% CB + 8 wt% Ag/AgCl showed

resistivity of Wcm range. The electrodes were conductive, soft, stretchable and

biocompatible. They fulll the requirements of epidermal patches for health

monitoring.

Place, publisher, year, edition, pages
2019. , p. 44
Series
TVE ; 19002
Keywords [en]
cPDMS, cAgPDMS, epidermal electrodes, silicon based composite, carbon black poltdimethylsiloxane
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-401868OAI: oai:DiVA.org:uu-401868DiVA, id: diva2:1384429
Presentation
2019-12-12, 09:15 (English)
Supervisors
Examiners
Available from: 2020-01-22 Created: 2020-01-09 Last updated: 2020-01-22Bibliographically approved

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