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Morphology and conductivity of Au electrodes on polydimethylsiloxane using (3-mercaptopropyl)trimethoxysilane (MPTMS) as an adhesion promoter

Osmani, Bekim and Deyhle, Hans and Weiss, Florian M. and Töpper, Tino and Karapetkova, Maria and Leung, Vanessa and Müller, Bert. (2016) Morphology and conductivity of Au electrodes on polydimethylsiloxane using (3-mercaptopropyl)trimethoxysilane (MPTMS) as an adhesion promoter. Proceedings of SPIE, 9798. p. 979822.

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Official URL: http://edoc.unibas.ch/42689/

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Abstract

Dielectric elastomer actuators (DEA) are often referred to as artificial muscles due to their high specific continuous power, which is comparable to that of human skeletal muscles, and because of their millisecond response time. We intend to use nanometer-thin DEA as medical implant actuators and sensors to be operated at voltages as low as a few tens of volts. The conductivity of the electrode and the impact of its stiffness on the stacked structure are key to the design and operation of future devices. The stiffness of sputtered Au electrodes on polydimethylsiloxane (PDMS) was characterized using AFM nanoindentation techniques. 2500 nanoindentations were performed on 10 x 10 μm2 regions at loads of 100 to 400 nN using a spherical tip with a radius of (522 ± 2) nm. Stiffness maps based on the Hertz model were calculated using the Nanosurf Flex-ANA system. The low adhesion of Au to PDMS has been reported in the literature and leads to the formation of Au-nanoclusters. The size of the nanoclusters was (25 ± 10) nm and can be explained by the low surface energy of PDMS leading to a Volmer-Weber growth mode. Therefore, we propose (3-mercaptopropyl)trimethoxysilane (MPTMS) as a molecular adhesive to promote the adhesion between the PDMS and Au electrode. A beneficial side effect of these self-assembling monolayers is the significant improvement of the electrode’s conductivity as determined by four-point probe measurements. Therefore, the application of a soft adhesive layer for building a dielectric elastomer actuator appears promising.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedical Engineering > Biomaterials Science Center
03 Faculty of Medicine > Departement Biomedical Engineering > Biomaterials Science Center > Materialwissenschaft (Müller)
UniBasel Contributors:Osmani, Bekim and Deyhle, Hans and Weiss, Florian and Töpper, Tino and Leung, Vanessa and Müller, Bert
Item Type:Article, refereed
Publisher:SPIE
ISSN:1996-756X
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:24 Nov 2016 10:23
Deposited On:24 Nov 2016 10:23

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