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Tape Transfer Printing of a Liquid Metal Alloy for Stretchable RF Electronics
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, Solid State Electronics.
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.
2014 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 14, no 9, 16311-16321 p.Article in journal (Refereed) Published
Abstract [en]

In order to make conductors with large cross sections for low impedance radio frequency (RF) electronics, while still retaining high stretchability, liquid-alloy-based microfluidic stretchable electronics offers stretchable electronic systems the unique opportunity to combine various sensors on our bodies or organs with high-quality wireless communication with the external world (devices/systems), without sacrificing enhanced user comfort. This microfluidic approach, based on printed circuit board technology, allows large area processing of large cross section conductors and robust contacts, which can handle a lot of stretching between the embedded rigid active components and the surrounding system. Although it provides such benefits, further development is needed to realize its potential as a high throughput, cost-effective process technology. In this paper, tape transfer printing is proposed to supply a rapid prototyping batch process at low cost, albeit at a low resolution of 150 mu m. In particular, isolated patterns can be obtained in a simple one-step process. Finally, a stretchable radio frequency identification (RFID) tag is demonstrated. The measured results show the robustness of the hybrid integrated system when the tag is stretched at 50% for 3000 cycles.

Place, publisher, year, edition, pages
2014. Vol. 14, no 9, 16311-16321 p.
Keyword [en]
tape transfer printing, liquid metal alloy, microfluidic stretchable electronics, stretchable RF electronics, radio frequency identification (RFID) tag
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-237588DOI: 10.3390/s140916311ISI: 000343106600041OAI: oai:DiVA.org:uu-237588DiVA: diva2:768936
Available from: 2014-12-05 Created: 2014-12-03 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Soft Intelligence: Liquids Matter in Compliant Microsystems
Open this publication in new window or tab >>Soft Intelligence: Liquids Matter in Compliant Microsystems
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Soft matter, here, liquids and polymers, have adaptability to a surrounding geometry. They intrinsically have advantageous characteristics from a mechanical perspective, such as flowing and wetting on surrounding surfaces, giving compliant, conformal and deformable behavior. From the behavior of soft matter for heterogeneous surfaces, compliant structures can be engineered as embedded liquid microstructures or patterned liquid microsystems for emerging compliant microsystems.

Recently, skin electronics and soft robotics have been initiated as potential applications that can provide soft interfaces and interactions for a human-machine interface. To meet the design parameters, developing soft material engineering aimed at tuning material properties and smart processing techniques proper to them are to be highly encouraged. As promising candidates, Ga-based liquid alloys and silicone-based elastomers have been widely applied to proof-of-concept compliant structures.

In this thesis, the liquid alloy was employed as a soft and stretchable electrical and thermal conductor (resistor), interconnect and filler in an elastomer structure. Printing-based liquid alloy patterning techniques have been developed with a batch-type, parallel processing scheme. As a simple solution, tape transfer masking was combined with a liquid alloy spraying technique, which provides robust processability. Silicone elastomers could be tunable for multi-functional building blocks by liquid or liquid-like soft solid inclusions. The liquid alloy and a polymer additive were introduced to the silicone elastomer by a simple mixing process. Heterogeneous material microstructures in elastomer networks successfully changed mechanical, thermal and surface properties.

To realize a compliant microsystem, these ideas have in practice been useful in designing and fabricating soft and stretchable systems. Many different designs of the microsystems have been fabricated with the developed techniques and materials, and successfully evaluated under dynamic conditions. The compliant microsystems work as basic components to build up a whole system with soft materials and a processing technology for our emerging society.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 93 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1357
Keyword
Liquid, Elastomer, Cross-linking, Liquid alloy, PDMS, Adaptability, Compliance, Interface, Patterning, Printing, Surface energy, Wetting, Composite, Modulus, Stretchability, Viscoelasticity, Thermal conductivity, Contact resistance, Adhesion, Packaging, Integration, Microsystems, Microfluidics, Strain sensor, Thermoelectrics, Inductive coupling, Wireless communication, Stretchable electron-ics, Epidermal electronics, Skin electronics, Soft robotics, Wearable electronics
National Category
Composite Science and Engineering Textile, Rubber and Polymeric Materials Energy Engineering Other Engineering and Technologies not elsewhere specified Embedded Systems Robotics
Research subject
Engineering Science with specialization in Microsystems Technology; Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-281281 (URN)978-91-554-9521-3 (ISBN)
Public defence
2016-05-11, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2016-04-19 Created: 2016-03-21 Last updated: 2016-04-21

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