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Open AccessArticle

Tape Transfer Printing of a Liquid Metal Alloy for Stretchable RF Electronics

1
The Angstrom Laboratory, Department of Engineering Sciences, Uppsala University, Box 534, Uppsala 75121, Sweden
2
State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Sensors 2014, 14(9), 16311-16321; https://doi.org/10.3390/s140916311
Received: 31 May 2014 / Revised: 22 August 2014 / Accepted: 27 August 2014 / Published: 3 September 2014
(This article belongs to the Special Issue Printed Sensors)
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 μm. 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. View Full-Text
Keywords: tape transfer printing; liquid metal alloy; microfluidic stretchable electronics; stretchable RF electronics; radio frequency identification (RFID) tag tape transfer printing; liquid metal alloy; microfluidic stretchable electronics; stretchable RF electronics; radio frequency identification (RFID) tag
MDPI and ACS Style

Jeong, S.H.; Hjort, K.; Wu, Z. Tape Transfer Printing of a Liquid Metal Alloy for Stretchable RF Electronics. Sensors 2014, 14, 16311-16321.

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