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Sensors 2014, 14(9), 16311-16321; doi:10.3390/s140916311

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.
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)
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Abstract

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
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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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