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A Reactive Inkjet Printing Process for Fabricating Biodegradable Conductive Zinc Structures

Journal Article · · Advanced Engineering Materials
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  1. Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Drive, 427 UCB Boulder CO 80303 USA
  2. Department of Electrical, Computer, and Systems Engineering Case Western Reserve University 10900 Euclid Avenue Cleveland OH 44106 USA

A novel reactive inkjet printing (RIJ) process for fabricating environmentally benign, conductive zinc structures on biodegradable substrates is reported. A precursor consisting of oxidized zinc microparticles is formulated into a viscous ink for high‐resolution, high‐repeatability screen printing. A single RIJ process is performed to selectively dispense an acid‐based oxide etching agent onto the screen‐printed zinc ink to significantly improve its electrical conductivity, up to 4 × 10 4  S m −1 . The RIJ process enables precise control of the amount of deposited etching agent, allowing control of conductivity and avoiding damage caused by excessive acid exposure. The RIJ process deposits the etching agent selectively on the screen‐printed, water‐soluble zinc patterns, thus preserving the print fidelity by avoiding ink smearing that can occur when using a blanket treatment such as submersion. A printed biodegradable antenna with a minimum feature size of 500 μm for use with a batteryless radio frequency identification (RFID) chip is fabricated as demonstration. Due to the higher ink conductivity and improved pattern fidelity, the antenna fabricated by the RIJ process shows a ≈2.2× increase in reading distance compared with a similar antenna that is screen printed and activated using a drop‐casting process.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; AR0001013
OSTI ID:
1876115
Journal Information:
Advanced Engineering Materials, Journal Name: Advanced Engineering Materials Journal Issue: 1 Vol. 25; ISSN 1438-1656
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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