Journal
ADVANCED MATERIALS
Volume 29, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201702665
Keywords
bioresorbable electronics; conductive inks; electrochemical sintering; printed electronics; transient electronics
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Funding
- Kwanjeong Educational Foundation
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This study describes a conductive ink formulation that exploits electrochemical sintering of Zn microparticles in aqueous solutions at room temperature. This material system has relevance to emerging classes of biologically and environmentally degradable electronic devices. The sintering process involves dissolution of a surface passivation layer of zinc oxide in CH3COOH/H2O and subsequent self-exchange of Zn and Zn2+ at the Zn/H2O interface. The chemical specificity associated with the Zn metal and the CH3COOH/H2O solution is critically important, as revealed by studies of other material combinations. The resulting electrochemistry establishes the basis for a remarkably simple procedure for printing highly conductive (3 x 10(5) S m(-1)) features in degradable materials at ambient conditions over large areas, with key advantages over strategies based on liquid phase (fusion) sintering that requires both oxide-free metal surfaces and high temperature conditions. Demonstrations include printed magnetic loop antennas for near-field communication devices.
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