Galvanic process for making printed conductive metal markings for chipless rfid applications

Abstract

A process for printing a metal wire pattern on a substrate, including: printing a first salt solution including a metal ion that will undergo a reduction half-reaction; printing a second salt solution containing an oxidizing agent that will undergo an oxidation half-reaction in contact with the first salt solution, resulting in the reduction of the metal ions of the first salt solution; and allowing the first and second salt solutions to react by a galvanic reaction, causing reduced metal ions of the first salt solution to precipitate as a solid, on the substrate.

Description

technical field [0001] The present disclosure relates to a method for printing wiring patterns on substrates used as resonant antennae in chipless RFID applications, using a printing method whereby desired patterns are placed on top of each other Printing of two salt solutions triggers a spontaneous electrochemical reaction and induces precipitation and deposition of reduced metal particles at the interface of the two salt solutions. Background technique [0002] Recently, radio frequency identification (RFID) technology has gained enormous popularity as a device for storing and transmitting information. RFID technology uses a tag transponder located on an object, and a reader, also referred to herein as an interrogator, to read and identify the tag. RFID technology is broadly categorized according to the use of "active" tags or "passive" tags. Active tags have a local power source (such as a battery) so that the active tag transmits a signal to be read by the interrogator...

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