Abstract
We present the possibilities of 3D direct-write dispensing in the fabrication of passive UHF RFID graphene tags on a textile substrate. In our method, the graphene tag antenna is deposited directly on top of the IC strap, in order to simplify the manufacturing process by removing one step, that is, the IC attachment with conductive glue. Our wireless measurement results confirm that graphene RFID tags with printed antenna-IC interconnections achieve peak read ranges of 5.2 meters, which makes them comparable to graphene tags with epoxy-glued ICs. After keeping the tags in high humidity, the read ranges of the tags with epoxy-glued and printed antenna-IC interconnections decrease 0.8 meters and 0.5 meters, respectively. However, after drying, the performance of both types of tags returns back to normal.
Highlights
Graphene is an environmentally friendly and low-cost conductive material that has the capacity to integrate with challenging substrate materials, such as soft and stretchable textiles [1, 2]
We present the possibilities of 3D direct-write dispensing in the fabrication of passive UHF RFID graphene tags on a textile substrate
After keeping the tags in high humidity, the read ranges of the tags with epoxy-glued and printed antenna-IC interconnections decrease 0.8 meters and 0.5 meters, respectively
Summary
Graphene is an environmentally friendly and low-cost conductive material that has the capacity to integrate with challenging substrate materials, such as soft and stretchable textiles [1, 2]. For those reasons, and because of graphene’s great electrical and mechanical properties, graphene-based conductive inks have the potential to revolutionize the area of printed electronics, by replacing traditional inks with metallic components. By printing the graphene antennas directly on top of IC fixture, there is no need for a separate IC attachment step, which means more cost- and time-effective fabrication of these wireless components. The wireless performance of these tags is evaluated in normal room conditions, as well as in high humidity conditions, and compared to tags were the IC is attached with conductive glue
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