Additive Manufacturing of Graphene for Identiﬁcation and Sensing Applications
|Kustantaja||Tampere University of Technology|
|Tila||Julkaistu - 6 lokakuuta 2017|
|Nimi||Tampere University of Technology. Publication|
This thesis investigates the possibilities of novel manufacturing methods for patterning graphene-based layer on versatile substrates. Graphene is a novel nanomaterial, which has gained a huge attraction due to extraordinary mechanical and electrical properties. In this work, graphene has been introduced as a promising candidate for environmentally-friendly and cost-effective wireless platforms.
The focus of the research has been mostly on patterning and fabrication details. The used manufacturing methods are inkjet printing, doctor blade, and 3D direct writing. Additionally, required surface treatments and post treatments are investigated, which needed to be optimized according to ink and substrate materials properties. For instance, the inkjet printed graphene oxide needs annealing and a subsequent reduction process. This can be done using elevated temperature or under pulsed Xenon ﬂashes. On the other hand, graphene inks require just one step curing process. This curing step can be carried out in a conventional oven or photonically by pulsed Xenon ﬂashes.
The results indicate that graphene inks have a great potential for fabricating antennas and RFID tags for sensing and identiﬁcation applications. In this work, the graphene passive UHF RFID tags are manufactured and characterized. Then the wireless properties are evaluated which show acceptable read range values over the UHF band. In addition, the tags show excellent reliability at high humidity and harsh bending conditions. This indicates the great potential of graphene based tags in wireless identiﬁcation and sensing platforms.