12/16/2023 0 Comments Printed rfid![]() ![]() Inkjet-printing and doctor-blading methods are complementary, the former having high accuracy and cost, in contrast to the latter. For antenna printing applications, spraying is a less reported method, suffering from lacking of flatness in films. Graphene ink, a dispersion of graphene flakes in solvents, can be easily patterned via spraying 15, screen printing 16, inkjet-printing 17, 18 and doctor-blading 19 techniques. ![]() ![]() The printed electronics industry has long been crying out for low-cost highly conductive inks. The extremely high junction resistance between CNTs results in lower surface conductivity and hinders their applications 14. Carbon nanotubes (CNTs) were once seen as an alternative for metal nanoparticles. This technique is however both chemically and thermally unstable 13. Conductive polymers can also be fabricated as conductive film. However, in the case of heat-sensitive substrates (paper, plastic, etc.), sintering cannot be applied. To avoid oxidation, a sintering process is necessary after printing 11, 12. Other metal nanoparticles such as copper or aluminium are much cheaper but can be easily oxidized. However, silver is too expensive to be employed for low-cost applications 10. Silver nanoparticle inks are widely used because of their high conductivity and good levelling property. As conductor is the core component in printed electronics, efforts have been mainly focused on providing highly conductive metal nanoparticle inks, especially using silver nanoparticles 9. Printing with our ink results in very high conductivity (7.13 × 10 4 S m −1) devices, which allows us to produce wireless connectivity antenna operational from MHz to tens of GHz, which can be used for wireless data communication and energy harvesting, which brings us very close to the ubiquitous use of printed graphene technology for such applications.ĭevelopment of printed conductive inks for electronic applications has grown rapidly due to widening applications in transistors 1, sensors 2, antennas 3, 4, radio frequency identification (RFID) 5, 6, 7 tags, wearable electronics 8, etc. The use of non-toxic solvent Dihydrolevoglucosenone (Cyrene) significantly speeds up and reduces the cost of the liquid phase exfoliation of graphite. Here we report the environmentally sustainable route of production of graphene ink suitable for screen-printing technology. Inks based on graphene have a chance to dominate this technology, as they potentially can be low cost and applied directly on materials like textile and paper. The possibility of printing electronic circuits will further promote the spread of the Internet of Things applications. Printed electronics offer a breakthrough in the penetration of information technology into everyday life. ![]()
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