SEMINAIRE DCMI – Labex NIE
« Dynamic Spray-Gun Deposition method for applications »
In charge of the transverse topic on nanomaterials,
Thales Research and Technology, Palaiseau, France
Spray gun deposition can be used to fabricate sensors, supercapacitors, flexible memories and conformable Electro-Magnetic Shielding (EMS) layers. Specifically, a mixture of graphene and carbon nanotubes (CNTs) that are acting as a sort of spacers to avoid the restacking of graphene, is used to make new-generation supercapacitors’ electrodes. The latter are characterized by a high conductivity allowing an impressive specific power value of ca. 100kW/Kg. Ionic liquid is also used to increase the energy storage efficacy. Parallel, Graphene Oxide/Carbon Nanofibers-based memories show bipolar behavior and have been cycled 10000 times. They constitute one of the first example of information storage device that can be fabricated using a roll-to-roll implementable method. These devices can open new horizons in the integration of memories for examples in RFID tags or in packages. Finally, embedding several layers of graphene, MWCNTs and carbon nanofibers between polymers X-band frequencies can be absorbed mimicking EMS layers. This is a real breakthrough considering that usually heavy metals are used as ‘trapping’ material, hence, opening the door to new-generations eco-friendly devices.