Laser printing and functionalisation of sensors
2015-04-22 14:30 - 16:30 | MC B1 303 http://plan.epfl.ch/?zoom=20&recenter_y=5941676.64687&recenter_x=773242.30399&layerNodes=fonds,batiments,labels,information,parkings_publics,arrets_metro,transports_publics&floor=1&q=MCB1_303
Ioanna Zergioti, National Technical University of Athens, Physics Department, Iroon Polytechneiou 9, 15780 Zografou, Athens, Greece
During the last decade, laser based techniques have received significant attention as direct, cost-effective and high resolution printing/patterning techniques applied in a variety of applications including sensors, microelectronic devices, cell printing, etc.. Among them, Laser Induced Forward Transfer (LIFT) exhibits inherent advantages, in terms of high spatial resolution of the printed and/or processed patterns, enabling the maskless (direct) deposition of highly resolved features of materials including biomolecules, and Carbon nanotubes (CNTs), which can serve as sensing elements of chemical and bio-sensors. The versatility that LIFT presents, offers the capability of its implementation for the fabrication of a variety of sensing devices, i.e. resistive, amperometric, transistor-based, optical sensing, and on different substrates. It is also used as an advanced functionalization process of the sensors surface without the need for intermediate layers, or chemical functionalization techniques, that often require treatment with toxic solvents and hazardous chemicals. In this work, examples of chemical and biosensors fabricated based on the LIFT technique will be presented. In particular photosynthetic, enzymatic, and DNAzymebiosensors will be presented for the detection of hazardous contaminants in food products and water. In addition, laser based fabrication of chemical sensors with sensing elements CNTs, usually in the form of polymer composites, or graphene and other graphene-based materials (graphene oxide, reduced graphene oxide) used for the detection of humidity and organic volatile compounds (ethanol, xylene) will be shown.
