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Lecture

On-demand Laser Printing of 2D materials and computational modelling of transfer enabling conditions

Thursday (25.06.2020)
09:20 - 09:40 Room 1
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The recent developments in the field of large area, flexible and printed electronics have utilised Laser Additive manufacturing processes, such as Laser printing and sintering. The applications are ranging from flexible displays and sensors, to biometric devices and healthcare. Flexible electronics and optoelectronics applications and devices such as flexible touch sensors, require high quality, defect free graphene. The most widely used method for the growth of high quality and large area graphene is currently Chemical Vapor Deposition (CVD), however the transfer of selected areas of the monolayer film onto a substrate of interest is a a multi step process.

 

Here we report, the use of Laser Induced Forward Transfer (LIFT) [1,2], a single step, direct, on-demand and highly precise approach of material deposition for the transfer of graphene and other 2D materials at predefined areas onto a receiver substrate. Raman Spectroscopy, Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) analysis of the transferred pixels confirms the successful transfer and the high quality printing.

 

Theoretical calculations using Density Functional Theory (DFT) are also employed to study the interaction of graphene with metallic substrates such as Cu and Ni. For a graphene flake to be detached, enough energy should be given to the system to overcome the physisorbed and chemisorbed C atoms, but to also break the C-C bonds with the rest of the graphene monolayer around the perimeter. By modelling how graphene breaks as shear forces are introduced within the sheet, we calculate the energy required to break these covalent bonds. Flexible electronics and optoelectronics applications and devices including touch sensors and more, require high quality and defect free graphene.

 

[1] S. Papazoglou, Y. S. Raptis, S. Chatzandroulis, I. Zergioti, “A study on the pulsed laser printing of liquid-phase exfoliated graphene for organic electronics”, Applied Physics A 117(1), 301-306 (2014).

[2] S. Papazoglou, C. Petridis, E. Kymakis, S. Kennou, Y. S. Raptis, S. Chatzandroulis, I. Zergioti, “In-situ sequential laser transfer and laser reduction of graphene oxide films”, Applied Physics Letters 112(18), 183301 (2018).

 

Speaker:
Prof. Dr. Ioanna Zergioti
National Technical University of Athens

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