Optical modification of graphene for applications
Mika Pettersson
Department of Chemistry, Nanoscience Center, Ä¢¹½Ö±²¥, FI-40014 Jyväskylä, Finland
Abstract
Graphene and other 2D materials have many excellent properties but seldomly it is sufficient to use them as such in advanced applications. One option is to use chemical methods to modify and functionalize 2D materials. However, many applications require spatially selective functionalization and patterning. Laser-based methods offer many advantages in this regard. A common optical material modification technique is laser ablation. However, for graphene, more interesting condition is just below the ablation threshold, where non-linear excitation of material takes place.1 Under these conditions, graphene reacts with adsorbed oxygen and water present in ambient air, leading to oxidation and functionalization without breaking the carbon lattice integrity.2 Interestingly, optically induced local functionalization of graphene leads to many opportunities for development of applications via processes such as: modification of electronic properties,2 locally selective immobilization of proteins,3 area-selective atomic or molecular layer deposition,4 modification of optical properties,5 tuning of the response of sensors,6 or affecting molecular self-assembly.7 The methods can be applied for development of sensors, (opto)electronic devices, flexible and transparent electronics, bioelectronics, and so on.
In this lecture, I will present the laser-induced two-photon oxidation method of graphene, which was developed at JYU, and show examples of using it for development of various applications.
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[6] A. Lampinen et al. Phys. Chem. Chem. Phys. 25, 10778 – 10784 (2023).
[7] J. Schirmer et al. Phys. Chem. Chem. Phys. 25, 8725 – 8733 (2023).
