Functionalization of 2D materials: a molecular approachSteven De Feyter

a KU Leuven, Department of Chemistry, Division of Molecular Imaging and Photonics, Celestijnenlaan 200F, B-3001 Leuven (Belgium)

Email: steven.defeyter@kuleuven.beAbstract:

In this presentation, I will focus on the functionalization of graphite and graphene using twoapproaches. A first approach is based on molecular self-assembly at the interface between a liquid orair, and graphite or graphene. I will discuss concepts of nanostructuring emphasizing the effect ofsolvent, solute concentration and temperature, stimulus-driven self-assembly and self-assembly undernanoconfinement conditions. A second approach is based on grafting molecules on graphite orgraphene via covalent chemistry. In addition to a discussion on the functionalization principles, it willbe demonstrated how also nanolithography can be used to nanostructure such covalently modifiedsurfaces.

Advanced interface specific methods such as scanning tunnelling microscopy (STM) and atomic forcemicroscopy (AFM) provide structural and other types of information at the nanoscopic level.

Various applications will be presented, including molecule modified graphene field effect transistors.

Combined nanolithographic, covalent and non-covalent functionalization.

References:

[1] S.-L. Lee, Y. Fang, G. Velpula, F. P. Cometto, M. Lingenfelder, K. Müllen, K. S. Mali, S. De Feyter, ACS Nano,2015, 9, 12, 11608 - 11617

[2] Y. Fang, E. Ghijsens, O. Ivasenko, H. Cao, A. Noguchi, K. S. Mali, K. Tahara, Y. Tobe, S. De Feyter, NatureChemistry, 2016, 8, 711–717

[3] A. M. Bragança, J. Greenwood, O. Ivasenko, T. Hai Phan, K. Müllen, S. De Feyter, Chemical Science, 2016, 7,7028-7033

[4] L. Verstraete, J. Greenwood, B. E. Hirsch, S. De Feyter, ACS Nano, 2016, 10, 10706-10715

[5] G. Velpula, T. Takeda, J. Adisoejoso, K. Inukai, K. Tahara, K. S. Mali, Y. Tobe and S. De Feyter, ChemComm,2017, 53, 1108-1111

[6] L. Verstraete, B. E. Hirsch, J.Greenwood and S. De Feyter, Chem. Commun., 2017, 53, 4207-4210

[7] J. Seibel, L Verstraete, B. E. Hirsch, A. M. Bragança and S. De Feyter, J. Am. Chem. Soc., 2018, 140, 11565–11568