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Aitor Mugarza: Tailoring structural and electronic properties of graphene nanostructures with atomic precision

posted 1 May 2019, 07:40 by Peter Boggild   [ updated 1 May 2019, 07:50 ]
Atomic manipulation and Spectroscopy group, Catalan Institute of Nanoscience and Nanotechnology, ICN2, ES

Nanostructuring graphene confers multiple functionalities to this material, making it attractive to very diverse applications in electronics, molecular sensing and filtering. For instance, semiconducting gaps can be induced by reducing its dimensions to the nanometer scale, whereas introducing pores of similar sizes turns impermeable graphene into the most efficient molecular sieve membrane. In both cases, the interesting scale for applications is below 3-5 nm, a regime where bottom-up synthesis can be particularly efficient. 

Here I report different on-surface methods to grow graphene quantum dots with controlled shape and edge structure [1], periodic arrays of nanoribbons with lengths exceeding 100 nm [2], and nanoporous graphene sheets that combine 1 nm size ribbons and pores [3]. Their novel electronic states are correlated with the particular atomic structures by using STM. Their potential application in devices is illustrated by gate modulated transport measurements in nanoporous graphene sheets.

[1] S. O. Parreiras et al., 2D Mater., 4 25104 (2017).
[2] C. Moreno et al., Chem. Commun. 54, 9402 (2018).
[3] C. Moreno et al, Science (80-. ). 360, 199 (2018).Catalan Institute of Nanoscience and Nanotechnology

Professor Aitor Mugarza received his PhD in Physics both at the University of Basque Country. After his doctoral studies, he worked at the Lawrence Berkeley National Laboratory, USA, and at the Materials Science Institute of Barcelona (ICMAB) as a Marie Curie Fellow. He is currently ICREA research professor and group leader at the Catalan Institute of Nanoscience and Nanotechnology (ICN2). He is author of 65+ articles, and of 45+ invited talks at international conferences, universities and schools in the field of electronic and magnetism in low dimensional materials. His current research interest is focused on the bottom-up synthesis of 2D organic and hybrid materials and the engineering of their quantum properties.