Luca Camilli: Self-assembly of ordered graphene nanodot arrays

posted 31 May 2017, 01:48 by Peter Boggild
Luca Camilli(1), Jakob Jørgensen(2), Jerry Tersoff(3), Adam Stoot(1), Richard Balog(2), Andrew Cassidy(2),
Jerzy T. Sadowski(4), Peter Bøggild(1) & Liv Hornekær(2)
1 Center for Nanostructured Graphene (CNG), DTU Nanotech, Technical University of
Denmark, DK-2800, Kongens Lyngby, Denmark
2 Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
3 IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA
4 Center for Functional Nanomaterials, Brookhaven National Lab, Upton, New York 11973,
USA

The ability to fabricate nanoscale domains of uniform size in two-dimensional (2D) materials could potentially enable new applications in nanoelectronics and the development of innovative metamaterials. However, achieving even minimal control over the growth of 2D lateral heterostructures at such extreme dimensions has proven exceptionally challenging. Here we show the spontaneous formation of ordered arrays of graphene nano-domains (dots), epitaxially embedded in a 2D boron-carbon-nitrogen alloy [1]. These dots exhibit a strikingly uniform size of 1.6nm ± 0.2nm and strong ordering, and the array periodicity can be tuned by adjusting the growth conditions. We explain this behaviour with a model incorporating dot-boundary energy, a moiré-modulated substrate interaction, and long-range repulsion between dots. This new 2D material, which theory predicts to be an ordered composite of uniform-size semiconducting graphene quantum dots laterally integrated within a larger-bandgap matrix, holds promise for novel electronic and optoelectronic properties, with a variety of potential device applications.

[1] Camilli L. et al., Nature Communications 2017, in press

Luca Camilli is currently a Marie Curie Fellow at the Danish Technical University (Denmark). His research focuses on growth and electronic characterization of 2D materials and their heterostructures. He received his M.S. degree in Materials Science and Technology (2009) and a Ph.D. in Physics (2012) from the University of Rome "Tor Vergata" (Italy), where he was working with carbon nanotubes. After finishing his Ph.D, he spent 6 months as a postdoctoral researcher in the Laboratory of Condensed Matter Physics at the University of Rome "Tor Vergata", before joining the group of Dr. P. Sutter at Brookhaven National Laboratory (USA), where he started working with 2D materials. After one year, he joined the group of Prof. P. Bøggild at the Danish Technical University (Denmark). His awards include a DFF Mobilex postdoctoral fellowship and the Marie Curie Independent European Fellowship (MC-IEF
).


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