The atomically precise control over the size, shape and structure of nanographenes (NGs) or the introduction of heteroatom dopants into their sp2 -carbon lattice confer them valuable electronic, optical and magnetic properties. Herein, we report on the design and synthesis of a hexabenzocoronene derivative embedded with graphitic nitrogen in its honeycomb lattice, achieved via on-surface assisted cyclodehydrogenation on the Au(111) surface. Combined scanning tunnelling microscopy/spectroscopy and non-contact atomic force microscopy investigations unveil the chemical and electronic structures of the obtained dicationic NG. Kelvin probe force microscopy measurements reveal a considerable variation of the local contact potential difference toward lower values with respect to the gold surface, indicative of its positive net charge. Altogether, we introduce the concept of cationic nitrogen doping of NGs on surfaces, opening new avenues for the design of novel carbon nanostructures.

Center for Advancing Electronics and Faculty of Chemistry and Food Chemistry Technical University of Dresden 01062 Dresden Germany

Departamento de Física de la Materia Condensada Universidad Autónoma de Madrid 28049 Madrid Spain

Department of Condensed Matter Physics Faculty of Mathematics and Physics Charles University CZ 180 00 Praha Czech Republic

IMDEA Nanoscience C Faraday 9 Campus de Cantoblanco 28049 Madrid Spain

Institute of Physics of the Czech Academy of Science CZ 16253 Praha Czech Republic

Instituto de Ciencia de Materiales de Madrid CSIC Cantoblanco 28049 Madrid Spain

Regional Centre of Advanced Technologies and Materials Palacký University Olomouc CZ 771 46 Olomouc Czech Republic

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