journal article·2024-07-02Open access

Electronic Decoupling and Hole-Doping of Graphene Nanoribbons on Metal Substrates by Chloride Intercalation

Amogh Kinikar, Thorsten G. Englmann, Marco Di Giovannantonio, Nicolò Bassi, Feifei Xiang, Samuel Stolz, Roland Widmer, Gabriela Borin Barin, Elia Turco, Kristjan Eimre, Néstor Merino Díez, Andres Ortega-Guerrero, Xinliang Feng, Oliver Gröning, Carlo A. Pignedoli, Roman Fasel, Pascal Ruffieux

ACS Nano· Volume 18· Issue 26

Abstract

Atomically precise graphene nanoribbons (GNRs) have a wide range of electronic properties that depend sensitively on their chemical structure. Several types of GNRs have been synthesized on metal surfaces through selective surface-catalyzed reactions. The resulting GNRs are adsorbed on the metal surface, which may lead to hybridization between the GNR orbitals and those of the substrate. This makes investigation of the intrinsic electronic properties of GNRs more difficult and also rules out capacitive gating. Here, we demonstrate the formation of a dielectric gold chloride adlayer that can intercalate underneath GNRs on the Au(111) surface. The intercalated gold chloride adlayer electronically decouples the GNRs from the metal and leads to a substantial hole-doping of the GNRs. Our results introduce an easily accessible tool in the in situ characterization of GNRs grown on Au(111) that allows for exploration of their electronic properties in a heavily hole-doped regime.
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Research context

OpenAlex topics: Graphene research and applications · Molecular Junctions and Nanostructures · Surface Chemistry and Catalysis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

nanotech@surfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland

Center for Advancing Electronics Dresden & Faculty of Chemistry and Food Chemistry, TU Dresden, Dresden 01062, Germany

Laboratory of Nanostructures at Surfaces, Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland

Max Planck Institute of Microstructure Physics, Weinberg 2, Halle 06120, Germany

Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern 3012, Switzerland

Funding

Werner Siemens-Stiftung · Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung · Deutsche Forschungsgemeinschaft · Max-Planck-Gesellschaft

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