abstract
One of the challenges for the realization of molecular electronics is the design of nanoscale molecular wires displaying long-range charge transport. Graphene nanoribbons are an attractive platform for the development of molecular wires with long-range conductance owing to their unique electrical properties. Despite their potential, the charge transport properties of single nanoribbons remain underexplored. Herein, we report a synthetic approach to prepare N-doped pyrene-pyrazinoquinoxaline molecular graphene nanoribbons terminated with diamino anchoring groups at each end. These terminal groups allow for the formation of stable molecular graphene nanoribbon junctions between two metal electrodes that were investigated by scanning tunneling microscope-based break-junction measurements. The experimental and computational results provide evidence of long-range tunneling charge transport in these systems characterized by a shallow conductance length dependence and electron tunneling through >6 nm molecular backbone.
keywords
LADDER-TYPE; CONDUCTANCE; PYRENE; LONG; TRANSPORT; WIRES; NANOGRAPHENE; HYDROCARBONS; TRANSITION
subject category
Chemistry
authors
Marongiu, M; Ha, T; Gil-Guerrero, S; Garg, K; Mandado, M; Melle-Franco, M; Diez-Perez, I; Mateo-Alonso, A
our authors
Manuel Melle-Franco
Principal Researcher
Sara Gil Guerrero
Post-Doc FellowshipProjects
Projeto de Investigação Exploratória: Manuel Melle (IF Manuel Melle)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
This work was carried out with support from the Basque Science Foundation for Science (Ikerbasque), POLYMAT, the University of the Basque Country, Diputacion de Guipuzcoa, Gobierno Vasco (PIBA_2022_1_0031 and BERC programme), and Gobierno de Espana (Projects PID2021-124484OB-I00 and CEX2020-001067-M financed by MCIN/AEI/10.13039/501100011033). This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 722951). This work was funded by the European Union under the Horizon Europe grant 101046231. Project (PCI2022-132921) funded by the Agencia Estatal de Investigacion through the PCI 2022 and M-ERA.NET 2021 calls. Technical and human support provided by SGIker of UPV/EHU is acknowledged. I.D.-P. acknowledges the European Research Council (ERC Fields4CAT 772391) and the UKRI (BBSRC grant BB/W014327/1) for financial support. Support through the project IF/00894/2015 and within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020, and LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC) is gratefully acknowledged. This project has received funding from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 964593. Financial support by Xunta de Galicia through the project GRC2019/24 is also acknowledged. S.G.-G. acknowledges support from the Margarita Salas Uvigo postdoctoral grants funded by the Spanish Ministry of Universities with European Union funds-NextGenerationEU.