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Chevron-based graphene nanoribbon heterojunctions : Localized effects of lateral extension and structural defects on electronic properties

Title data

Costa, Paulo S. ; Teeter, Jacob D. ; Enders, Axel ; Sinitskii, Alexander:
Chevron-based graphene nanoribbon heterojunctions : Localized effects of lateral extension and structural defects on electronic properties.
In: Carbon. Vol. 134 (2018) . - pp. 310-315.
ISSN 0008-6223
DOI: https://doi.org/10.1016/j.carbon.2018.03.054

Abstract in another language

Graphene nanoribbon (GNR) heterojunctions have been synthesized by a bottom-up approach on an Au (111) substrate from a mixture of two structurally similar but visually distinct chevron-type molecular precursors. The resulting heterojunctions were composed of the units of chevron GNRs (cGNRs) and new laterally extended chevron GNRs (eGNRs), which contained an additional benzene ring. Because of their intentional visual difference, cGNR and eGNR units could be conveniently distinguished in scanning tunneling microscopy images. Differential conductance (dI/dV) mapping of GNR heterojunctions revealed differences in electronic structures of cGNRs and eGNRs. Interestingly, the characteristic conduction band states of cGNRs in the dI/dV maps were shown to be sensitive to the effects of both lateral extension of ribbons and the edge defects, emphasizing the importance of synthesizing GNRs and GNR heterojunctions with atomic precision. The dI/dV maps further showed that both effects could be localized within the corresponding GNR units even if they are bonded to structurally and electronically different neighbors, which suggests a possibility of engineering complex GNR-based electronic nanostructures with nanoscale modulation of properties. The new eGNR units could be potentially combined with other chevron-type GNRs, such as nitrogen-doped cGNRs, into a variety of new GNR heterojunctions.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Graphene nanoribbons; Heterojunctions; On-surface synthesis; Scanning tunneling; microscopy; Local density of states
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik XI - Funktionelle Nanostrukturen
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik XI - Funktionelle Nanostrukturen > Lehrstuhl Experimentalphysik XI - Funktionelle Nanostrukturen - Univ.-Prof. Dr. Axel Enders
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 11 Oct 2019 07:12
Last Modified: 11 Oct 2019 07:12
URI: https://eref.uni-bayreuth.de/id/eprint/52721