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On-surface synthesis of chevron-like graphene nanoribbons from a molecular precursor

Houtsma, Koen (2019) On-surface synthesis of chevron-like graphene nanoribbons from a molecular precursor. Master's Thesis / Essay, Applied Physics.


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Graphene is an exciting material with excellent electronic properties, however it lacks a band gap which makes it unsuitable for application in field effect devices. By cutting the graphene into narrow strips, a band gap may be opened. Recently the possibility to create graphene nanoribbons (GNRs) with atomic precision using surface-assisted coupling has emerged. This has allowed for many interesting new possibilities, such as control over the edge termination and ribbon width. In this thesis, starting with the prochiral 6,12-dibromochrysene as a molecular precursor, we fabricated GNRs with a distinctive chevron-like shape. The structural and electronic properties of these GNRs were investigated. Using scanning tunneling spectroscopy, we measured its band gap to be 1.3 ± 0.1 eV. In addition, differential conductance maps reveal edge states in these ribbons. Based on comparison of both expiremental results and ab initio calculations, it seems likely that the chevron-like GNR has a wider band gap than an armchair-edge GNR of the same width. This opens up a possibility to tune the band gap of GNRs not only by changing its width or edge termination, but by changing its overall shape.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor nameSupervisor E mail
Degree programme: Applied Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 17 Apr 2019
Last Modified: 14 Jun 2019 10:36

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