Quasi one-dimensional band dispersion and surface metallization in long-range ordered polymeric wires
Vasseur, Guillaume, Fagot-Revurat, Yannick, Sicot, Muriel, Kierren, Bertrand, Moreau, Luc, Malterre, Daniel, Cardenas, Luis, Galeotti, Gianluca, Lipton-Duffin, Josh, Rosei, Federico, Di Giovannantonio, Marco, Contini, Giorgio, Le Fevre, Patrick, Bertran, Francois, Liang, Liangbo, Meunier, Vincent, & Perepichka, Dmitrii F. (2016) Quasi one-dimensional band dispersion and surface metallization in long-range ordered polymeric wires. Nature Communications, 7, Article Number-10235.
On-surface covalent self-assembly of organic molecules is a very promising bottom-up approach for producing atomically controlled nanostructures. Due to their highly tuneable properties, these structures may be used as building blocks in electronic carbon-based molecular devices. Following this idea, here we report on the electronic structure of an ordered array of poly(para-phenylene) nanowires produced by surface-catalysed dehalogenative reaction. By scanning tunnelling spectroscopy we follow the quantization of unoccupied molecular states as a function of oligomer length, with Fermi level crossing observed for long chains. Angle-resolved photoelectron spectroscopy reveals a quasi-1D valence band as well as a direct gap of 1.15[thinsp]eV, as the conduction band is partially filled through adsorption on the surface. Tight-binding modelling and ab initio density functional theory calculations lead to a full description of the band structure, including the gap size and charge transfer mechanisms, highlighting a strong substrate-molecule interaction that drives the system into a metallic behaviour.
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|Item Type:||Journal Article|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Electronic and Magnetic Properties of Condensed Matter; Superconductivity (020404)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Surfaces and Structural Properties of Condensed Matter (020406)
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||30 Jun 2016 01:06|
|Last Modified:||12 Jul 2016 23:40|
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