p Band Dispersion Along Conjugated Organic Nanowires Synthesized on a Metal Oxide Semiconductor

Vasseur, G. ; Abadia, M. ; Miccio, L.A. ; Brede, J. ; Garcia-Lekue, A. ; De Oteyza, D.G. ; Rogero, C. ; Lobo-Checa, J. ; Ortega, J.E.

Resumen: Surface-confined dehalogenation reactions are versatile bottom-up approaches for the synthesis of carbonbased nanostructures with predefined chemical properties. However, for devices generally requiring low-conductivity substrates, potential applications are so far severely hampered by the necessity of a metallic surface to catalyze the reactions. In this work we report the synthesis of ordered arrays of poly(p-phenylene) chains on the surface of semiconducting TiO2(110) via a dehalogenative homocoupling of 4, 4¿- dibromoterphenyl precursors. The supramolecular phase is clearly distinguished from the polymeric one using low-energy electron diffraction and scanning tunneling microscopy as the substrate temperature used for deposition is varied. X-ray photoelectron spectroscopy of C 1s and Br 3d core levels traces the temperature of the onset of dehalogenation to around 475 K. Moreover, angle-resolved photoemission spectroscopy and tightbinding calculations identify a highly dispersive band characteristic of a substantial overlap between the precursor''s p states along the polymer, considered as the fingerprint of a successful polymerization. Thus, these results establish the first spectroscopic evidence that atomically precise carbon-based nanostructures can readily be synthesized on top of a transition-metal oxide surface, opening the prospect for the bottom-up production of novel molecule-semiconductor devices.

Idioma: Inglés

DOI: 10.1021/jacs.6b02151

Año: 2016

Publicado en: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 138, 17 (2016), 5685-5692
ISSN: 0002-7863

Factor impacto JCR: 13.858 (2016)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 10 / 166 = 0.06 (2016) - Q1 - T1

Factor impacto SCIMAGO: 7.492 - Biochemistry (Q1) - Colloid and Surface Chemistry (Q1) - Chemistry (miscellaneous) (Q1) - Catalysis (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/610446/EU/Planar Atomic and Molecular Scale devices/PAMS
Financiación: info:eu-repo/grantAgreement/EC/H2020/635919/EU/Functional materials from on-surface linkage of molecular precursors/SURFINK
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46593-C6-2-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46593-C6-4-P

Tipo y forma: Artículo (Versión definitiva)