133257 20240410085329.0 doi 10.1021/jp301854n sideral 137900 ART-2012-137900 eng Ballesteros, Luz Marina Acetylene Used as a New Linker for Molecular Junctions in Phenylene–Ethynylene Oligomer Langmuir–Blodgett Films 2012 Langmuir and Langmuir–Blodgett films have been fabricated from an acetylene-terminated phenylene–ethynylene oligomer, namely 4-((4-((4-ethynylphenyl)ethynyl)phenyl)ethynyl)benzoic acid (HOPEA). Characterization of the Langmuir film by surface pressure vs area per molecule isotherms and Brewster angle microscopy reveals the formation of a high quality monolayer at the air–water interface. One layer Langmuir–Blodgett (LB) films were readily fabricated by the transfer of HOPEA Langmuir films onto solid substrates by the withdrawal of the substrate. The deposition mode was Z-type. Quartz crystal microbalance (QCM) experiments confirm the formation of directionally oriented, monolayer LB films, in which the HOPEA molecules are linked to the gold substrate by attachment through the acid group. The morphology of these films was analyzed by atomic force microscopy (AFM), which revealed an optimum transference surface pressure of 18 mN m–1 for the formation of homogeneous films. Cyclic voltammetry also showed a significant blockage of gold electrodes covered by HOPEA monolayers. Electrical properties of HOPEA monolayers sandwiched between a bottom gold electrode and a gold STM (scanning tunneling microscope) tip have been recorded, revealing that the acetylene group is an efficient linker for electron transport. In addition, the STM experiments indicate a nonresonant tunneling mechanism of charge transport through these metal–molecule–metal junctions. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/MICINN/CTQ2009-13024 info:eu-repo/grantAgreement/ES/MICINN/MAT2010-10846-E info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.814 2012 CHEMISTRY, PHYSICAL 28 / 134 = 0.209 2012 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 27 / 240 = 0.112 2012 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 19 / 69 = 0.275 2012 Q2 T1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Martín, Santiago Universidad de Zaragoza (orcid)0000-0001-9193-3874 Momblona, Cristina Universidad de Zaragoza (orcid)0000-0003-2953-3065 Marqués-González, Santiago López, María Carmen Universidad de Zaragoza (orcid)0000-0001-6006-4469 Nichols, Richard J. Low, Paul J. Cea, Pilar Universidad de Zaragoza (orcid)0000-0002-4729-9578 2012 755 Universidad de Zaragoza Dpto. Química Física Área Química Física 2012 X Universidad de Zaragoza Dpto. Química Física Proy. investigación HZF 116, 16 (2012), 9142-9150 J. phys. chem., C Journal of physical chemistry. C. 1932-7447 860641 http://zaguan.unizar.es/record/133257/files/texto_completo.pdf Postprint 876634 http://zaguan.unizar.es/record/133257/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:133257 articulos driver 2024-04-10-08:37:38 ARTICLE