Towards molecular electronic devices based on ‘all-carbon'' wires
Resumen: Nascent molecular electronic devices based on linear ‘all-carbon'' wires attached to gold electrodes through robust and reliable C-Au contacts are prepared via efficient in situ sequential cleavage of trimethylsilyl end groups from an oligoyne, Me3Si-(CC)4-SiMe3 (1). In the first stage of the fabrication process, removal of one trimethylsilyl (TMS) group in the presence of a gold substrate, which ultimately serves as the bottom electrode, using a stoichiometric fluoride-driven process gives a highly-ordered monolayer, AuCCCCCCCCSiMe3 (AuC8SiMe3). In the second stage, treatment of AuC8SiMe3 with excess fluoride results in removal of the remaining TMS protecting group to give a modified monolayer AuCCCCCCCCH (AuC8H). The reactive terminal CC-H moiety in AuC8H can be modified by ‘click'' reactions with (azidomethyl)ferrocene (N3CH2Fc) to introduce a redox probe, to give AuC6C2N3HCH2Fc. Alternatively, incubation of the modified gold substrate supported monolayer AuC8H in a solution of gold nanoparticles (GNPs), results in covalent attachment of GNPs on top of the film via a second alkynyl carbon-Au s-bond, to give structures AuC8GNP in which the monolayer of linear, ‘all-carbon'' C8 chains is sandwiched between two macroscopic gold contacts. The covalent carbon-surface bond as well as the covalent attachment of the metal particles to the monolayer by cleavage of the alkyne C-H bond is confirmed by surface- enhanced Raman scattering (SERS). The integrity of the carbon chain in both AuC6C2N3HCH2Fc systems and after formation of the gold top-contact electrode in AuC8GNP is demonstrated through electrochemical methods. The electrical properties of these nascent metal-monolayer-metal devices AuC8GNP featuring ‘all-carbon'' molecular wires were characterised by sigmoidal I-V curves, indicative of well-behaved junctions free of short circuits.
Idioma: Inglés
DOI: 10.1039/c8nr02347f
Año: 2018
Publicado en: NANOSCALE 10, 29 (2018), 14128-14138
ISSN: 2040-3364

Factor impacto JCR: 6.97 (2018)
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 41 / 293 = 0.14 (2018) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 20 / 94 = 0.213 (2018) - Q1 - T1
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 26 / 172 = 0.151 (2018) - Q1 - T1
Categ. JCR: PHYSICS, APPLIED rank: 18 / 148 = 0.122 (2018) - Q1 - T1

Factor impacto SCIMAGO: 2.396 - Nanoscience and Nanotechnology (Q1) - Materials Science (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E54
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2016-78257-R
Financiación: info:eu-repo/grantAgreement/ES/UZ/JIUZ-2016-CIE-04
Tipo y forma: Article (Published version)
Área (Departamento): Área Química Física (Dpto. Química Física)

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