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:

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)

Creative Commons You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.


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