Sheathed Molecular Junctions for Unambiguous Determination of Charge‐Transport Properties

Herrer, Lucia and Naghibi, Saman and Marín, Ivan and Ward, Jonathan S. and Bonastre, Jose María and Higgins, S. J. and Martín, Santiago and Vezzoli, Andrea and Nichols, Richard John and Serrano, José Luis and Cea, Pilar (2023) Sheathed Molecular Junctions for Unambiguous Determination of Charge‐Transport Properties. Advanced Materials Interfaces, 10 (16): 2300133. ISSN 2196-7350

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Future applications of single-molecular and large-surface area molecular devices require a thorough understanding and control of molecular junctions, interfacial phenomena, and intermolecular interactions. In this contribution the concept of single-molecule junction and host-guest complexation to sheath a benchmark molecular wire–namely 4,4′-(1,4-phenylenebis(ethyne-2,1-diyl))dianiline – with an insulating cage, pillar[5]arene 1,4-diethoxy-2-ethyl-5-methylbenzene is presented. The insertion of one guest molecular wire into one host pillar[5]arene is probed by 1H-NMR (nuclear magnetic resonance), whilst the self-assembly capabilities of the amine-terminated molecular wire remain intact after complexation as demonstrated by XPS (X-ray photoelectron spectroscopy) and AFM (atomic force microscopy). Encapsulation of the molecular wire prevents the formation of π- π stacked dimers and permits the determination of the true single molecule conductance with increased accuracy and confidence, as demonstrated here by using the STM–BJ technique (scanning tunneling microscopy– break junction). This strategy opens new avenues in the control of single-molecule properties and demonstrates the pillararenes capabilities for the future construction of arrays of encapsulated single-molecule functional units in large-surface area devices.

Item Type:
Journal Article
Journal or Publication Title:
Advanced Materials Interfaces
Uncontrolled Keywords:
Research Output Funding/yes_externally_funded
?? host-guest complexesmolecular wirescanning tunneling microscopy-break junction methodsingle molecule conductanceyes - externally fundedmechanics of materialsmechanical engineering ??
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Deposited On:
15 May 2023 16:05
Last Modified:
27 Nov 2023 12:30