Pyrene-terminated self-assembled monolayers on Au substrate

• Verfasst von: Liu, Yangbiao [VerfasserIn]
• Verfasst von: Notz, Sebastian [VerfasserIn]
• Verfasst von: Lang, Heinrich [VerfasserIn]
• Verfasst von: Zharnikov, Michael [VerfasserIn]
• Titel: Pyrene-terminated self-assembled monolayers on Au substrate
• Titelzusatz: molecular organization and charge transport properties
• Verf.angabe: Yangbiao Liu, Sebastian Notz, Heinrich Lang, and Michael Zharnikov
• E-Jahr: 2023
• Jahr: 28 September 2023
• Umfang: 11 S.
• Illustrationen: Illustrationen
• Fussnoten: Online veröffentlicht: 19. September 2023 ; Gesehen am 23.11.2023
• Titel Quelle: Enthalten in: The journal of physical chemistry <Washington, DC> / C
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2023
• Band/Heft Quelle: 127(2023), 38 vom: Sept., Seite 19290-19300
• ISSN Quelle: 1932-7455
• DOI: doi:10.1021/acs.jpcc.3c05201
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1870987837

Abstract

Molecular organization and charge transport properties of custom-designed self-assembled monolayers (SAMs) of pyrene-substituted alkanethiolates on Au(111) were studied. These SAMs feature either a long alkyl linker (Pyr-C12) or a shorter alkylthioether linker (Pyr-C4S2). They are characterized by homogeneous anchoring to the substrate, dense molecular packing, and exceptional orientational order, emphasized by the very small inclination of the terminal pyrenyl groups, the identity of which was unequivocally verified by X-ray absorption spectroscopy. The specific character of these groups is also reflected in the work function and wetting properties of the SAMs. Analysis of the charge transport data suggests a higher conductance of pyrene groups compared to the alkyl chain of the same length and a negative effect of the S heteroatoms on the conductance of the alkyl linker. The SAMs, embedded in a two-terminal junction with the top eutectic GaIn electrode, exhibit either no (Pyr-C12) or weak (Pyr-C4S2) rectification behavior. This difference was tentatively ascribed to the different orientations and organizations of the terminal pyrenyl groups in both monolayers.