Oriented growth of porphyrin-based molecular wires on ionic crystals analysed by nc-AFM

Glatzel, Thilo; Zimmerli, Lars; Kawai, Shigeki; Meyer, Ernst; Fendt, Leslie-Anne; Diederich, François

doi:10.3762/bjnano.2.4

Cited by 21 publications

(21 citation statements)

References 38 publications

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“…Taking a molecule density of 0.72 nm −2 [31] results in an average dipole moment density difference per molecule of 0.36 D. This is a reasonable value in comparison with the absolute dipole moment of a single porphyrin of 4.37 D. However, the well-known averaging effect [52] in KPFM measurements at very close proximity to the surface (<1 nm) has to [47] be considered and the absolute values can be assumed to be a lower limit for the dipole moment.…”

Section: Contacting Porphyrin Structuresmentioning

confidence: 89%

“…The immobilization of the porphyrin molecules is due to electrostatic interaction between the cyanophenyl group and the ionic surface, which yields stable, defect-free molecular aggregates [30,31]. A similar behavior was also found for porphyrins deposited on thin alkali halide films [47]. In contrast to the parallel orientation of porphyrin molecules deposited on metal surfaces [48], they are tilted on KBr by 35°-45°with respect to the surface.…”

mentioning

confidence: 80%

“…The structure of the irradiated pattern is still apparent, and decorated steps are clearly visible. Atomic resolution was obtained on flat terraces, inside the pits, and sometimes also close to the molecular structures [11,31,47]. This large-scale topographical image highlights also that only the straight step edges are decorated by porphyrins.…”

Section: Deposition Of Porphyrins On Insulating Surfacesmentioning

confidence: 99%

“…The two 3,5-di(tert-butyl)phenyl side groups of the molecule are determining the tilting of the wire parallel and perpendicular to the step edge. Along one and two monolayer step edges, single-molecular wires are found, while at higher steps, disordered aggregates of molecules appear [47].…”

Section: Deposition Of Porphyrins On Insulating Surfacesmentioning

confidence: 99%

“…2 the self-assembly and the stabilization of porphyrin molecules was presented. The stabilization at room temperature occurred due to π-π interaction between the cores of the molecules, while the substrate interaction controlled the absorption of the assemblies on ionic surfaces [47]. To allow an even stronger molecule surface interaction, stronger localized and directed dipole moments are necessary.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Mechanical and Electrical Properties of Single Molecules

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Molecular systems and devices are an strongly emerging technology. Various devices are already available, while others are still under development. The usage of molecules offers a great advantage to Si-based electronics, the functional groups of the molecules are adoptable allowing to artificially generate a huge variety of different properties and functionalities. However, the fundamental requirements of molecular engineering are not fully developed yet, mainly wellknown molecules with limited functionality are used nowadays. To analyze and create new molecular structures providing, for example, a very high extinction coefficient while maintaining the chemical structure under environmental conditions would allow to create new types of solar cell conversion devices. This chapter introduces and reviews the research activities of the Nanolino-group at the University of Basel in the active field of the usage of scanning probe microscopy techniques to characterize the mechanical and electrical properties of molecular assemblies down to single molecules.

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Section: Contacting Porphyrin Structuresmentioning

confidence: 89%

mentioning

confidence: 80%

Section: Deposition Of Porphyrins On Insulating Surfacesmentioning

confidence: 99%

Section: Deposition Of Porphyrins On Insulating Surfacesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

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Imaging and Manipulation of Adsorbates Using Dynamic Force Microscopy

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Tuning Molecular Self‐Assembly on Bulk Insulator Surfaces by Anchoring of the Organic Building Blocks

Rahe¹,

Kittelmann²,

Nimmrich³

et al. 2013

Advanced Materials

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Molecular self-assembly constitutes a versatile strategy for creating functional structures on surfaces. Tuning the subtle balance between intermolecular and molecule-surface interactions allows structure formation to be tailored at the single-molecule level. While metal surfaces usually exhibit interaction strengths in an energy range that favors molecular self-assembly, dielectric surfaces having low surface energies often lack sufficient interactions with adsorbed molecules. As a consequence, application-relevant, bulk insulating materials pose significant challenges when considering them as supporting substrates for molecular self-assembly. Here, the current status of molecular self-assembly on surfaces of wide-bandgap dielectric crystals, investigated under ultrahigh vacuum conditions at room temperature, is reviewed. To address the major issues currently limiting the applicability of molecular self-assembly principles in the case of dielectric surfaces, a systematic discussion of general strategies is provided for anchoring organic molecules to bulk insulating materials.

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Self-assembly of Organic Molecules on Insulating Surfaces

Kling

Bechstein

Rahe

et al. 2015

Noncontact Atomic Force Microscopy

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Molecular self-assembly is known to provide a powerful tool for creating functional structures, with the ultimate structure and functionality encoded in the molecular building blocks. Upon molecule deposition onto surfaces, functional structures have been created ranging from defect-free, highly symmetric two-dimensional layers to complex assemblies with dedicated functionality. Especially organic molecules play a key role for molecular self-assembly due to their impressive structural flexibility and the high degree of control by chemical synthesis. Furthermore, the surface itself provides another exciting dimension: adjusting the subtle balance between intermolecular and molecule-surface interactions allows creating a broad variety of structures and explains the great success when confining molecular self-assembly to surfaces. While most of the structures realized so far have been fabricated on metallic substrates, comparatively little is known about molecular self-assembly on insulating surfaces. However, extending the materials basis to insulating substrates is of increasing interest to benefit from self-assembly strategies for emerging technologies such as molecular (opto)electronics. For the latter and further related applications, decoupling of the electronic structure from the underlying substrate is mandatory for the device functionality. Moreover, future applications will require the molecular structure to be stable at room temperature rather than at low temperatures. On insulating support surfaces, however, most attempts to create self-assembled molecular structures at room temperature have been hampered by the weak molecule-surface interactions. Thus, considerable effort has been made to establish means for increasing

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Oriented growth of porphyrin-based molecular wires on ionic crystals analysed by nc-AFM

Cited by 21 publications

References 38 publications

Mechanical and Electrical Properties of Single Molecules

Mechanical and Electrical Properties of Single Molecules

Tuning Molecular Self‐Assembly on Bulk Insulator Surfaces by Anchoring of the Organic Building Blocks

Self-assembly of Organic Molecules on Insulating Surfaces

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