Formation of molecular wires on nanostructured KBr

Zimmerli, Lars; Maier, Sabine; Glatzel, Thilo; Gnecco, Enrico; Pfeiffer, Olivier; Diederich, François; Fendt, Leslie-Anne; Meyer, Ernst

doi:10.1088/1742-6596/61/1/268

Cited by 18 publications

(34 citation statements)

References 10 publications

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“…Evaporating the cyano-porphyrins onto the bulk KBr(001) surface results, as also reported earlier [25–26], in the formation of molecular wires. Fig.…”

Section: Resultssupporting

confidence: 87%

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

Glatzel¹,

Zimmerli²,

Kawai³

et al. 2011

Beilstein J. Nanotechnol.

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SummaryThe growth of molecular assemblies at room temperature on insulating surfaces is one of the main goals in the field of molecular electronics. Recently, the directed growth of porphyrin-based molecular wires on KBr(001) was presented. The molecule–surface interaction associated with a strong dipole moment of the molecules was sufficient to bind them to the surface; while a stabilization of the molecular assemblies was reached due to the intermolecular interaction by π–π binding. Here, we show that the atomic structure of the substrate can control the direction of the wires and consequently, complex molecular assemblies can be formed. The electronic decoupling of the molecules by one or two monolayers of KBr from the Cu(111) substrate is found to be insufficient to enable comparable growth conditions to bulk ionic materials.

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“…Evaporating the cyano-porphyrins onto the bulk KBr(001) surface results, as also reported earlier [25–26], in the formation of molecular wires. Fig.…”

Section: Resultssupporting

confidence: 87%

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

Glatzel¹,

Zimmerli²,

Kawai³

et al. 2011

Beilstein J. Nanotechnol.

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“…The measured intermolecular distances of 0.5-0.6 are similar to natural and biomimetic light-harvesting structures and indicate π-π stacking of the porphyrin rings. 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].…”

supporting

confidence: 61%

“…To enhance the molecule-molecule interaction while still shows singlemolecular resolution, while some molecules are already removed from the wire [30] providing a large molecular dipole moment, a special cyanoporphyrin molecule was synthesized and the chemical structure is shown in the inset of Fig. 2a.…”

Section: Deposition Of Porphyrins On Insulating Surfacesmentioning

confidence: 99%

“…The core of the molecule is apolar, while the strong negative polarization of the nitrogen atom induces a dipole moment of 0.36 D allowing to interact with the alternating charges of the ionic surfaces. Porphyrin molecules tend to π-π stack allowing a reasonably strong intermolecular interaction for the stabilization of self-assemblies [30]. Figure 2a shows an nc-AFM image of an electron-irradiated KBr(100) surface [49,50] at a constant frequency shift of Df = −20 Hz, after the evaporation of cyanoporphyrin molecules.…”

Section: Deposition Of Porphyrins On Insulating Surfacesmentioning

confidence: 99%

“…2). The formation, manipulation and even the contacting of such wires by non-contact atomic force microscopy (nc-AFM) at room temperature were studied [11,24,[30][31][32][33]. Finally, even a single truxene molecule could be stabilized at room temperature on a KBr surface at a step edge [34,35].…”

mentioning

confidence: 99%

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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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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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Formation of molecular wires on nanostructured KBr

Cited by 18 publications

References 10 publications

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

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

Mechanical and Electrical Properties of Single Molecules

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

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