Nanoscale Engineering of Molecular Porphyrin Wires on Insulating Surfaces

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

doi:10.1002/smll.200701259

Cited by 79 publications

(90 citation statements)

References 21 publications

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“…These molecular networks, which can be formed through selfassembly processes on a variety of different substrates including semiconductors 5,6 , metals 7,8 , insulators [9][10][11] and layered materials [12][13][14][15] , are, in almost all cases, limited to monolayer thickness. Progress towards the growth of higher layers has so far been much more limited, with demonstrations of bilayer growth 16,17 and site-specific molecular adsorption 5,[18][19][20][21][22][23][24] .…”

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confidence: 99%

Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

et al. 2017

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Two-dimensional supramolecular arrays provide a route to the spatial control of the chemical functionality of a surface, but their deposition is in almost all cases limited to a monolayer termination. Here we investigate the sequential deposition of one 2D array on another to form a supramolecular heterostructure and realise growth, normal to the underlying substrate, of distinct ordered layers, each of which is stabilised by in-plane hydrogen bonding. For heterostructures formed by depositing terephthalic acid (TPA) or trimesic acid (TMA) on cyanuric acid/melamine (CA.M) we determine, using atomic force microscopy under ambient conditions, a clear epitaxial arrangement despite the intrinsically distinct symmetries and/or lattice constants of each layer. Structures calculated using classical molecular dynamics are in excellent agreement with the orientation, registry and dimensions of the epitaxial layers. Calculations confirm that van der Waals interactions provide the dominant contribution to the adsorption energy and registry of the layers.

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confidence: 99%

Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

et al. 2017

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“…The cleaved bulk surfaces often exhibit large and atomically flat terraces bounded by monoatomic step edges. In particular, the geometry and potential variations near step edges play a main role in growth and etching of crystals [11,12], adsorption of molecules [13][14][15] and metallic nanoclusters [16], including the diffusion and pinning dynamics of adsorbates [17,18], and friction [19,20]. It is well known that atomic interaction increases due to the low coordination of the step ions [21], forming an Ehrlich-Schwoebel-like barrier [22].…”

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confidence: 99%

Measuring Electric Field Induced Subpicometer Displacement of Step Edge Ions

et al. 2012

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We provide unambiguous evidence that the applied electrostatic field displaces step atoms of ionic crystal surfaces by subpicometers in different directions via the measurement of the lateral force interactions by bimodal dynamic force microscopy combined with multiscale theoretical simulations. Such a small imbalance in the electrostatic interaction of the shifted anion-cation ions leads to an extraordinary long-range feature potential variation and is now detectable with the extreme sensitivity of the bimodal detection.

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“…Only very recently, direct-space imaging of molecular self-assembly has been extended to dielectric substrates using noncontact atomic force microscopy ͑NC-AFM͒. [8][9][10][11][12][13][14][15][16][17][18][19][20][21] So far, however, controlled structure formation has been hindered by weak and unspecific molecule-substrate interactions, frequently leading to clustering and bulk crystal formation of the molecules at step edges 15 or aggregation into structures of several nanometers in width. 16,17 Recently, cleavage step edges and patterning by electron irradiation on KBr͑001͒ ͑Ref.…”

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Cooperative mechanism for anchoring highly polar molecules at an ionic surface

et al. 2009

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Structure formation of the highly polar molecule cytosine on the ͑111͒ cleavage plane of calcium fluoride is investigated in ultrahigh vacuum using noncontact atomic force microscopy at room temperature. Molecules form well-defined trimer structures, covering the surface as homogeneously distributed stable structures. Density-functional theory calculations yield a diffusion barrier of about 0.5 eV for individual molecules suggesting that they are mobile at room temperature. Furthermore, it is predicted that the molecules can form trimers in a configuration allowing all molecules to attain their optimum adsorption position on the substrate. As the trimer geometry facilitates hydrogen bonding between the molecules within the trimer, we conclude that the stabilization of individual diffusing molecules into stable trimers is due to a cooperative mechanism involving polar interactions between molecules and substrate as well as hydrogen bonding between molecules.

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Nanoscale Engineering of Molecular Porphyrin Wires on Insulating Surfaces

Cited by 79 publications

References 21 publications

Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

Measuring Electric Field Induced Subpicometer Displacement of Step Edge Ions

Cooperative mechanism for anchoring highly polar molecules at an ionic surface

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