Properties of large organic molecules on metal surfaces

Rosei, Federico; Schunack, Michael; Naitoh, Yoshitaka; Jiang, Ping; Gourdon, André; Lægsgaard, Erik; Stensgaard, I.; Joachim, Christian; Besenbacher, Flemming

doi:10.1016/s0079-6816(03)00004-2

Cited by 453 publications

(375 citation statements)

References 115 publications

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“…11 Both types of molecules are available in many different modifications. Various experiments involving those molecules were performed, e.g., the self-assembly on metallic surfaces 12,13 or the development of functional single molecule devices such as rotors [14][15][16][17] or switches 18,19 was studied.…”

Section: Introductionmentioning

confidence: 99%

Communication: Substrate induced dehydrogenation: Transformation of octa-ethyl-porphyrin into tetra-benzo-porphyrin

Vörden

Lange

Schmuck

et al. 2013

The Journal of Chemical Physics

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Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of 47048 Duisburg, Germany (Received 27 March 2013; accepted 29 May 2013; published online 7 June 2013) Individual molecules of octa-ethyl-porhphyrin-iron(III)-chloride adsorbed on a Cu(111) surface are studied by scanning tunneling microscopy. Upon moderate heating the molecules are found to transform into Fe-tetra-benzo-porphyrin at a surprisingly low temperature of 380 K. If the annealing is interrupted, the different steps of the transformation can be imaged. By evaluating the ratio of transformed molecules as function of annealing temperature, an approximate activation energy of 1.2 eV ± 0.1 eV could be determined. © 2013 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Communication: Substrate induced dehydrogenation: Transformation of octa-ethyl-porphyrin into tetra-benzo-porphyrin

Vörden

Lange

Schmuck

et al. 2013

The Journal of Chemical Physics

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“…Provided this binding energy is much larger than the thermal energy, the molecule will stay adsorbed on the solid surface. Under no external field, the adsorbate performs a random walk on the surface, as observed by using the field-ion microscope (1) and the scanning tunneling microscope (2,3). The motion is thermally activated, its rate depending on the ratio of the migration barrier energy to the thermal energy.…”

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confidence: 99%

“…The probe tips have also been used to push molecules on solid surfaces (3,8). The distinction between pushing and electric field-induced motion may be blurred at the nanometer scale, but does have a significant consequence.…”

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confidence: 99%

Programmable motion and patterning of molecules on solid surfaces

Suo

Hong²

2004

Proc. Natl. Acad. Sci. U.S.A.

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Adsorbed on a solid surface, a molecule can migrate and carry an electric dipole moment. A nonuniform electric field can direct the motion of the molecule. A collection of the same molecules may aggregate into a monolayer island on the solid surface. Place such molecules on a dielectric substrate surface, beneath which an array of electrodes is buried. By varying the voltages of the electrodes individually, it is possible to program molecular patterning, direct an island to move in a desired trajectory, or merge several islands into a larger one. The dexterity may lead to new technologies, such as reconfigurable molecular patterning and programmable molecular cars. This paper develops a phase field model to simulate the molecular motion and patterning under the combined actions of dipole moments, intermolecular forces, entropy, and electrodes.self-assembly ͉ diffusion ͉ adsorbate ͉ electric dipole W hen a molecule from vacuum adsorbs on a solid surface, the total energy of the molecule and the solid reduces by an amount. Provided this binding energy is much larger than the thermal energy, the molecule will stay adsorbed on the solid surface. Under no external field, the adsorbate performs a random walk on the surface, as observed by using the field-ion microscope (1) and the scanning tunneling microscope (2, 3). The motion is thermally activated, its rate depending on the ratio of the migration barrier energy to the thermal energy.The adsorbate carries an electric dipole moment. Even if the molecule is symmetric and nonpolar when isolated in vacuum, the act of binding to a substrate breaks the symmetry. The resulting asymmetric charge distribution gives rise to an electric dipole moment. (The clean solid surface itself has an asymmetric charge distribution. What concerns us is the excess dipole moment induced by the adsorbate.)

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“…the number of molecules moving per second -similar to diffusion studies for non-motorized molecules, 15,30,31 from:…”

Section: Resultsmentioning

confidence: 99%

Light-Induced Translation of Motorized Molecules on a Surface

et al. 2016

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Molecular machines are a key component in the vision of molecular nanotechnology, and have the potential to transport molecular species and cargo on surfaces. The motion of such machines should be triggered remotely, ultimately allowing a large number of molecules to be propelled by a single source, with light being an attractive stimulus. Here, we report upon the photo-induced translation of molecular machines across a surface by characterizing single molecules before and after illumination. Illumination of molecules containing a motor unit results in an enhancement in the diffusion of the molecules. The effect vanishes if an incompatible photon energy is used or if the motor unit is removed from the molecule, revealing that the enhanced motion is due to the presence of the wavelength-sensitive motor in each molecule.Molecular machines with internal motors are fascinating objects that transform energy into useful motion at the nanoscale. [1][2][3][4][5][6] In nature many processes depend on molecular motors that perform specific mechanical tasks in living cells, 7 a prototypical process is the directional motion of myosin. 8 Several synthetic molecular motors have been synthesized, 2,9,10 including a molecular motor developed by Feringa and co-workers that rotates at a frequency in the MHz regime. [11][12][13][14] For ultimate control of molecular machines it is essential that the motor exhibits only one sense of rotation, resulting in unidirectional translation of the molecular machine on a surface, thus only forward and no backward motion, in contrast to random motion in all directions. 2 For synthetic molecular machines to contribute to the vision of nanotechnology by transporting molecular species and cargo on surfaces, the motion of

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Properties of large organic molecules on metal surfaces

Cited by 453 publications

References 115 publications

Communication: Substrate induced dehydrogenation: Transformation of octa-ethyl-porphyrin into tetra-benzo-porphyrin

Communication: Substrate induced dehydrogenation: Transformation of octa-ethyl-porphyrin into tetra-benzo-porphyrin

Programmable motion and patterning of molecules on solid surfaces

Light-Induced Translation of Motorized Molecules on a Surface

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