Electron Transport in Single Molecular Wires

by Sander J. Tans

Publisher: Delft Univ Pr

Written in English
Published: Pages: 118 Downloads: 813
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  • Science/Mathematics
The Physical Object
Number of Pages118
ID Numbers
Open LibraryOL12803556M
ISBN 109040716544
ISBN 109789040716546

  Electron transfer is one of the key reactions of biology not just in catalysis of oxidation/reduction reactions but in the conversion of sources of energy such as light to usable form for chemical transformations. There are then two intriguing problems. What is the nature of the matrix in which electrons flow in a biological cell after the initial charge separation due for example to the. Molecular wires are key elements in nanoelectronics, in particular in single-molecule circuitry where the wires are responsible for electronic communication between various functional elements1, important criteria for an optimal molecular wire are efficient charge transport, high chemical stability and a high conformational flexibility to adapt to different contact geometries. Molecular wires 1,2, which are composed of a molecular chain promoting the electronic communication between the two groups attached to terminals of the chain, have been extensively investigated 3,4,5,6,7,8,9,10,11 due to their promising applications including photosys13,14,15 and molecular electronHowever, a major challenge is to find appropriate molecules that display. Single-molecule conductance measurements and transport calculations based on density functional theory show that the conductance of a double-backbone molecular junction can be more than twice that.

  The molecular wires, composed of a series of organic molecules, are sanwiched between two gold electrodes to make a two terminal device. The length of the wire is increased by sequentially increasing the number of molecules in the wire from 1 to 3. In the low bias regime all the molecular devices are found to exhibit Ohmic behavior. Optically monitoring voltage in neurons by photo-induced electron transfer through molecular wires Proc Natl Acad Sci U S A. Feb 7;(6) doi: /pnas T1 - Electron transport in molecular junctions. AU - Tao, Nongjian. PY - /1/1. Y1 - /1/1. N2 - Building an electronic device using individual molecules is one of the ultimate goals in nanotechnology. To achieve this it will be necessary to measure, control and understand electron transport through molecules attached to electrodes. An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Landauer Theory, Inelastic Scattering and Electron Transport in Molecular Wires Item Preview remove-circle.

Abstract. We consider electrical transport properties of a molecular wire under the influence of time-dependent electromagnetic fields. A formalism based on Floquet theory is derived which allows to calculate both the dc current through the molecular wire and the associated noise power. Electron transfer (ET) is an elementary step in many chemical reactions and biological processes. Measuring ET at the single-molecule level opens new prospects for studying individual reaction steps and heterogeneity in ET. Despite recent advances, the connection between the single-molecule behavior and the ensemble averages remains unclear. By performing direct electrical measurements on.   In he spent his sabbatical with the Quantronics group at the CEA in Saclay, France. He pioneered the break junction technique for atomic and molecular wires. His current research interests are in the field of low-temperature experimental physics with a focus on electron transport in .

Electron Transport in Single Molecular Wires by Sander J. Tans Download PDF EPUB FB2

Electron transport through single molecular wires functional theory code SIESTA [7], combined with a super cell approach.

We use the local density approximation as parameterised by Perdue and Zinger [8], non-local norm-conserving pseudopotentials [9], and valence electrons described by a single. Electron transport through single molecular wires.

Grace, I. and Bailey, S. and Jefferson, J. and Lambert, C. () Electron transport through single molecular wires. Materials Science, 22 (4). ISSN Full text not available from this repository. Cited by: 3. As functional elements in opto-electronic devices approach the singlemolecule limit, conducting organic molecular wires are the appropriate interconnects that enable transport of charges and charge-like particles such as excitons within the device.

Reproducible syntheses and a thorough understanding of the underlying principles are therefore indispensable for applications like even smaller.

Electron Transport in Molecular Wire Junctions Abraham Nitzan1 and Mark A. Ratner2 Molecular conductance junctions are structures in which single molecules or small groups of molecules conduct electrical current between two electrodes.

In such junc-tions, the connection between the molecule and the electrodes greatly affects the. Electron transport is most efficient when the electron transmission probability via a molecule reaches %; the corresponding conductance is then 2e2/h (e is the charge of the electron and h is the Planck constant).

This ideal conduction has been observed in a single metal atom and a string of metal atoms connected between two by:   The two simplest molecular transport junctions are wires made of either one single atom or a row of metal atoms.

Quantized conductance was observed on disordered metallic wires in ionic solution (Fig. 2) (17) (that is, the conductance exhibited steps near 4, 3, 2, 1, or 0 quantum units). It was found that the intermolecular distance between single molecular units, the number of molecules connected in parallel as v as the interaction strength plays an important role for controlling the transport of electrons in molecule wire.

1) The HOMO-LUMO gap (HLG) of one single SAM unit is reduces when increasing N or decreasing d. 2) The (HLG) is a critical parameter for the molecular. We have determined the conductance of Electron Transport in Single Molecular Wires book ferrocene molecules with carboxylic acid anchoring groups using the STM break junction technique, and three sets of conductance values were found, i.e.

high conductance (HC), medium conductance (MC) and low conductance (LC) values. The enhancing effect of the incorporated ferrocene on the electron transport in saturated alkane molecular wires. 2 1 Introduction: Molecular Electronics and Molecular Wires bonded between two Au electrodes by the group of Reed et al.[4]andthe experimental demonstration of single-molecule rectification in an Aviram–Ratner type molecule by Metzger and coworkers [5].

The modulation of electron transport through molecular junctions is a prerequisite for realizing single-molecule electronic devices, which remains to be a big challenge. In this work, an effective strategy using heteroatom substitution in the molecular backbone is carried out to tune the conductance of molecular.

and meta-linked bridged biphenyl units in single molecular conductance measurements. Scientific Reports, 7. 3- Modelling crown Ether molecular wires from experiment (to be submitted) 4- Carbon Nanotube based single molecule devices (to be submitted) 5- A comprehensive study of the electrical conductivity through flat stacked.

Nitzan, A. & Ratner, M. Electron transport in molecular wire junctions. Science– (). formed single molecular wires that extended from the Au{} substrate to about. We have studied electron transport through single redox molecules, perylene tetracarboxylic diimides, covalently bound to two gold electrodes via different linker groups, as a function of electrochemical gate voltage and temperature in different solvents.

The conductance of these molecules is sensitive to the linker groups because of different electronic coupling strengths between the.

Figure \(\PageIndex{1}\): The electron transport chain: The electron transport chain is a series of electron transporters embedded in the inner mitochondrial membrane that shuttles electrons from NADH and FADH 2 to molecular oxygen.

In the process, protons are pumped from the mitochondrial matrix to the intermembrane space, and oxygen is. Molecular Wire. Molecular wires produced in this way by mimicking nature’s nanowires (Leys and Scrutton, ), have been investigated using a porphyrin-binding protein on an amyloid scaffold composed of two covalently fused proteins with differing propensities to aggregate (Baldwin et al., ).

single electron tunneling many-body state (Kondo effect) Measurement Bias voltage at T = mK V Coulomb blockade Electron transport governed by: tunneling processes - discrete electron charge - orbitals of the molecule - electron-electron interactions and many-body effects.

Electrochemical gate-controlled electron transport of redox-active single perylene bisimide molecular junctions. C Li 1,2, A Mishchenko 1, Z Li 1, I Pobelov 1,2, Th Wandlowski 1,2, X Q Li 3, F Würthner 3, A Bagrets 4,5 and F Evers 4,5.

Published 26 August • IOP Publishing Ltd Journal of Physics: Condensed Matter, Vol Number In this article, we have investigated the influence of the nitro side-group on the single molecular conductance of pyridine-based molecules by scanning tunneling microscopy break junction.

Single molecular conductance of 4,4′-bipyridine (BPY), 3-nitro(pyridinyl)pyridine (BPY-N), and 3-nitro(3-nitropyridinyl)pyridine (BPY-2N) were measured by contact with Au electrodes. T1 - Electron transport in molecular wire junctions. AU - Nitzan, Abraham. AU - Ratner, Mark A. PY - /5/ Y1 - /5/ N2 - Molecular conductance junctions are structures in which single molecules or small groups of molecules conduct electrical current between two electrodes.

Similarly, Mirkin and Ratner have demonstrated electronic molecular wires that can transfer holes or electrons across active sites. It has been established, that the charge transfer that takes place across a molecular wire is the result of intramolecular electron transfer across the sites through the linking molecule.

The possibility of controlling electron transport in a single molecular junction represents the ultimate goal of molecular electronics. Here, we report that the modification of bridging group makes it possible to improve the performance and obtain new functions in a single cross-conjugated molecular junction, designed from a recently synthesized bipolar molecule bithiophene naphthalene diimide.

Electron transport through single molecular wires () Pagina-navigatie: Main; Save publication. Save as MODS; Export to Mendeley; Save as EndNote. probe electron transport through single conductive molecules (or molecular wires), such as electrode-molecule-electrode hetero-junctions, using, e.g., mechanical break junctions, 1 electro-migrated break junctions, 2 scanning nanoprobe microscopes 3,4 and.

We present low-temperature electron transport measurements of individual phenylene–ethynylene molecular wires, connected to nanometer-spaced gold electrodes.

Low-bias current–voltage (I – V) characteristics measured at K are stable and show irregular steps. The effect of CO adsorption on the electron transport behavior of single Fe-porphyrin molecular wire with sulfur end groups bonded to two gold (1 1 1) electrodes is investigated using nonequilibrium Green's function formalism combined with first-principles density functional theory.

The current-voltage characteristics of the single Fe-porphyrin molecular wires with and without CO adsorption. To date, single electron transport behavior has been observed from many different nanostructures.

They include metallic nanoparticles[27], semiconductor heterostructures [28, 29], carbon nanotubes[30, 31] and semiconducting nanocrystals[8]. More recently, similar behaviors were observed from devices made from single molecules[]. How a single molecule or an ordered network of molecules (1–7) can perform transport (8, 9) or a computation using mechanical (), magnetic (), or electronic degrees of freedom is becoming an active field of research, after the first suggestive ideas of the s (13, 14).Use of electronic and nuclear molecular degrees of freedom to create a device function embedded inside a unique molecule.

Measurement of voltage-dependent electronic transport across amine-linked single-molecular-wire junctions. J R Widawsky 1,2, M Kamenetska 1,2, J Klare 2,3, C Nuckolls 2,3, M L Steigerwald 3, M S Hybertsen 4 and L Venkataraman 1,2.

Published 2 October • IOP Publishing Ltd Nanotechnology, Vol Number We report a first-principles study of quantum transport in a prototype two-terminal device consisting of a molecular nanowire acting as an inter-connect between two gold electrodes.

The wire is composed of a series of bicyclo[]pentane (BCP) cage-units. The length of the wire (L) is increased by sequentially increasing the number of BCP cage units in the wire from 1 to 3. Using a first principles approach, we study the electron transport properties of two molecules of length $\phantom{\rule{em}{0ex}}\mathrm{nm}$, which are the building blocks for a new class of molecular wires containing fluorenone units.

We show that the presence of side groups attached to these units leads to Fano resonances close to the Fermi energy. (2) V d is slowed down to pm/s just before the transition from ballistic to tunneling electron transport occurs, whereat the electrical conductance through a monovalent metal contact reaches a level around conductance quantum G 0 = 2 e 2 /h, where e is the charge on an electron and h is Planck constant.

At this point, the Au contact was. In molecular electronics individual molecules serve as electronic devices. In these systems, electron–vibron (e–ν) coupling can be expected to lead .Inelastic electron tunneling spectroscopy in molecular junctions: Peaks and dips. J. Chem. Phys.() D. Segal, A.

Nitzan and P. Hänggi. Thermal conductance through molecular wires. J. Chem. Phys.() A. Nitzan and Mark Ratner. Electron transport in molecular wire junctions: Models and Mechanisms.