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Ornago L, Zwick P, van der Poel S, Brandl T, El Abbassi M, Perrin ML, Dulić D, van der Zant HSJ, Mayor M. Influence of Peripheral Alkyl Groups on Junction Configurations in Single-Molecule Electronics. J Phys Chem C Nanomater Interfaces 2024; 128:1413-1422. [PMID: 38293692 PMCID: PMC10823531 DOI: 10.1021/acs.jpcc.3c06970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 12/28/2023] [Accepted: 12/28/2023] [Indexed: 02/01/2024]
Abstract
The addition of a lateral alkyl chain is a well-known strategy to reduce π-stacked ensembles of molecules in solution, with the intention to minimize the interactions between the molecules' backbones. In this paper, we study whether this concept generalizes to single-molecule junctions by using a combination of mechanically controllable break junction (MCBJ) measurements and clustering-based data analysis with two small series of model compounds decorated with various bulky groups. The systematic study suggests that introducing alkyl side chains also favors the formation of electrode-molecule configurations that are not observed in their absence, thereby inducing broadening of the conductance peak in the one-dimensional histograms. Thus, the introduction of alkyl chains in aromatic compounds for molecular electronics must be carefully designed and optimized for the specific purpose, balancing between increased solubility and the possibility of additional junction configurations.
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Affiliation(s)
- Luca Ornago
- Kavli
Institute of Nanoscience, Delft University
of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Patrick Zwick
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Sebastiaan van der Poel
- Kavli
Institute of Nanoscience, Delft University
of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Thomas Brandl
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Maria El Abbassi
- Kavli
Institute of Nanoscience, Delft University
of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Mickael L. Perrin
- Transport
at Nanoscale Interfaces Laboratory, Empa,
Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
- Department
of Information Technology and Electrical Engineering, ETH Zürich, 8092 Zürich, Switzerland
- Quantum
Center, ETH Zürich, 8093 Zürich, Switzerland
| | - Diana Dulić
- Department
of Physics and Department of Electrical Engineering, Faculty of Physical
and Mathematical Sciences, University of
Chile, Avenida Blanco
Encalada 2008, Santiago 8330015, Chile
| | - Herre S. J. van der Zant
- Kavli
Institute of Nanoscience, Delft University
of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Marcel Mayor
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
- Institute
for Nanotechnology (INT), Karlsruhe Institute
of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
- Lehn
Institute of Functional Materials (LIFM), School of Chemistry, Sun Yat-Sen University (SYSU), Guangzhou 510275, China
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2
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Schosser WM, Hsu C, Zwick P, Beltako K, Dulić D, Mayor M, van der Zant HSJ, Pauly F. Mechanical conductance tunability of a porphyrin-cyclophane single-molecule junction. Nanoscale 2022; 14:984-992. [PMID: 34989747 PMCID: PMC8772887 DOI: 10.1039/d1nr06484c] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The possibility to study quantum interference phenomena at ambient conditions is an appealing feature of molecular electronics. By connecting two porphyrins in a cofacial cyclophane, we create an attractive platform for mechanically controlling electric transport through the intramolecular extent of π-orbital overlap of the porphyrins facing each other and through the angle of xanthene bridges with regard to the porphyrin planes. We analyze theoretically the evolution of molecular configurations in the pulling process and the corresponding changes in electric conduction by combining density functional theory (DFT) with Landauer scattering theory of phase-coherent elastic transport. Predicted conductances during the stretching process show order of magnitude variations caused by two robust destructive quantum interference features that span through the whole electronic gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Mechanically-controlled break junction (MCBJ) experiments at room temperature verify the mechanosensitive response of the molecular junctions. During the continuous stretching of the molecule, they show conductance variations of up to 1.5 orders of magnitude over single breaking events. Uncommon triple- and quadruple-frequency responses are observed in periodic electrode modulation experiments with amplitudes of up to 10 Å. This further confirms the theoretically predicted double transmission dips caused by the spatial and energetic rearrangement of molecular orbitals, with contributions from both through-space and through-bond transport.
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Affiliation(s)
- Werner M Schosser
- Institute of Physics, University of Augsburg, 86135 Augsburg, Germany.
| | - Chunwei Hsu
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands.
| | - Patrick Zwick
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.
| | - Katawoura Beltako
- Institute of Physics, University of Augsburg, 86135 Augsburg, Germany.
| | - Diana Dulić
- Department of Physics, Department of Electrical Engineering, Faculty of Physical and Mathematical Sciences, University of Chile, Avenida Blanco Encalada 2008, Santiago 8330015, Chile
| | - Marcel Mayor
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany
- Lehn Institute of Functional Materials (LIFM), School of Chemistry, Sun Yat-Sen University (SYSU), 510275 Guangzhou, China
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands.
| | - Fabian Pauly
- Institute of Physics, University of Augsburg, 86135 Augsburg, Germany.
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3
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Hsu C, Schosser WM, Zwick P, Dulić D, Mayor M, Pauly F, van der Zant HSJ. Mechanical compression in cofacial porphyrin cyclophane pincers. Chem Sci 2022; 13:8017-8024. [PMID: 35919422 PMCID: PMC9278344 DOI: 10.1039/d2sc00937d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 06/12/2022] [Indexed: 11/21/2022] Open
Abstract
Intra- and intermolecular interactions are dominating chemical processes, and their concerted interplay enables complex nonequilibrium states like life. While the responsible basic forces are typically investigated spectroscopically, a conductance measurement to probe and control these interactions in a single molecule far out of equilibrium is reported here. Specifically, by separating macroscopic metal electrodes, two π-conjugated, bridge-connected porphyrin decks are peeled off on one side, but compressed on the other side due to the covalent mechanical fixation. We observe that the conductance response shows an exceptional exponential rise by two orders of magnitude in individual breaking events during the stretching. Theoretical studies atomistically explain the measured conductance behavior by a mechanically activated increase in through-bond transport and a simultaneous strengthening of through-space coupling. Our results not only reveal the various interacting intramolecular transport channels in a molecular set of levers, but also the molecules' potential to serve as molecular electro-mechanical sensors and switches. A two-order conductance increase upon stretching in porphyrin cyclophane pincer junctions is measured. Atomistic studies explain experimental observations by characteristic intramolecular changes in through-space and through-bond transport.![]()
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Affiliation(s)
- Chunwei Hsu
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
| | | | - Patrick Zwick
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Diana Dulić
- Department of Physics, Department of Electrical Engineering, Faculty of Physical and Mathematical Sciences, University of Chile, Avenida Blanco Encalada 2008, Santiago 8330015, Chile
| | - Marcel Mayor
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany
- Lehn Institute of Functional Materials (LIFM), School of Chemistry, Sun Yat-Sen University (SYSU), 510275 Guangzhou, China
| | - Fabian Pauly
- Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
| | - Herre S. J. van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
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4
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Zwick P, Dulić D, van der Zant HSJ, Mayor M. Porphyrins as building blocks for single-molecule devices. Nanoscale 2021; 13:15500-15525. [PMID: 34558586 PMCID: PMC8485416 DOI: 10.1039/d1nr04523g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/19/2021] [Indexed: 05/23/2023]
Abstract
Direct measurement of single-molecule electrical transparency by break junction experiments has become a major field of research over the two last decades. This review specifically and comprehensively highlights the use of porphyrins as molecular components and discusses their potential use for the construction of future devices. Throughout the review, the features provided by porphyrins, such as low level misalignments and very low attenuation factors, are shown with numerous examples, illustrating the potential and limitations of these molecular junctions, as well as differences emerging from applied integration/investigation techniques.
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Affiliation(s)
- Patrick Zwick
- Department of Chemistry, University of Basel, St Johanns-Ring 19, 4056 Basel, Switzerland.
| | - Diana Dulić
- Department of Physics and Department of Electrical Engineering, Faculty of Physical and Mathematical Sciences, University of Chile, Avenida Blanco Encalada 2008, Santiago 8330015, Chile
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Marcel Mayor
- Department of Chemistry, University of Basel, St Johanns-Ring 19, 4056 Basel, Switzerland.
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany
- Lehn Institute of Functional Materials (LIFM), School of Chemistry, Sun Yat-Sen University (SYSU), 510275 Guangzhou, China
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5
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Zwick P, Hsu C, El Abbassi M, Fuhr O, Fenske D, Dulić D, van der Zant HSJ, Mayor M. Synthesis and Transport Studies of a Cofacial Porphyrin Cyclophane. J Org Chem 2020; 85:15072-15081. [PMID: 33166468 DOI: 10.1021/acs.joc.0c01957] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Porphyrin cyclophane 1, consisting of two rigidly fixed but still movable cofacial porphyrins and exposing acetate-masked thiols in opposed directions of the macrocycle, is designed, synthesized, and characterized. The functional cyclophane 1, as pioneer of mechanosensitive 3D materials, forms stable single-molecule junctions in a mechanically controlled break-junction setup. Its reliable integration in a single-molecule junction is a fundamental prerequisite to explore the potential of these structures as mechanically triggered functional units and devices.
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Affiliation(s)
- Patrick Zwick
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Chunwei Hsu
- Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
| | - Maria El Abbassi
- Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
| | - Olaf Fuhr
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany.,Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Dieter Fenske
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany.,Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Diana Dulić
- Department of Physics and Department of Electrical Engineering, Faculty of Physical and Mathematical Sciences, University of Chile, Avenida Blanco Encalada 2008, 8330015 Santiago, Chile
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
| | - Marcel Mayor
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.,Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany.,Lehn Institute of Functional Materials (LIFM), School of Chemistry, Sun Yat-Sen University (SYSU), 510275 Guangzhou, China
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6
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Zwick P, Weiland KJ, Malinčík J, Stefani D, Häussinger D, van der Zant HSJ, Dulić D, Mayor M. Mechanical Fixation by Porphyrin Connection: Synthesis and Transport Studies of a Bicyclic Dimer. J Org Chem 2019; 85:118-128. [DOI: 10.1021/acs.joc.9b02327] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patrick Zwick
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Kevin J. Weiland
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Juraj Malinčík
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Davide Stefani
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Daniel Häussinger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Herre S. J. van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Diana Dulić
- Department of Physics and Department of Electrical Engineering, Faculty of Physicaland Mathematical Sciences, University of Chile, Avenida Blanco Encalada 2008, Santiago 8330015, Chile
| | - Marcel Mayor
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
- Lehn Institute of Functional Materials (LIFM), School of Chemistry, Sun Yat-Sen University (SYSU), 510275 Guangzhou, China
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7
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El Abbassi M, Zwick P, Rates A, Stefani D, Prescimone A, Mayor M, van der Zant HSJ, Dulić D. Unravelling the conductance path through single-porphyrin junctions. Chem Sci 2019; 10:8299-8305. [PMID: 31803408 PMCID: PMC6853084 DOI: 10.1039/c9sc02497b] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 07/30/2019] [Indexed: 01/29/2023] Open
Abstract
By studying transport through seven structurally related porphyrin derivatives with a machine learning algorithm we could identify and distinguish three different electronic paths.
Porphyrin derivatives are key components in natural machinery enabling us to store sunlight as chemical energy. In spite of their prominent role in cascades separating electrical charges and their potential as sensitizers in molecular devices, reports concerning their electronic transport characteristics are inconsistent. Here we report a systematic investigation of electronic transport paths through single porphyrin junctions. The transport through seven structurally related porphyrin derivatives was repeatedly measured in an automatized mechanically controlled break-junction set-up and the recorded data were analyzed by an unsupervised clustering algorithm. The correlation between the appearances of similar clusters in particular sub-sets of the porphyrins with a common structural motif allowed us to assign the corresponding current path. The small series of model porphyrins allowed us to identify and distinguish three different electronic paths covering more than four orders of magnitude in conductance.
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Affiliation(s)
- Maria El Abbassi
- Kavli Institute of Nanoscience , Delft University of Technology , 2600 GA Delft , The Netherlands .
| | - Patrick Zwick
- Department of Chemistry , University of Basel , CH-4056 Basel , Switzerland .
| | - Alfredo Rates
- Kavli Institute of Nanoscience , Delft University of Technology , 2600 GA Delft , The Netherlands . .,Department of Physics , Department of Electrical Engineering , Faculty of Physical and Mathematical Sciences , University of Chile , Avenida Blanco Encalada 2008 , Santiago 8330015 , Chile .
| | - Davide Stefani
- Kavli Institute of Nanoscience , Delft University of Technology , 2600 GA Delft , The Netherlands .
| | | | - Marcel Mayor
- Department of Chemistry , University of Basel , CH-4056 Basel , Switzerland . .,Institute of Nanotechnology (INT) , Karlsruhe Institute of Technology (KIT) , D-76021 Karlsruhe , Germany.,Lehn Institute of Functional Materials (LIFM) , School of Chemistry , Sun Yat-Sen University (SYSU) , Guangzhou 510275 , China
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience , Delft University of Technology , 2600 GA Delft , The Netherlands .
| | - Diana Dulić
- Department of Physics , Department of Electrical Engineering , Faculty of Physical and Mathematical Sciences , University of Chile , Avenida Blanco Encalada 2008 , Santiago 8330015 , Chile .
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8
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Olavarría-Contreras IJ, Etcheverry-Berríos A, Qian W, Gutiérrez-Cerón C, Campos-Olguín A, Sañudo EC, Dulić D, Ruiz E, Aliaga-Alcalde N, Soler M, van der Zant HSJ. Electric-field induced bistability in single-molecule conductance measurements for boron coordinated curcuminoid compounds. Chem Sci 2018; 9:6988-6996. [PMID: 30210774 PMCID: PMC6124902 DOI: 10.1039/c8sc02337a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 07/20/2018] [Indexed: 11/21/2022] Open
Abstract
We have studied the single-molecule conductance of a family of curcuminoid molecules (CCMs) using the mechanically controlled break junction (MCBJ) technique. The CCMs under study contain methylthio (MeS-) as anchoring groups: MeS-CCM (1), the free-ligand organic molecule, and two coordination compounds, MeS-CCM-BF2 (2) and MeS-CCM-Cu (3), where ligand 1 coordinates to a boron center (BF2 group) and to a CuII moiety, respectively. We found that the three molecules present stable molecular junctions allowing detailed statistical analysis of their electronic properties. Compound 3 shows a slight increase in the conductance with respect to free ligand 1, whereas incorporation of BF2 (compound 2) promotes the presence of two conductance states in the measurements. Additional experiments with control molecules point out that this bistability is related to the combination of MeS- anchoring groups and the BF2 moiety within the structure of the molecules. Theoretical calculations show that this can be explained by the presence of two conformers once compound 2 is anchored between the gold electrodes. An energy minimum is found for a flat structure but there is a dramatic change in the magnitude and orientation of dipole moment (favouring a non-flat conformer in the presence of an external electric field) due to a conformational change of one of the terminal MeS- groups. The results thus point to an intricate interplay between the applied bias voltage and the molecule dipole moment which could be the basis for designing new molecules aiming at controlling their conformation in devices.
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Affiliation(s)
| | - Alvaro Etcheverry-Berríos
- Departamento de Ingeniería Química , Biotecnología y Materiales , Facultad de Ciencias Físicas y Matemáticas , Universidad de Chile , Beauchef 851 , Santiago , Chile .
| | - Wenjie Qian
- ICMAB-CSIC (Institut de Ciència dels Materials de Barcelona) , Campus de la Universitat Autònoma de Barcelona , 08193 Bellaterra , Spain .
| | - Cristian Gutiérrez-Cerón
- Departamento de Física , Facultad de Ciencias Físicas y Matemáticas , Universidad de Chile , Av. Blanco Encalada 2008 , Santiago , Chile
| | - Aldo Campos-Olguín
- Departamento de Ingeniería Química , Biotecnología y Materiales , Facultad de Ciencias Físicas y Matemáticas , Universidad de Chile , Beauchef 851 , Santiago , Chile .
| | - E Carolina Sañudo
- Departament de Química Inorgànica i Orgànica , Universitat de Barcelona , Diagonal 645 , 08028 , Barcelona , Spain
- Institut de Nanociència i Nanotecnologia , Universitat de Barcelona , Diagonal 645 , 08028 , Barcelona , Spain
| | - Diana Dulić
- Departamento de Física , Facultad de Ciencias Físicas y Matemáticas , Universidad de Chile , Av. Blanco Encalada 2008 , Santiago , Chile
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica , Universitat de Barcelona , Diagonal 645 , 08028 , Barcelona , Spain
- Institut de Química Teòrica i Computacional , Universitat de Barcelona , Diagonal 645 , E-08028 Barcelona , Spain
| | - Núria Aliaga-Alcalde
- ICMAB-CSIC (Institut de Ciència dels Materials de Barcelona) , Campus de la Universitat Autònoma de Barcelona , 08193 Bellaterra , Spain .
- ICREA (Institució Catalana de Recerca i Estudis Avançats) , Passeig Lluís Companys, 23 , 08018 Barcelona , Spain
| | - Monica Soler
- Departamento de Ingeniería Química , Biotecnología y Materiales , Facultad de Ciencias Físicas y Matemáticas , Universidad de Chile , Beauchef 851 , Santiago , Chile .
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience , Delft University of Technology , Lorentzweg 1 , Delft 2628 CJ , The Netherlands .
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9
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Stefani D, Perrin M, Gutiérrez‐Cerón C, Aragonès AC, Labra‐Muñoz J, Carrasco RDC, Matsushita Y, Futera Z, Labuta J, Ngo TH, Ariga K, Díez‐Pérez I, van der Zant HSJ, Dulić D, Hill JP. Mechanical Tuning of Through‐Molecule Conductance in a Conjugated Calix[4]pyrrole. ChemistrySelect 2018. [DOI: 10.1002/slct.201801076] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Davide Stefani
- Kavli Institute of NanoscienceDelft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands
| | - Mickael Perrin
- Kavli Institute of NanoscienceDelft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands
| | - Cristian Gutiérrez‐Cerón
- Physics DepartmentFaculty of Physical and Mathematical SciencesUniversity of Chile, Av. Blanco Encalada 2008 Santiago Chile
| | - Albert C. Aragonès
- Department of ChemistryFaculty of Natural & Mathematical SciencesKing's College London, Brittania House, 7 Trinity Street London SE1 1DB United Kingdom
| | - Jacqueline Labra‐Muñoz
- Physics DepartmentFaculty of Physical and Mathematical SciencesUniversity of Chile, Av. Blanco Encalada 2008 Santiago Chile
| | - Rodrigo D. C. Carrasco
- Physics DepartmentFaculty of Physical and Mathematical SciencesUniversity of Chile, Av. Blanco Encalada 2008 Santiago Chile
| | - Yoshitaka Matsushita
- Research Network and Facilities DivisionNational Institute for Materials Science, Sengen 1-2-1, Tsukuba Ibaraki 305-0047 Japan
| | - Zdenek Futera
- School of Chemical & Bioprocess EngineeringUniversity College Dublin, Belfield Dublin 4 Ireland
| | - Jan Labuta
- WPI Center for Materials NanoarchitectonicsNational Institute for Materials Science, Namiki 1–1, Tsukuba Ibaraki 305-0044 Japan
| | - Thien H. Ngo
- WPI Center for Materials NanoarchitectonicsNational Institute for Materials Science, Namiki 1–1, Tsukuba Ibaraki 305-0044 Japan
| | - Katsuhiko Ariga
- WPI Center for Materials NanoarchitectonicsNational Institute for Materials Science, Namiki 1–1, Tsukuba Ibaraki 305-0044 Japan
| | - Ismael Díez‐Pérez
- Department of ChemistryFaculty of Natural & Mathematical SciencesKing's College London, Brittania House, 7 Trinity Street London SE1 1DB United Kingdom
| | - Herre S. J. van der Zant
- Kavli Institute of NanoscienceDelft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands
| | - Diana Dulić
- Physics DepartmentFaculty of Physical and Mathematical SciencesUniversity of Chile, Av. Blanco Encalada 2008 Santiago Chile
| | - Jonathan P. Hill
- WPI Center for Materials NanoarchitectonicsNational Institute for Materials Science, Namiki 1–1, Tsukuba Ibaraki 305-0044 Japan
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10
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Etcheverry-Berríos A, Olavarría I, Perrin ML, Díaz-Torres R, Jullian D, Ponce I, Zagal JH, Pavez J, Vásquez SO, van der Zant HSJ, Dulić D, Aliaga-Alcalde N, Soler M. Multiscale Approach to the Study of the Electronic Properties of Two Thiophene Curcuminoid Molecules. Chemistry 2016; 22:12808-18. [PMID: 27458818 DOI: 10.1002/chem.201601187] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Indexed: 12/26/2022]
Abstract
We studied the electronic and conductance properties of two thiophene-curcuminoid molecules, 2-thphCCM (1) and 3-thphCCM (2), in which the only structural difference is the position of the sulfur atoms in the thiophene terminal groups. We used electrochemical techniques as well as UV/Vis absorption studies to obtain the values of the HOMO-LUMO band gap energies, showing that molecule 1 has lower values than 2. Theoretical calculations show the same trend. Self-assembled monolayers (SAMs) of these molecules were studied by using electrochemistry, showing that the interaction with gold reduces drastically the HOMO-LUMO gap in both molecules to almost the same value. Single-molecule conductance measurements show that molecule 2 has two different conductance values, whereas molecule 1 exhibits only one. Based on theoretical calculations, we conclude that the lowest conductance value, similar in both molecules, corresponds to a van der Waals interaction between the thiophene ring and the electrodes. The one order of magnitude higher conductance value for molecule 2 corresponds to a coordinate (dative covalent) interaction between the sulfur atoms and the gold electrodes.
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Affiliation(s)
- Alvaro Etcheverry-Berríos
- Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beaucheff 851, Santiago, Chile
| | - Ignacio Olavarría
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Raúl Díaz-Torres
- Departament de Química Inorgànica, Universitat de Barcelona-ICMAB (Institute of MaterialsScience of Barcelona)-CSIC, Diagonal 645, 08028, Barcelona, Spain
| | - Domingo Jullian
- Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beaucheff 851, Santiago, Chile
| | - Ingrid Ponce
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo Ohiggins 3363, Estación Central, Santiago, Chile
| | - José H Zagal
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo Ohiggins 3363, Estación Central, Santiago, Chile
| | - Jorge Pavez
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo Ohiggins 3363, Estación Central, Santiago, Chile
| | - Sergio O Vásquez
- Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beaucheff 851, Santiago, Chile
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Diana Dulić
- Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Av. Blanco 2008, Santiago, Chile.
| | - Núria Aliaga-Alcalde
- ICREA Researcher (Institució Catalana de Recerca i Estudis Avançats) at the ICMAB-CSIC, Campus de la Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.
| | - Monica Soler
- Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beaucheff 851, Santiago, Chile.
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Verzijl CJO, Celis Gil JA, Perrin ML, Dulić D, van der Zant HSJ, Thijssen JM. Image effects in transport at metal-molecule interfaces. J Chem Phys 2015; 143:174106. [DOI: 10.1063/1.4934882] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- C. J. O. Verzijl
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
| | - J. A. Celis Gil
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
| | - M. L. Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
| | - D. Dulić
- Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago de Chile, Chile
| | - H. S. J. van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
| | - J. M. Thijssen
- Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
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Perrin ML, Frisenda R, Koole M, Seldenthuis JS, Gil JAC, Valkenier H, Hummelen JC, Renaud N, Grozema FC, Thijssen JM, Dulić D, van der Zant HSJ. Large negative differential conductance in single-molecule break junctions. Nat Nanotechnol 2014; 9:830-4. [PMID: 25173832 DOI: 10.1038/nnano.2014.177] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 07/21/2014] [Indexed: 05/24/2023]
Abstract
Molecular electronics aims at exploiting the internal structure and electronic orbitals of molecules to construct functional building blocks. To date, however, the overwhelming majority of experimentally realized single-molecule junctions can be described as single quantum dots, where transport is mainly determined by the alignment of the molecular orbital levels with respect to the Fermi energies of the electrodes and the electronic coupling with those electrodes. Particularly appealing exceptions include molecules in which two moieties are twisted with respect to each other and molecules in which quantum interference effects are possible. Here, we report the experimental observation of pronounced negative differential conductance in the current-voltage characteristics of a single molecule in break junctions. The molecule of interest consists of two conjugated arms, connected by a non-conjugated segment, resulting in two coupled sites. A voltage applied across the molecule pulls the energy of the sites apart, suppressing resonant transport through the molecule and causing the current to decrease. A generic theoretical model based on a two-site molecular orbital structure captures the experimental findings well, as confirmed by density functional theory with non-equilibrium Green's functions calculations that include the effect of the bias. Our results point towards a conductance mechanism mediated by the intrinsic molecular orbitals alignment of the molecule.
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Affiliation(s)
- Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Riccardo Frisenda
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Max Koole
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Johannes S Seldenthuis
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Jose A Celis Gil
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Hennie Valkenier
- 1] Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands [2] School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, UK
| | - Jan C Hummelen
- Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Nicolas Renaud
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Ferdinand C Grozema
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Joseph M Thijssen
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Diana Dulić
- 1] Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands [2] Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago de Chile, Chile
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
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13
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Perrin ML, Verzijl CJO, Martin CA, Shaikh AJ, Eelkema R, van Esch JH, van Ruitenbeek JM, Thijssen JM, van der Zant HSJ, Dulić D. Large tunable image-charge effects in single-molecule junctions. Nat Nanotechnol 2013; 8:282-7. [PMID: 23503093 DOI: 10.1038/nnano.2013.26] [Citation(s) in RCA: 152] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Accepted: 02/01/2013] [Indexed: 05/04/2023]
Abstract
Metal/organic interfaces critically determine the characteristics of molecular electronic devices, because they influence the arrangement of the orbital levels that participate in charge transport. Studies on self-assembled monolayers show molecule-dependent energy-level shifts as well as transport-gap renormalization, two effects that suggest that electric-field polarization in the metal substrate induced by the formation of image charges plays a key role in the alignment of the molecular energy levels with respect to the metal's Fermi energy. Here, we provide direct experimental evidence for an electrode-induced gap renormalization in single-molecule junctions. We study charge transport through single porphyrin-type molecules using electrically gateable break junctions. In this set-up, the position of the occupied and unoccupied molecular energy levels can be followed in situ under simultaneous mechanical control. When increasing the electrode separation by just a few ångströms, we observe a substantial increase in the transport gap and level shifts as high as several hundreds of meV. Analysis of this large and tunable gap renormalization based on atomic charges obtained from density functional theory confirms and clarifies the dominant role of image-charge effects in single-molecule junctions.
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Affiliation(s)
- Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
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14
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Perrin ML, Prins F, Martin CA, Shaikh AJ, Eelkema R, van Esch JH, Briza T, Kaplanek R, Kral V, van Ruitenbeek JM, van der Zant HSJ, Dulić D. Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single-Molecule Junctions. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104757] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Perrin ML, Prins F, Martin CA, Shaikh AJ, Eelkema R, van Esch JH, Briza T, Kaplanek R, Kral V, van Ruitenbeek JM, van der Zant HSJ, Dulić D. Influence of the chemical structure on the stability and conductance of porphyrin single-molecule junctions. Angew Chem Int Ed Engl 2011; 50:11223-6. [PMID: 21957060 DOI: 10.1002/anie.201104757] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Indexed: 11/12/2022]
Affiliation(s)
- Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
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Perrin ML, Martin CA, Prins F, Shaikh AJ, Eelkema R, van Esch JH, van Ruitenbeek JM, van der Zant HSJ, Dulić D. Charge transport in a zinc-porphyrin single-molecule junction. Beilstein J Nanotechnol 2011; 2:714-9. [PMID: 22043461 PMCID: PMC3201625 DOI: 10.3762/bjnano.2.77] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 09/26/2011] [Indexed: 05/04/2023]
Abstract
We have investigated charge transport in ZnTPPdT-Pyr (TPPdT: 5,15-di(p-thiolphenyl)-10,20-di(p-tolyl)porphyrin) molecular junctions using the lithographic mechanically controllable break-junction (MCBJ) technique at room temperature and cryogenic temperature (6 K). We combined low-bias statistical measurements with spectroscopy of the molecular levels in the form of I(V) characteristics. This combination allows us to characterize the transport in a molecular junction in detail. This complex molecule can form different junction configurations, having an observable effect on the trace histograms and the current-voltage (I(V)) measurements. Both methods show that multiple, stable single-molecule junction configurations can be obtained by modulating the interelectrode distance. In addition we demonstrate that different ZnTPPdT-Pyr junction configurations can lead to completely different spectroscopic features with the same conductance values. We show that statistical low-bias conductance measurements should be interpreted with care, and that the combination with I(V) spectroscopy represents an essential tool for a more detailed characterization of the charge transport in a single molecule.
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Affiliation(s)
- Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands
| | - Christian A Martin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands
| | - Ferry Prins
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands
| | - Ahson J Shaikh
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Rienk Eelkema
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Jan H van Esch
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Jan M van Ruitenbeek
- Kamerlingh Onnes Laboratory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands
| | - Diana Dulić
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands
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Affiliation(s)
- Diana Dulić
- CEA, Laboratoire d'Electronique Moléculaire, IRAMIS/SPEC, 91191 Gif sur Yvette cedex, France
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Dulić D, Pump F, Campidelli S, Lavie P, Cuniberti G, Filoramo A. Inside Cover: Controlled Stability of Molecular Junctions (Angew. Chem. Int. Ed. 44/2009). Angew Chem Int Ed Engl 2009. [DOI: 10.1002/anie.200905076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Dulić D, Pump F, Campidelli S, Lavie P, Cuniberti G, Filoramo A. Innentitelbild: Controlled Stability of Molecular Junctions (Angew. Chem. 44/2009). Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200905076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Dulić D, Tuukkanen S, Chung CL, Isambert A, Lavie P, Filoramo A. Direct conductance measurements of short single DNA molecules in dry conditions. Nanotechnology 2009; 20:115502. [PMID: 19420440 DOI: 10.1088/0957-4484/20/11/115502] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We present a study of electronic transport in short (12-base-pair) DNA duplexes covalently bonded (via thiol groups) to two gold electrodes obtained by a mechanically controllable break junction (MCJB) technique in dry conditions. A large number of DNA junctions have been repeatedly formed in order to obtain a conductance histogram that reveals a peak which corresponds to the conductance of a single DNA molecule. We observed that the conductivity of a DNA increases upon increasing the content of G:C base pairs in the duplex. With our method we are able to obtain a reliable value of a single DNA conductance and subsequently measure its current-voltage (I-V) characteristics. In contrast to the electronic transport measurements performed with long DNA sequences (hundreds of base pairs) where the obtained conductance values vary a lot with environmental conditions, our values obtained for the short DNA sequences are consistent with the values reported for comparable sequences in aqueous solution.
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Affiliation(s)
- Diana Dulić
- Laboratoire d'Electronique Moléculaire, Service de Physique de L'Etat Condensé (CNRS URA 2464), CEA, IRAMIS, F-91191 Gif-sur-Yvette, France.
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Dulić D, van der Molen SJ, Kudernac T, Jonkman HT, de Jong JJD, Bowden TN, van Esch J, Feringa BL, van Wees BJ. One-way optoelectronic switching of photochromic molecules on gold. Phys Rev Lett 2003; 91:207402. [PMID: 14683393 DOI: 10.1103/physrevlett.91.207402] [Citation(s) in RCA: 302] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2003] [Indexed: 05/24/2023]
Abstract
We investigate photochromic molecular switches that are self-assembled on gold. We use two experimental techniques; namely, the mechanically controllable break-junction technique to measure electronic transport, and UV/Vis spectroscopy to measure absorption. We observe switching of the molecules from the conducting to the insulating state when illuminated with visible light (lambda=546 nm), in spite of the gold surface plasmon absorption present around this wavelength. However, we fail to observe the reverse process which should occur upon illumination with UV light (lambda=313 nm). We attribute this to quenching of the excited state of the molecule in the open form by the presence of gold.
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Affiliation(s)
- Diana Dulić
- Physics of Nanodevices, Materials Science Centre, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Pimenov A, Loidl A, Dulić D, van der Marel D, Sutjahja IM, Menovsky AA. Magnetic field dependence of the transverse plasmon in SmLa(0.8)Sr(0.2)CuO(4-delta). Phys Rev Lett 2001; 87:177003. [PMID: 11690296 DOI: 10.1103/physrevlett.87.177003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2001] [Indexed: 05/23/2023]
Abstract
The magnetic field and temperature dependence of the transverse and longitudinal plasmons in SmLa(0.8)Sr(0.2)CuO(4-delta) have been investigated. A transition between a vortex-glass and a vortex-liquid regime, which revealed different field dependencies of the resonance frequencies, could be clearly observed. The positions and the spectral weights of the plasmons were successfully described using the multilayer model [Phys. Rev. B 64, 024530 (2001)], which takes the compressibility of the electronic liquid into account. The absolute value of the compressibility is close to that of a two-dimensional noninteracting electron gas.
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Affiliation(s)
- A Pimenov
- Experimentalphysik V, EKM, Universität Augsburg, 86135 Augsburg, Germany
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Dulić D, Hak SJ, van der Marel D, Hardy WN, Koshelev AE, Liang R, Bonn DA, Willemsen BA. Effects of vortex pinning and thermal fluctuations on the Josephson plasma resonance in Tl2Ba2CaCu2O8 and YBa2Cu3O6.5. Phys Rev Lett 2001; 86:4660-4663. [PMID: 11384308 DOI: 10.1103/physrevlett.86.4660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2000] [Indexed: 05/23/2023]
Abstract
We investigated the temperature dependence and c-axis magnetic field dependence of the Josephson plasma resonance in optimally doped Tl2Ba2CaCu2O8 thin films and underdoped YBa2Cu3O6.5 (YBCO) ortho-II single crystals using infrared spectroscopy. We obtained the c-axis penetration depths, at low temperature, in zero fields of about 20 and 7 microm, respectively. While the temperature dependencies of the resonances in the two compounds are very similar, the magnetic field dependence in YBCO is much weaker. We attribute this weak magnetic field dependence to the lower anisotropy of YBCO and interpret the observed behaviors in terms of thermal fluctuations and pinning of pancake vortices.
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Affiliation(s)
- D Dulić
- Laboratory of Solid State Physics, Materials Science Centre, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Dulić D, Pimenov A, van der Marel D, Broun DM, Kamal S, Hardy WN, Tsvetkov AA, Sutjaha IM, Liang R, Menovsky AA, Loidl A, Saxena SS. Observation of the transverse optical plasmon in SmLa0.8Sr0.2CuO4-delta. Phys Rev Lett 2001; 86:4144-4147. [PMID: 11328116 DOI: 10.1103/physrevlett.86.4144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2000] [Indexed: 05/23/2023]
Abstract
We present microwave and infrared measurements on SmLa0.8Sr0.2CuO4-delta, which are direct evidence for the existence of a transverse optical plasma mode, observed as a peak in the c-axis optical conductivity. This mode appears as a consequence of the existence of two different intrinsic Josephson couplings between the CuO2 layers, one with a Sm2O2 block layer, and the other one with a (La,Sr)2O2-delta block layer. From the frequencies and the intensities of the collective modes we determine the value of the compressibility of the two dimensional electron fluid in the copper oxygen planes.
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Affiliation(s)
- D Dulić
- Laboratory of Solid State Physics, Materials Science Centre, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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