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  1. Article ; Online: Self-Assembled Monolayers of Molecular Conductors with Terpyridine-Metal Redox Switching Elements: A Combined AFM, STM and Electrochemical Study.

    Kocábová, Jana / Vavrek, František / Nováková Lachmanová, Štěpánka / Šebera, Jakub / Valášek, Michal / Hromadová, Magdaléna

    Molecules (Basel, Switzerland)

    2022  Volume 27, Issue 23

    Abstract: Self-assembled monolayers (SAMs) of terpyridine-based transition metal (ruthenium and osmium) complexes, anchored to gold substrate via tripodal anchoring groups, have been investigated as possible redox switching elements for molecular electronics. An ... ...

    Abstract Self-assembled monolayers (SAMs) of terpyridine-based transition metal (ruthenium and osmium) complexes, anchored to gold substrate via tripodal anchoring groups, have been investigated as possible redox switching elements for molecular electronics. An electrochemical study was complemented by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) methods. STM was used for determination of the SAM conductance values, and computation of the attenuation factor β from tunneling current-distance curves. We have shown that SAMs of
    Language English
    Publishing date 2022-11-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules27238320
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  2. Article ; Online: Environmental Control of Single-Molecule Junction Evolution and Conductance: A Case Study of Expanded Pyridinium Wiring.

    Nováková Lachmanová, Štěpánka / Kolivoška, Viliam / Šebera, Jakub / Gasior, Jindřich / Mészáros, Gábor / Dupeyre, Grégory / Lainé, Philippe P / Hromadová, Magdaléna

    Angewandte Chemie (International ed. in English)

    2021  Volume 60, Issue 9, Page(s) 4732–4739

    Abstract: Environmental control of single-molecule junction evolution and conductance was demonstrated for expanded pyridinium molecules by scanning tunneling microscopy break junction method and interpreted by quantum transport calculations including solvent ... ...

    Abstract Environmental control of single-molecule junction evolution and conductance was demonstrated for expanded pyridinium molecules by scanning tunneling microscopy break junction method and interpreted by quantum transport calculations including solvent molecules explicitly. Fully extended and highly conducting molecular junctions prevail in water environment as opposed to short and less conducting junctions formed in non-solvating mesitylene. A theoretical approach correctly models single-molecule conductance values considering the experimental junction length. Most pronounced difference in the molecular junction formation and conductance was identified for a molecule with the highest stabilization energy on the gold substrate confirming the importance of molecule-electrode interactions. Presented concept of tuning conductance through molecule-electrode interactions in the solvent-driven junctions can be used in the development of new molecular electronic devices.
    Language English
    Publishing date 2021-01-07
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202013882
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Does the Seebeck coefficient of a single-molecule junction depend on the junction configuration?

    Vavrek, František / Butsyk, Olena / Kolivoška, Viliam / Nováková Lachmanová, Štěpánka / Sebechlebská, Táňa / Šebera, Jakub / Gasior, Jindřich / Mészáros, Gábor / Hromadová, Magdaléna

    Journal of materials chemistry A. 2021 Aug. 17, v. 9, no. 32

    2021  

    Abstract: A new experimental method for the simultaneous determination of the electric and thermoelectric properties of metal–molecule–metal junctions at the single-molecule level has been developed to test the effects of the junction configuration on the ... ...

    Abstract A new experimental method for the simultaneous determination of the electric and thermoelectric properties of metal–molecule–metal junctions at the single-molecule level has been developed to test the effects of the junction configuration on the thermopower properties. The method is based on dynamic switching between (thermo)electric current and thermoelectric voltage measurements. Two model systems, 4,4′-bipyridine (1) and 4,4′-diaminostilbene (2), have been scrutinized. Single-molecule conductance (G) and thermopower (S) values were obtained for the two most probable junction configurations of 1 and 2, each having two different conductance values, GH (high) and GL (low), where GH > GL. Thermopower values of S(GH) = −6.4 ± 1.5 μV K⁻¹ and S(GL) = −7.0 ± 1.6 μV K⁻¹ were obtained for the molecular junctions of 1 and values of S(GH) = +14.4 ± 3.5 μV K⁻¹ and S(GL) = +10.4 ± 3.0 μV K⁻¹ were obtained for the molecular junctions of 2. The GH and S(GH) values for 1 and 2 are consistent with previously reported results. Thermopower values obtained simultaneously with conductance measurements for both configurations of 2 during junction evolution are reported for the first time. This work shows that, within experimental error, both S values are the same for each molecule, i.e., S(GH) ≈ S(GL), and they do not depend on the molecular junction configuration. This is an important finding, which supports claims that thermopower is an intensive property of matter. DFT calculations of transmission functions combined with a non-equilibrium Green's function approach complete this study.
    Keywords chemistry ; electric current ; electric potential difference ; evolution
    Language English
    Dates of publication 2021-0817
    Size p. 17512-17520.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d1ta05324h
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: The development of a fully integrated 3D printed electrochemical platform and its application to investigate the chemical reaction between carbon dioxide and hydrazine.

    Giorgini Escobar, João / Vaněčková, Eva / Nováková Lachmanová, Štěpánka / Vivaldi, Federico / Heyda, Jan / Kubišta, Jiří / Shestivska, Violetta / Španěl, Patrik / Schwarzová-Pecková, Karolina / Rathouský, Jiří / Sebechlebská, Táňa / Kolivoška, Viliam

    Electrochimica acta

    2020  Volume 360, Page(s) 136984

    Abstract: The combination of computer assisted design and 3D printing has recently enabled fast and inexpensive manufacture of customized 'reactionware' for broad range of electrochemical applications. In this work bi-material fused deposition modeling 3D printing ...

    Abstract The combination of computer assisted design and 3D printing has recently enabled fast and inexpensive manufacture of customized 'reactionware' for broad range of electrochemical applications. In this work bi-material fused deposition modeling 3D printing is utilized to construct an integrated platform based on a polyamide electrochemical cell and electrodes manufactured from a polylactic acid-carbon nanotube conductive composite. The cell contains separated compartments for the reference and counter electrode and enables reactants to be introduced and inspected under oxygen-free conditions. The developed platform was employed in a study investigating the electrochemical oxidation of aqueous hydrazine coupled to its bulk reaction with carbon dioxide. The analysis of cyclic voltammograms obtained in reaction mixtures with systematically varied composition confirmed that the reaction between hydrazine and carbon dioxide follows 1/1 stoichiometry and the corresponding equilibrium constant amounts to (2.8 ± 0.6) × 10
    Keywords covid19
    Language English
    Publishing date 2020-08-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1483548-4
    ISSN 0013-4686
    ISSN 0013-4686
    DOI 10.1016/j.electacta.2020.136984
    Database MEDical Literature Analysis and Retrieval System OnLINE

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