Nanoscale 2018, DOI: 10.1039/C7NR07243K

If the factors controlling the decay in single-molecule electrical conductance G with molecular length L could be understood and controlled, then this would be a significant step forward in the design of high-conductance molecular wires. For a wide variety of molecules conducting by phase coherent tunnelling, conductance G decays with length following the relationship G = AeβL. It is widely accepted that the attenuation coefficient β is determined by the position of the Fermi energy of the electrodes relative to the energy of frontier orbitals of the molecular bridge, whereas the terminal anchor groups which bind to the molecule to the electrodes contribute to the pre-exponential factor A. We examine this premise for several series of molecules which contain a central conjugated moiety (phenyl, viologen or α-terthiophene) connected on either side to alkane chains of varying length, with each end terminated by thiol or thiomethyl anchor groups. In contrast with this expectation, we demonstrate both experimentally and theoretically that additional electronic states located on thiol anchor groups can significantly decrease the value of β, by giving rise to resonances close to EF through coupling to the bridge moiety. This interplay between the gateway states and their coupling to a central conjugated moiety in the molecular bridges creates a new design strategy for realising higher-transmission molecular wires by taking advantage of the electrode–molecule interface properties.

TOC RSC Nano 2018

Uphill production of dihydrogen by enzymatic oxidation of glucose without an external energy source
Monday, 13 August 2018
E. Suraniti, P. Merzeau, J. Roche, S. Gounel, A. G. Mark, P. Fischer, N. Mano, A. Kuhn Nature Comm. 2018, 9:3229 Chemical systems do not allow the coupling of energy from several simple reactions to...
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Electrically Controlled Nano and Micro Actuation in Memristive Switching Device with On-Chip Gas Encapsulation
Monday, 09 July 2018
D. Kos, H. P. A. G. Astier, G. D. Martino, J. Mertens, H. Ohadi, D. De. Fazio, D. Yoon, Z. Zhao, A. Kuhn, A. C. Ferrari, C. J. B. Ford, J. J. Baumberg Small, 2018, in press,...
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TRPV1 activation induced by modulated or unmodulated 1800 MHz radiofrequency field exposure
Monday, 18 June 2018
Ruigrok, H.J., Arnaud-Cormos D., Hurtier A., Poque-Haro E., Poulletier de Gannes F., Ruffié G., Bonnaudin F, Lagroye I., Sojic N., Arbault S., Lévêque P., Veyret B. and Percherancier Y. Radiation...
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Correlations between gaseous and liquid phase chemistries induced by cold atmospheric plasmas in a physiological buffer
Monday, 18 June 2018
Girard F., Peret M., Dumont N., Badets V., Blanc S., Gazeli K., Noël C., Belmonte T., Marlin L., Cambus J.P., Simon G., Sojic N., Held B., Clément F. and Arbault S. Phys. Chem. Chem. Phys., 2018,...
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Electroformation of Phospholipid Giant Unilamellar Vesicles in a Physiological Buffer
Monday, 18 June 2018
Lefrançois P., Goudeau B., Arbault S. Integrative Biology, 2018, in press Phospholipid Giant Unilamellar Vesicles (GUVs) are usually prepared by electroformation in water, that is in a...
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Des biopiles enzymatiques pour alimenter des circuits électroniques implantables
Tuesday, 10 April 2018
E. Suraniti, A.G. Mark, J. Roche, H. Richter, A. Kuhn, P. Fischer, N. Mano L’Actualité Chimique 2018, 427-428,127-128 Une micro-source d’énergie intégrée permettrait à des implants...
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Current hot-spots and some more exotic topics
Tuesday, 10 April 2018
L. Bouffier, N. Sojic, A. Kuhn Current Opinion in Electrochemistry 2018, 7:A1–A4 This section of Current Opinion in Electrochemistry includes 17 articles contributed by groups from all over the...
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Une façon inhabituelle de briser la symétrie moléculaire: les métaux mesoporeux chiraux
Thursday, 22 February 2018
A. Kuhn L’Actualité Chimique 2018, 426,19-24 L’analyse et la synthèse des composés chiraux est d’une importance cruciale dans de nombreux domaines de la société et de la science, y...
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Gateway state-mediated, long-range tunnelling in molecular wires
Thursday, 01 February 2018
S. Sangtarash,  A. Vezzoli,  H. Sadeghi, N. Ferri,  H. M. O'Brien,  I. Grace,  L. Bouffier, S. J. Higgins, R. J. Nichols, C. J. Lambert. Nanoscale 2018, DOI:...
Tuning Electrochemiluminescence in Multi-Stimuli Responsive Hydrogel Films
Monday, 08 January 2018
Haidong Li, Silvia Voci, Valérie Ravaine and Neso Sojic J. Phys. Chem. Lett., 2018, 9, 340–345 Luminescent and redox properties of stimuli-responsive hydrogel materials have been modulated by...
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Bipolar Conducting Polymer Crawlers Based on Triple Symmetry Breaking
Friday, 15 December 2017
B. Gupta, B. Goudeau, P. Garrigue, A. Kuhn Adv. Funct. Mater. 2018, 1705825 see also video clip in Zeste de Science Bipolar electrochemistry can be used in different ways to induce motion of an...
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