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Electrical molecular switch addressed by chemical stimuli

Hassib Audi 1 Yannick Viero 2 N Alwhaibi 3 Zhongrui Chen 4 Maksym Iazykov 4 Arnaud Heynderickx 4 Fan Xiao 4 David Guérin 2, 5 Christophe Krzeminski 2, 6 Iain Mark Grace 3 Colin Lambert 3 Olivier Siri 4 Dominique Vuillaume 2, 7 Stéphane Lenfant 2 H.R. Klein 4, 8
5 CMNF-IEMN - Centrale de Micro Nano Fabrication - IEMN
IEMN - UMR 8520 - Institut d’Électronique, de Microélectronique et de Nanotechnologie - IEMN (Univ. Lille, CNRS, Ecole Centrale Lille, Yncréa-ISEN, UVHC)
6 PHYSIQUE-IEMN - Physique-IEMN
IEMN - UMR 8520 - Institut d’Électronique, de Microélectronique et de Nanotechnologie - IEMN (Univ. Lille, CNRS, Ecole Centrale Lille, Yncréa-ISEN, UVHC)
7 NCM-IEMN - Nanostructures, nanoComponents & Molecules - IEMN
IEMN - UMR 8520 - Institut d’Électronique, de Microélectronique et de Nanotechnologie - IEMN (Univ. Lille, CNRS, Ecole Centrale Lille, Yncréa-ISEN, UVHC)
Abstract : We demonstrate that the conductance switching of benzo-bis(imidazole) molecules upon protonation depends on the lateral functional groups. The protonated H-substituted molecule shows a higher con-ductance than the neutral one (G pro > G neu), while the opposite (G neu > G pro) is observed for a molecule laterally functionalized by amino-phenyl groups. These results are demonstrated at various scale lengths: self-assembled monolayers, tiny nanodot-molecule junctions and single molecules. From ab initio theoretical calculations, we conclude that for the H-substituted molecule, the result G pro > G neu is correctly explained by a reduction of the LUMO-HOMO gap, while for the amino-phenyl functionnalized molecule, the result G neu > G pro is consistent with a shift of the HOMO, which reduces the density of states at the Fermi energy.
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Submitted on : Monday, May 4, 2020 - 2:35:34 PM
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Hassib Audi, Yannick Viero, N Alwhaibi, Zhongrui Chen, Maksym Iazykov, et al.. Electrical molecular switch addressed by chemical stimuli. Nanoscale, Royal Society of Chemistry, 2020, 12 (18), pp.10127-10139. ⟨10.1039/D0NR02461A⟩. ⟨hal-02555592⟩

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