Electrical molecular switch addressed by chemical stimuli
Résumé
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.
Domaines
Physique [physics]
Fichier principal
nanoscale_2020_draft.pdf (1.89 Mo)
Télécharger le fichier
nanoscale_2020_si.pdf (10.05 Mo)
Télécharger le fichier
| Origine | Fichiers produits par l'(les) auteur(s) |
|---|
Loading...