This work examines whether electrochemical redox reactions are sensitive to the electron spin orientation by examining the effects of magnetic field and molecular chirality on the charge transfer process. The working electrode is either a ferromagnetic nickel film or a nickel film that is coated with an ultrathin (5–30 nm) gold overlayer. The electrode is coated with a self-assembled monolayer that immobilizes a redox couple containing chiral molecular units, either the redox active dye toluidine blue O with a chiral cysteine linking unit or cytochrome c. By varying the direction of magnetization of the nickel, toward or away from the adsorbed layer, we demonstrate that the electrochemical current depends on the orientation of the electrons’ spin. In the case of cytochrome c, the spin selectivity of the reduction is extremely high, namely, the reduction occurs mainly with electrons having their spin-aligned antiparallel to their velocity.

Field and chirality effects on electrochemical charge transfer rates: Spin dependent electrochemistry / Mondal, Prakash Chandra; Fontanesi, Claudio; Waldeck, David H.; Naaman, Ron. - In: ACS NANO. - ISSN 1936-0851. - STAMPA. - 9:3(2015), pp. 3377-3384. [10.1021/acsnano.5b00832]

Field and chirality effects on electrochemical charge transfer rates: Spin dependent electrochemistry

FONTANESI, Claudio;
2015

Abstract

This work examines whether electrochemical redox reactions are sensitive to the electron spin orientation by examining the effects of magnetic field and molecular chirality on the charge transfer process. The working electrode is either a ferromagnetic nickel film or a nickel film that is coated with an ultrathin (5–30 nm) gold overlayer. The electrode is coated with a self-assembled monolayer that immobilizes a redox couple containing chiral molecular units, either the redox active dye toluidine blue O with a chiral cysteine linking unit or cytochrome c. By varying the direction of magnetization of the nickel, toward or away from the adsorbed layer, we demonstrate that the electrochemical current depends on the orientation of the electrons’ spin. In the case of cytochrome c, the spin selectivity of the reduction is extremely high, namely, the reduction occurs mainly with electrons having their spin-aligned antiparallel to their velocity.
2015
12-mar-2015
9
3
3377
3384
Field and chirality effects on electrochemical charge transfer rates: Spin dependent electrochemistry / Mondal, Prakash Chandra; Fontanesi, Claudio; Waldeck, David H.; Naaman, Ron. - In: ACS NANO. - ISSN 1936-0851. - STAMPA. - 9:3(2015), pp. 3377-3384. [10.1021/acsnano.5b00832]
Mondal, Prakash Chandra; Fontanesi, Claudio; Waldeck, David H.; Naaman, Ron
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1078947
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