Chirality-induced spin selectivity is evidenced by exciting the spin resonance of radicals in an electrochemical cell where the working electrode is covered with a chiral self-assembled monolayer. Because the electron transfer to and from the paramagnetic radical is spin dependent, the electrochemical current changes at resonance. This electrically-detected magnetic resonance (EDMR) is monitored by a lock-in detection based on electrode voltage modulation, at a frequency that optimizes the sensitivity of the differential conductance to the electrode charge transfer process. The method is validated using p-doped GaAs electrodes in which the conduction band electrons are hyperpolarized by a well-known method of optical spin pumping with circularly polarized light. Gold electrodes covered with peptides consisting of 5 alanine groups (Al5) present a relative current change of up to 5 × 10-5 when the resonance condition is met, corresponding to a spin filtering efficiency between 6 and 19%.

Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance / Blumenschein, F.; Tamski, M.; Roussel, C.; Smolinsky, E. Z. B.; Tassinari, F.; Naaman, R.; Ansermet, J. -P.. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 22:3(2020), pp. 997-1002. [10.1039/c9cp04681j]

Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance

Tassinari F.;Naaman R.;
2020

Abstract

Chirality-induced spin selectivity is evidenced by exciting the spin resonance of radicals in an electrochemical cell where the working electrode is covered with a chiral self-assembled monolayer. Because the electron transfer to and from the paramagnetic radical is spin dependent, the electrochemical current changes at resonance. This electrically-detected magnetic resonance (EDMR) is monitored by a lock-in detection based on electrode voltage modulation, at a frequency that optimizes the sensitivity of the differential conductance to the electrode charge transfer process. The method is validated using p-doped GaAs electrodes in which the conduction band electrons are hyperpolarized by a well-known method of optical spin pumping with circularly polarized light. Gold electrodes covered with peptides consisting of 5 alanine groups (Al5) present a relative current change of up to 5 × 10-5 when the resonance condition is met, corresponding to a spin filtering efficiency between 6 and 19%.
2020
22
3
997
1002
Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance / Blumenschein, F.; Tamski, M.; Roussel, C.; Smolinsky, E. Z. B.; Tassinari, F.; Naaman, R.; Ansermet, J. -P.. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 22:3(2020), pp. 997-1002. [10.1039/c9cp04681j]
Blumenschein, F.; Tamski, M.; Roussel, C.; Smolinsky, E. Z. B.; Tassinari, F.; Naaman, R.; Ansermet, J. -P.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1261980
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