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Article Dans Une Revue Nanoscale Année : 2020

Long-range electron transport in Prussian blue analog nanocrystals

Résumé

We report electron transport measurements through nano-scale devices consisting of 1 to 3 Prussian blue analog (PBA) nanoparticles connected between two electrodes. We compare two types of cubic nanoparticles, CsCoIIIFeII (15 nm) and CsNiIICrIII (6 nm), deposited on highly oriented pyrolytic graphite and contacted by conducting-AFM. The measured currents show an exponential dependence with the length of the PBA nano-device (up to 45 nm), with low decay factors β, in the range 0.05 - 0.1 nm-1 and 0.15 - 0.18 nm-1 for the CsCoFe and the CsNiCr nanoparticles, respectively. From the theoretical analysis of the current-voltage curve for the nano-scale device made of a single nanoparticle, we deduce that the electron transport is mediated by the localized d bands at around 0.5 eV from the electrode Fermi energy in the two cases. By comparison with ab-initio calculations, we tentatively identify the involved orbitals as the filled Fe(II)-t2g d band (HOMO) for CsCoFe and the half-filled Ni(II)-eg d band (SOMO) for CsNiCr. Conductance values measured for multi-nanoparticle nano-scale devices (2 and 3 nanoparticles between the electrodes) are consistent with a multi-step coherent tunneling in the off-resonance regime between adjacent PBAs, a simple model gives a strong coupling (around 0.3 eV) between the adjacent PBA nanoparticles, mediated by electrostatic interactions.
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Dates et versions

hal-03010948 , version 1 (11-07-2022)

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Roméo Bonnet, Stéphane Lenfant, Sandra Mazérat, Talal Mallah, Dominique Vuillaume. Long-range electron transport in Prussian blue analog nanocrystals. Nanoscale, 2020, 12 (39), pp.20374-20385. ⟨10.1039/d0nr06971j⟩. ⟨hal-03010948⟩
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