Experimental observation of the role of ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Title :
Experimental observation of the role of countercations on the electrical conductance of Preyssler-type polyoxometalate nanodevices
Author(s) :
Huez, Cécile [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Renaudineau, Séverine [Auteur]
Edifices PolyMétalliques [E-POM]
Institut Parisien de Chimie Moléculaire [IPCM]
Volatron, Florence [Auteur]
Edifices PolyMétalliques [E-POM]
Institut Parisien de Chimie Moléculaire [IPCM]
Proust, Anna [Auteur]
Edifices PolyMétalliques [E-POM]
Institut Parisien de Chimie Moléculaire [IPCM]
Vuillaume, Dominique [Auteur correspondant]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Renaudineau, Séverine [Auteur]
Edifices PolyMétalliques [E-POM]
Institut Parisien de Chimie Moléculaire [IPCM]
Volatron, Florence [Auteur]
Edifices PolyMétalliques [E-POM]
Institut Parisien de Chimie Moléculaire [IPCM]
Proust, Anna [Auteur]
Edifices PolyMétalliques [E-POM]
Institut Parisien de Chimie Moléculaire [IPCM]
Vuillaume, Dominique [Auteur correspondant]

Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Journal title :
Nanoscale
Pages :
10634-10641
Publisher :
Royal Society of Chemistry
Publication date :
2023-05-09
ISSN :
2040-3364
HAL domain(s) :
Physique [physics]
Chimie
Chimie
English abstract : [en]
Polyoxometalates are nanoscale molecular oxides with promising properties that are currently explored for molecule-based memory devices. In this work, we synthesize a series of Preyssler polyoxometalates (POMs), ...
Show more >Polyoxometalates are nanoscale molecular oxides with promising properties that are currently explored for molecule-based memory devices. In this work, we synthesize a series of Preyssler polyoxometalates (POMs), (Na-P5W30O110)14-,stabilized with four different counterions, H+, K+, NH4+ and tetrabutylammonium (TBA+), and we study the electron transport properties at the nanoscale (conductive atomic force microscopy, C-AFM) of molecular junctions formed by self-assembled monolayers (SAMs) of POMs electrostatically deposited on ultraflat gold surface prefunctionalized with a positively charged SAM of amine-terminated alkylthiol chains. We report that the electron transport properties of P5W30-based molecular junctions depend on the nature of the counterions, the low-bias current (in the voltage range -0.6 V to 0.6 V) gradually increasing by a factor ca. 100 by changing the counterion in the order K+, NH4+, H+ and TBA+. From a statistical study (hundreds of current-voltage traces) using a simple analytical model for charge transport in nanoscale devices, we show that the energy position of the lowest unoccupied molecular orbital (LUMO) of the P5W30 with respect of the Fermi energy of the electrodes increases from ca. 0.4 eV to 0.7 eV and that that electrode coupling energy also increases from ca. 0.05 to 1 meV in the same order from K+, NH4+, H+ to TBA+. We discuss several hypotheses on the possible origin of these features, such as a counterion-dependent dipole at the POM/electrode interface and counterion-modulated molecule/electrode hybridization, with, in both cases, the largest effect in the case of TBA+ counterions.Show less >
Show more >Polyoxometalates are nanoscale molecular oxides with promising properties that are currently explored for molecule-based memory devices. In this work, we synthesize a series of Preyssler polyoxometalates (POMs), (Na-P5W30O110)14-,stabilized with four different counterions, H+, K+, NH4+ and tetrabutylammonium (TBA+), and we study the electron transport properties at the nanoscale (conductive atomic force microscopy, C-AFM) of molecular junctions formed by self-assembled monolayers (SAMs) of POMs electrostatically deposited on ultraflat gold surface prefunctionalized with a positively charged SAM of amine-terminated alkylthiol chains. We report that the electron transport properties of P5W30-based molecular junctions depend on the nature of the counterions, the low-bias current (in the voltage range -0.6 V to 0.6 V) gradually increasing by a factor ca. 100 by changing the counterion in the order K+, NH4+, H+ and TBA+. From a statistical study (hundreds of current-voltage traces) using a simple analytical model for charge transport in nanoscale devices, we show that the energy position of the lowest unoccupied molecular orbital (LUMO) of the P5W30 with respect of the Fermi energy of the electrodes increases from ca. 0.4 eV to 0.7 eV and that that electrode coupling energy also increases from ca. 0.05 to 1 meV in the same order from K+, NH4+, H+ to TBA+. We discuss several hypotheses on the possible origin of these features, such as a counterion-dependent dipole at the POM/electrode interface and counterion-modulated molecule/electrode hybridization, with, in both cases, the largest effect in the case of TBA+ counterions.Show less >
Language :
Anglais
Popular science :
Non
Comment :
Preprint: full text, figures and supporting information
Source :
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