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Vilà N, Nguyen L, Lacroix JC, Sun X, Walcarius A, Mbomekallé I. Assessing the Influence of Confinement on the Stability of Polyoxometalate-Functionalized Surfaces: A Soft Sequential Immobilization Approach for Electrochromic Devices. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26521-26536. [PMID: 38713480 DOI: 10.1021/acsami.4c01859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
A functionalization process has been developed and the experimental conditions optimized allowing the immobilization of first-row transition metal (Mn+) containing polyoxometalates (POMs) with the formula [M(H2O)P2W17O61](10-n)- on transparent indium-tin oxide (ITO) electrodes for electrochromic applications. Both flat ITO grafted with 4-sulfophenyl moieties and sulfonate-functionalized vertically oriented silica films on ITO have been used as electrode supports to evaluate possible confinement effects provided by the mesoporous matrix on the stability of the modified surfaces and their electrochromic properties. Functionalization involved a two-step sequential process: (i) the immobilization of hexaaqua metallic ions, such as Fe(H2O)63+, onto the sulfonate-functionalized materials achieved through hydrogen bonding interactions between the sulfonate functions and aqua ligands (water molecules) coordinated to the metallic ions facilitating and stabilizing the attachment of the metallic ions to the sulfonated surfaces; (ii) their coordination to [P2W17O61]10- species to generate "in situ" the target [Fe(H2O)P2W17O61]7- moieties. Comparison of the characterized surfaces clearly evidenced a significant improvement in the long-term stability of the nanostructured [Fe(H2O)P2W17O61]7--functionalized silica films compared to the less constrained flat [Fe(H2O)P2W17O61]7--modified ITO electrodes for which a rapid loss of [P2W17O61]10- species was observed. Concordantly, the [Fe(H2O)P2W17O61]7- POM confined in the mesoporous films coated on ITO gave rise to much better and stable electrochromic properties, with a transmittance modulation of 40% at 515 nm.
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Affiliation(s)
- Neus Vilà
- Université de Lorraine, CNRS, LCPME, Nancy F-54000, France
| | - Linh Nguyen
- Université Paris Cité, CNRS, ITODYS, Paris F-75, France
| | | | - Xiaonan Sun
- Université Paris Cité, CNRS, ITODYS, Paris F-75, France
| | | | - Israël Mbomekallé
- Université Paris Saclay CNRS, Institut de Chimie Physique,Orsay F-91405, France
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Moors M, Werner I, Bauer J, Lorenz J, Monakhov KY. Multistate switching of scanning tunnelling microscopy machined polyoxovanadate-dysprosium-phthalocyanine nanopatterns on graphite. NANOSCALE HORIZONS 2024; 9:233-237. [PMID: 38115762 DOI: 10.1039/d3nh00345k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
We demonstrate the first formation of stable, multistate switchable monolayers of polyoxometalates (POMs), which can be electronically triggered to higher charged states with increased conductance in the current-voltage profile at room temperature. These responsive two-dimensional monolayers are based on a fully oxidised dodecavanadate cage (POV12) equipped with Dy(III)-doped phthalocyanine (Pc) macrocycles adopting the face-on orientation on highly oriented pyrolytic graphite (HOPG). The layers can be lithographically processed by the tip of a scanning tunnelling microscope (STM) to machine patterns with diameters ranging from 30 to 150 nm2.
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Affiliation(s)
- Marco Moors
- Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, Leipzig 04318, Germany.
| | - Irina Werner
- Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, Leipzig 04318, Germany.
| | - Jens Bauer
- Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, Leipzig 04318, Germany.
| | - Jonas Lorenz
- Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, Leipzig 04318, Germany.
| | - Kirill Yu Monakhov
- Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, Leipzig 04318, Germany.
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Salhi J, Calupitan JP, Mattera M, Montero D, Miche A, Maruchenko R, Proust A, Izzet G, Kreher D, Arfaoui I, Volatron F. Ready-to-be-addressed oxo-clusters: individualized, periodically organized and separated from the substrate. NANOSCALE 2023; 15:13233-13238. [PMID: 37540202 DOI: 10.1039/d3nr02649c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Clusters and oxo-clusters are drawing attention for their amazing physical properties, especially at the scale of the single molecule. However, chemical methods to organize them individually on a surface are still lacking. In this study we show that it is possible to periodically organize individual polyoxometalates thanks to their ordering by a new supramolecular assembly.
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Affiliation(s)
- Juba Salhi
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
| | - Jan Patrick Calupitan
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
| | - Michele Mattera
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
| | - David Montero
- Fédération de chimie et matériaux de Paris-centre (FCMat), Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France
| | - Antoine Miche
- Laboratoire de réactivité de surface (LRS), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France
| | - Régina Maruchenko
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
| | - Anna Proust
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
| | - Guillaume Izzet
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
| | - David Kreher
- Institut Lavoisier de Versailles (ILV), CNRS, Université Paris-Saclay, 45 avenue des Etats-Unis, F-78035 Versailles, France
| | - Imad Arfaoui
- De la molécule aux nano-objets: réactivité, interactions et spectroscopies (MONARIS), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France
| | - Florence Volatron
- Institut parisien de chimie moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France.
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Monakhov KY. Implication of counter-cations for polyoxometalate-based nano-electronics. COMMENT INORG CHEM 2022. [DOI: 10.1080/02603594.2022.2157409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Huez C, Guérin D, Lenfant S, Volatron F, Calame M, Perrin ML, Proust A, Vuillaume D. Redox-controlled conductance of polyoxometalate molecular junctions. NANOSCALE 2022; 14:13790-13800. [PMID: 36102689 DOI: 10.1039/d2nr03457c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We demonstrate the reversible in situ photoreduction of molecular junctions of a phosphomolybdate [PMo12O40]3- monolayer self-assembled on flat gold electrodes, connected by the tip of a conductive atomic force microscope. The conductance of the one electron reduced [PMo12O40]4- molecular junction is increased by ∼10, and this open-shell state is stable in the junction in air at room temperature. The analysis of a large current-voltage dataset by unsupervised machine learning and clustering algorithms reveals that the electron transport in the pristine phosphomolybdate junctions leads to symmetric current-voltage curves, controlled by the lowest unoccupied molecular orbital (LUMO) at 0.6-0.7 eV above the Fermi energy with ∼25% of the junctions having a better electronic coupling to the electrodes than the main part of the dataset. This analysis also shows that a small fraction (∼18% of the dataset) of the molecules is already reduced. The UV light in situ photoreduced phosphomolybdate junctions systematically feature slightly asymmetric current-voltage behaviors, which is ascribed to the electron transport mediated by the single occupied molecular orbital (SOMO) nearly at resonance with the Fermi energy of the electrodes and by a closely located single unoccupied molecular orbital (SUMO) at ∼0.3 eV above the SOMO with a weak electronic coupling to the electrodes (∼50% of the dataset) or at ∼0.4 eV but with a better electrode coupling (∼50% of the dataset). These results shed light on the electronic properties of reversible switchable redox polyoxometalates, a key point for potential applications in nanoelectronic devices.
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Affiliation(s)
- Cécile Huez
- Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, University of Lille, Av. Poincaré, Villeneuve d'Ascq, France.
| | - David Guérin
- Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, University of Lille, Av. Poincaré, Villeneuve d'Ascq, France.
| | - Stéphane Lenfant
- Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, University of Lille, Av. Poincaré, Villeneuve d'Ascq, France.
| | - Florence Volatron
- Institut Parisien de Chimie Moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France
| | - Michel Calame
- EMPA, Transport at the Nanoscale Laboratory, 8600 Dübendorf, Switzerland
- Dept. of Physics and Swiss Nanoscience Institute, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Mickael L Perrin
- EMPA, Transport at the Nanoscale Laboratory, 8600 Dübendorf, Switzerland
- Department of Information Technology and Electrical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Anna Proust
- Institut Parisien de Chimie Moléculaire (IPCM), CNRS, Sorbonne Université, 4 Place Jussieu, F-75005 Paris, France
| | - Dominique Vuillaume
- Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, University of Lille, Av. Poincaré, Villeneuve d'Ascq, France.
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Fabre B, Falaise C, Cadot E. Polyoxometalates-Functionalized Electrodes for (Photo)Electrocatalytic Applications: Recent Advances and Prospects. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bruno Fabre
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, F-35000 Rennes, France
| | - Clément Falaise
- Institut Lavoisier de Versailles (UMR-CNRS 8180), UVSQ, Université Paris-Saclay, 45 Avenue des Etats-Unis, 78000 Versailles, France
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles (UMR-CNRS 8180), UVSQ, Université Paris-Saclay, 45 Avenue des Etats-Unis, 78000 Versailles, France
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A Lindqvist type hexamolybdate [Mo6O19]-modified graphene oxide hybrid catalyst: Highly efficient for the synthesis of benzimidazoles. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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