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Thomas L, Guérin D, Quinard B, Jacquet E, Mattana R, Seneor P, Vuillaume D, Mélin T, Lenfant S. Conductance switching at the nanoscale of diarylethene derivative self-assembled monolayers on La 0.7Sr 0.3MnO 3. NANOSCALE 2020; 12:8268-8276. [PMID: 32236177 DOI: 10.1039/c9nr09928j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report on the phosphonic acid route for the grafting of functional molecules, optical switch (dithienylethene diphosphonic acid, DDA), on La0.7Sr0.3MnO3 (LSMO). Compact self-assembled monolayers (SAMs) of DDA are formed on LSMO as studied by topographic atomic force microscopy (AFM), ellipsometry, water contact angle measurements and X-ray photoemission spectroscopy (XPS). The conducting AFM measurements show that the electrical conductance of LSMO/DDA is about 3 decades below that of a bare LSMO substrate. Moreover, the presence of the DDA SAM suppresses the known conductance switching of the LSMO substrate that is induced by mechanical and/or bias constraints during C-AFM measurements. A partial light-induced conductance switching between the open and closed forms of the DDA is observed for the LSMO/DDA/C-AFM tip molecular junctions (closed/open conductance ratio of about 8). We show that, in the case of long-time exposure to UV light, this feature can be masked by a non-reversible decrease (a factor of about 15) of the conductance of the LSMO electrode.
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Affiliation(s)
- L Thomas
- Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, Univ. Lille, 59652 Villeneuve d'Ascq, France.
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Wu M, Hou P, Dong L, Cai L, Chen Z, Zhao M, Li J. Manganese dioxide nanosheets: from preparation to biomedical applications. Int J Nanomedicine 2019; 14:4781-4800. [PMID: 31308658 PMCID: PMC6613456 DOI: 10.2147/ijn.s207666] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 05/23/2019] [Indexed: 12/15/2022] Open
Abstract
Advancements in nanotechnology and molecular biology have promoted the development of a diverse range of models to intervene in various disorders (from diagnosis to treatment and even theranostics). Manganese dioxide nanosheets (MnO2 NSs), a typical two-dimensional (2D) transition metal oxide of nanomaterial that possesses unique structure and distinct properties have been employed in multiple disciplines in recent decades, especially in the field of biomedicine, including biocatalysis, fluorescence sensing, magnetic resonance imaging and cargo-loading functionality. A brief overview of the different synthetic methodologies for MnO2 NSs and their state-of-the-art biomedical applications is presented below, as well as the challenges and future perspectives of MnO2 NSs.
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Affiliation(s)
- Muyu Wu
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China.,Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu, People's Republic of China
| | - Pingfu Hou
- Jiangsu Center for the Collaboration and Innovation of Cancer Biotherapy, Cancer Institute, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China
| | - Lina Dong
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China
| | - Lulu Cai
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China
| | - Zhudian Chen
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China
| | - Mingming Zhao
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China
| | - Jingjing Li
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China.,Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu, People's Republic of China.,Institute of Medical Imaging and Digital Medicine, Xuzhou Medical University, Xuzhou 221004, Jiangsu, People's Republic of China
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Forment-Aliaga A, Coronado E. Hybrid Interfaces in Molecular Spintronics. CHEM REC 2018; 18:737-748. [DOI: 10.1002/tcr.201700109] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 02/16/2018] [Indexed: 01/08/2023]
Affiliation(s)
- Alicia Forment-Aliaga
- Instituto de Ciencia Molecular; Universitat de València; C/ Catedrático José Beltrán, 2. 46980 Paterna Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular; Universitat de València; C/ Catedrático José Beltrán, 2. 46980 Paterna Spain
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Cinchetti M, Dediu VA, Hueso LE. Activating the molecular spinterface. NATURE MATERIALS 2017; 16:507-515. [PMID: 28439116 DOI: 10.1038/nmat4902] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 03/23/2017] [Indexed: 05/19/2023]
Abstract
The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba-Edelstein effect and the spin-momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.
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Affiliation(s)
- Mirko Cinchetti
- Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - V Alek Dediu
- Istituto per lo Studio dei Materiali Nanostrutturati CNRISMN, 40129 Bologna, Italy
| | - Luis E Hueso
- CIC nanoGUNE, 20018 San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
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Tatay S, Galbiati M, Delprat S, Barraud C, Bouzehouane K, Collin S, Deranlot C, Jacquet E, Seneor P, Mattana R, Petroff F. Self-assembled monolayers based spintronics: from ferromagnetic surface functionalization to spin-dependent transport. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:094010. [PMID: 26871682 DOI: 10.1088/0953-8984/28/9/094010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Chemically functionalized surfaces are studied for a wide range of applications going from medicine to electronics. Whereas non-magnetic surfaces have been widely studied, functionalization of magnetic surfaces is much less common and has almost never been used for spintronics applications. In this article we present the functionalization of La2/3Sr1/3MnO3, a ferromagnetic oxide, with self-assembled monolayers for spintronics. La2/3Sr1/3MnO3 is the prototypical half-metallic manganite used in spintronics studies. First, we show that La2/3Sr1/3MnO3 can be functionalized by alkylphosphonic acid molecules. We then emphasize the use of these functionalized surfaces in spintronics devices such as magnetic tunnel junctions fabricated using a nano-indentation based lithography technique. The observed exponential increase of tunnel resistance as a function of alkyl chain length is a direct proof of the successful connection of molecules to ferromagnetic electrodes. For all alkyl chains studied we obtain stable and robust tunnel magnetoresistance, with effects ranging from a few tens to 10 000%. These results show that functionalized electrodes can be integrated in spintronics devices and open the door to a molecular engineering of spintronics.
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Affiliation(s)
- Sergio Tatay
- Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France. Instituto de Ciencia Molecular (ICMol), Universitat de Valencia, C. Caterdratico Jose Beltran 2, 46980 Paterna, Spain
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Han R, Blobner F, Bauer J, Duncan DA, Barth JV, Feulner P, Allegretti F. Toward interfacing organic semiconductors with ferromagnetic transition metal substrates: enhanced stability via carboxylate anchoring. Chem Commun (Camb) 2016; 52:9805-8. [DOI: 10.1039/c6cc05009c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The controlled growth of chemically and structurally well-defined as well as thermally stable carboxylate-anchored self-assembled monolayers on ferromagnetic 3d transition metal substrates provides promising model systems for advanced studies of spin-dependent electron transport.
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Affiliation(s)
- R. Han
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
| | - F. Blobner
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
| | - J. Bauer
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
| | - D. A. Duncan
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
| | - J. V. Barth
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
| | - P. Feulner
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
| | - F. Allegretti
- Physik-Department E20
- Technische Universität München
- D-85748 Garching
- Germany
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Escalera-López D, Gómez E, Vallés E. Electrochemical growth of CoNi and Pt-CoNi soft magnetic composites on an alkanethiol monolayer-modified ITO substrate. Phys Chem Chem Phys 2015; 17:16575-86. [PMID: 26055346 DOI: 10.1039/c5cp02291f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
CoNi and Pt-CoNi magnetic layers on indium-tin oxide (ITO) substrates modified by an alkanethiol self-assembled monolayer (SAM) have been electrochemically obtained as an initial stage to prepare semiconducting layer-SAM-magnetic layer hybrid structures. The best conditions to obtain the maximum compactness of adsorbed layers of dodecanethiol (C12-SH) on ITO substrate have been studied using contact angle, AFM, XPS and electrochemical tests. The electrochemical characterization (electrochemical probe or voltammetric response in blank solutions) is fundamental to ensure the maximum blocking of the substrate. Although the electrodeposition process on the SAM-modified ITO substrate is very slow if the blocking of the surface is significant, non-cracked metallic layers of CoNi, with or without a previously electrodeposited seed-layer of platinum, have been obtained by optimizing the deposition potentials. Initial nucleation is expected to take place at the pinhole defects of the C12-SH SAM, followed by a mushroom-like growth regime through the SAM interface that allows the formation of a continuous metallic layer electrically connected to the ITO surface. Due to the potential of the methodology, the preparation of patterned metallic deposits on ITO substrate using SAMs with different coverage as templates is feasible.
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Affiliation(s)
- D Escalera-López
- Grup d'Electrodeposició de Capes Primes i Nanoestructures (Ge-CPN), Departament de Química Física and Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
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Barraud C, Bouzehouane K, Deranlot C, Fusil S, Jabbar H, Arabski J, Rakshit R, Kim DJ, Kieber C, Boukari S, Bowen M, Beaurepaire E, Seneor P, Mattana R, Petroff F. Unidirectional Spin-Dependent Molecule-Ferromagnet Hybridized States Anisotropy in Cobalt Phthalocyanine Based Magnetic Tunnel Junctions. PHYSICAL REVIEW LETTERS 2015; 114:206603. [PMID: 26047247 DOI: 10.1103/physrevlett.114.206603] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Indexed: 06/04/2023]
Abstract
Organic or molecular spintronics is a rising field of research at the frontier between condensed matter physics and chemistry. It aims to mix spin physics and the richness of chemistry towards designing new properties for spin electronics devices through engineering at the molecular scale. Beyond the expectation of a long spin lifetime, molecules can be also used to tailor the spin polarization of the injected current through the spin-dependent hybridization between molecules and ferromagnetic electrodes. In this Letter, we provide direct evidence of a hybrid interface spin polarization reversal due to the differing hybridization between phthalocyanine molecules and each cobalt electrode in Co/CoPc/Co magnetic tunnel junctions. Tunnel magnetoresistance and anisotropic tunnel magnetoresistance experiments show that interfacial hybridized electronic states have a unidirectional anisotropy that can be controlled by an electric field and that spin hybridization at the bottom and top interfaces differ, leading to an inverse tunnel magnetoresistance.
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Affiliation(s)
- Clément Barraud
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
| | - Karim Bouzehouane
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
| | - Cyrile Deranlot
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
| | - Stéphane Fusil
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
| | - Hashim Jabbar
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Jacek Arabski
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Rajib Rakshit
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Dong-Jik Kim
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Christophe Kieber
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Samy Boukari
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Martin Bowen
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Eric Beaurepaire
- IPCMS, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess BP 43, 67034 Strasbourg, France
| | - Pierre Seneor
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
| | - Richard Mattana
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
| | - Frédéric Petroff
- Unité Mixte de Physique CNRS/Thales, 1, Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris Sud, 91405 Orsay, France
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