1
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Redolat J, Camarena-Pérez M, Griol A, Lozano MS, Gómez-Gómez MI, Vázquez-Lozano JE, Miele E, Baumberg JJ, Martínez A, Pinilla-Cienfuegos E. Synthesis and Raman Detection of 5-Amino-2-mercaptobenzimidazole Self-Assembled Monolayers in Nanoparticle-on-a-Mirror Plasmonic Cavity Driven by Dielectric Waveguides. Nano Lett 2024; 24:3670-3677. [PMID: 38483128 PMCID: PMC10979432 DOI: 10.1021/acs.nanolett.3c04932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Functionalization of metallic surfaces by molecular monolayers is a key process in fields such as nanophotonics or biotechnology. To strongly enhance light-matter interaction in such monolayers, nanoparticle-on-a-mirror (NPoM) cavities can be formed by placing metal nanoparticles on such chemically functionalized metallic monolayers. In this work, we present a novel functionalization process of gold surfaces using 5-amino-2-mercaptobenzimidazole (5-A-2MBI) molecules, which can be used for upconversion from THz to visible frequencies. The synthesized surfaces and NPoM cavities are characterized by Raman spectroscopy, atomic force microscopy (AFM), and advancing-receding contact angle measurements. Moreover, we show that NPoM cavities can be efficiently integrated on a silicon-based photonic chip performing pump injection and Raman-signal extraction via silicon nitride waveguides. Our results open the way for the use of 5-A-2MBI monolayers in different applications, showing that NPoM cavities can be effectively integrated with photonic waveguides, enabling on-chip enhanced Raman spectroscopy or detection of infrared and THz radiation.
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Affiliation(s)
- Javier Redolat
- Nanophotonics
Technology Center, Universitat Politècnica
de València, Valencia E46022, Spain
| | - María Camarena-Pérez
- Nanophotonics
Technology Center, Universitat Politècnica
de València, Valencia E46022, Spain
| | - Amadeu Griol
- Nanophotonics
Technology Center, Universitat Politècnica
de València, Valencia E46022, Spain
| | - Miguel Sinusia Lozano
- Nanophotonics
Technology Center, Universitat Politècnica
de València, Valencia E46022, Spain
| | | | - J. Enrique Vázquez-Lozano
- Department
of Electrical, Electronic and Communications Engineering, Institute
of Smart Cities (ISC), Universidad Pú́blica
de Navarra (UPNA), 31006 Pamplona, Spain
| | - Ermanno Miele
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United
Kingdom
| | - Jeremy J. Baumberg
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United
Kingdom
| | - Alejandro Martínez
- Nanophotonics
Technology Center, Universitat Politècnica
de València, Valencia E46022, Spain
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2
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Redolat J, Camarena-Pérez M, Griol A, Kovylina M, Xomalis A, Baumberg JJ, Martínez A, Pinilla-Cienfuegos E. Accurate Transfer of Individual Nanoparticles onto Single Photonic Nanostructures. ACS Appl Mater Interfaces 2023; 15:3558-3565. [PMID: 36538469 PMCID: PMC9869328 DOI: 10.1021/acsami.2c13633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
Controlled integration of metallic nanoparticles (NPs) onto photonic nanostructures enables the realization of complex devices for extreme light confinement and enhanced light-matter interaction. For instance, such NPs could be massively integrated on metal plates to build nanoparticle-on-mirror (NPoM) nanocavities or photonic integrated waveguides (WGs) to build WG-driven nanoantennas. However, metallic NPs are usually deposited via drop-casting, which prevents their accurate positioning. Here, we present a methodology for precise transfer and positioning of individual NPs onto different photonic nanostructures. Our method is based on soft lithography printing that employs elastomeric stamp-assisted transfer of individual NPs onto a single nanostructure. It can also parallel imprint many individual NPs with high throughput and accuracy in a single step. Raman spectroscopy confirms enhanced light-matter interactions in the resulting NPoM-based nanophotonic devices. Our method mixes top-down and bottom-up nanofabrication techniques and shows the potential of building complex photonic nanodevices for multiple applications ranging from enhanced sensing and spectroscopy to signal processing.
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Affiliation(s)
- Javier Redolat
- Nanophotonics
Technology Center, Universitat Politècnica
de València, ValenciaE46022, Spain
| | - María Camarena-Pérez
- Nanophotonics
Technology Center, Universitat Politècnica
de València, ValenciaE46022, Spain
| | - Amadeu Griol
- Nanophotonics
Technology Center, Universitat Politècnica
de València, ValenciaE46022, Spain
| | - Miroslavna Kovylina
- Nanophotonics
Technology Center, Universitat Politècnica
de València, ValenciaE46022, Spain
| | - Angelos Xomalis
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, CambridgeCB3 0HE, U.K.
- Laboratory
for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Science and Technology, Thun3602, Switzerland
| | - Jeremy J. Baumberg
- NanoPhotonics
Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, CambridgeCB3 0HE, U.K.
| | - Alejandro Martínez
- Nanophotonics
Technology Center, Universitat Politècnica
de València, ValenciaE46022, Spain
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3
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Díaz-Escobar E, Bauer T, Pinilla-Cienfuegos E, Barreda ÁI, Griol A, Kuipers L, Martínez A. Radiationless anapole states in on-chip photonics. Light Sci Appl 2021; 10:204. [PMID: 34608131 PMCID: PMC8490413 DOI: 10.1038/s41377-021-00647-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 09/06/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
High-index nanoparticles are known to support radiationless states called anapoles, where dipolar and toroidal moments interfere to inhibit scattering to the far field. In order to exploit the striking properties arising from these interference conditions in photonic integrated circuits, the particles must be driven in-plane via integrated waveguides. Here, we address the excitation of electric anapole states in silicon disks when excited on-chip at telecom wavelengths. In contrast to normal illumination, we find that the anapole condition-identified by a strong reduction of the scattering-does not overlap with the near-field energy maximum, an observation attributed to retardation effects. We experimentally verify the two distinct spectral regions in individual disks illuminated in-plane from closely placed waveguide terminations via far-field and near-field measurements. Our finding has important consequences concerning the use of anapole states and interference effects of other Mie-type resonances in high-index nanoparticles for building complex photonic integrated circuitry.
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Affiliation(s)
- Evelyn Díaz-Escobar
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - Thomas Bauer
- Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA, Delft, The Netherlands
| | - Elena Pinilla-Cienfuegos
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - Ángela I Barreda
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Straße 15, 07745, Jena, Germany
| | - Amadeu Griol
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - L Kuipers
- Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA, Delft, The Netherlands.
| | - Alejandro Martínez
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
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4
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Marques-Moros F, Forment-Aliaga A, Pinilla-Cienfuegos E, Canet-Ferrer J. Mirror effect in atomic force microscopy profiles enables tip reconstruction. Sci Rep 2020; 10:18911. [PMID: 33144609 PMCID: PMC7641199 DOI: 10.1038/s41598-020-75785-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 10/09/2020] [Indexed: 11/29/2022] Open
Abstract
In this work, the tip convolution effect in atomic force microscopy is revisited to illustrate the capabilities of cubic objects for determination of the tip shape and size. Using molecular-based cubic nanoparticles as a reference, a two-step tip reconstruction process has been developed. First, the tip-to-face angle is estimated by means of an analysis of the convolution error while the tip radius is extracted from the experimental profiles. The results obtained are in good agreement with specification of the tip supplier even though the experiments have been conducted using real distribution of nanoparticles with dispersion in size and aspect ratio. This demonstrates the reliability of our method and opens the door for a more accurate tip reconstruction by using calibration standards.
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Affiliation(s)
| | | | | | - Josep Canet-Ferrer
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Paterna, Spain.
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5
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Ortiz de Zárate D, García-Meca C, Pinilla-Cienfuegos E, Ayúcar JA, Griol A, Bellières L, Hontañón E, Kruis FE, Martí J. Green and Sustainable Manufacture of Ultrapure Engineered Nanomaterials. Nanomaterials (Basel) 2020; 10:nano10030466. [PMID: 32150817 PMCID: PMC7153611 DOI: 10.3390/nano10030466] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 02/28/2020] [Accepted: 03/03/2020] [Indexed: 11/25/2022]
Abstract
Nanomaterials with very specific features (purity, colloidal stability, composition, size, shape, location…) are commonly requested by cutting-edge technologic applications, and hence a sustainable process for the mass-production of tunable/engineered nanomaterials would be desirable. Despite this, tuning nano-scale features when scaling-up the production of nanoparticles/nanomaterials has been considered the main technological barrier for the development of nanotechnology. Aimed at overcoming these challenging frontier, a new gas-phase reactor design providing a shorter residence time, and thus a faster quenching of nanoclusters growth, is proposed for the green, sustainable, versatile, cost-effective, and scalable manufacture of ultrapure engineered nanomaterials (ranging from nanoclusters and nanoalloys to engineered nanostructures) with a tunable degree of agglomeration, composition, size, shape, and location. This method enables: (1) more homogeneous, non-agglomerated ultrapure Au-Ag nanoalloys under 10 nm; (2) 3-nm non-agglomerated ultrapure Au nanoclusters with lower gas flow rates; (3) shape-controlled Ag NPs; and (4) stable Au and Ag engineered nanostructures: nanodisks, nanocrosses, and 3D nanopillars. In conclusion, this new approach paves the way for the green and sustainable mass-production of ultrapure engineered nanomaterials.
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Affiliation(s)
- David Ortiz de Zárate
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
- Correspondence:
| | - Carlos García-Meca
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
| | - Elena Pinilla-Cienfuegos
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
| | - José A. Ayúcar
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
| | - Amadeu Griol
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
| | - Laurent Bellières
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
| | - Esther Hontañón
- Grupo de Nanosensores y Sistemas Inteligentes (NoySI), CSIC, 28006 Madrid, Spain;
| | - Frank E. Kruis
- Institute of Nanostructures and Technology, University Duisburg-Essen, 47057 Duisburg, Germany;
| | - Javier Martí
- Valencia Nanophotonics Technology Center, Universitat Politècnica de València, 46022 València, Spain; (C.G.-M.); (E.P.-C.); (J.A.A.); (A.G.); (L.B.); (J.M.)
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6
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Sabek J, Díaz-Fernández FJ, Torrijos-Morán L, Díaz-Betancor Z, Maquieira Á, Bañuls MJ, Pinilla-Cienfuegos E, García-Rupérez J. Experimental study of an evanescent-field biosensor based on 1D photonic bandgap structures. Beilstein J Nanotechnol 2019; 10:967-974. [PMID: 31165023 PMCID: PMC6541322 DOI: 10.3762/bjnano.10.97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 04/18/2019] [Indexed: 05/03/2023]
Abstract
A photonic bandgap (PBG) biosensor has been developed for the label-free detection of proteins. As the sensing in this type of structures is governed by the interaction between the evanescent field going into the cladding and the target analytes, scanning near-field optical microscopy has been used to characterize the profile of that evanescent field. The study confirms the strong exponential decrease of the signal as it goes into the cladding. This means that biorecognition events must occur as close to the PBG structure surface as possible in order to obtain the maximum sensing response. Within this context, the PBG biosensor has been biofunctionalized with half-antibodies specific to bovine serum albumin (BSA) using a UV-induced immobilization procedure. The use of half-antibodies allows one to reduce the thickness of the biorecognition volume down to ca. 2.5 nm, thus leading to a higher interaction with the evanescent field, as well as a proper orientation of their binding sites towards the target sample. Then, the biofunctionalized PBG biosensor has been used to perform a direct and real-time detection of the target BSA antigen.
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Affiliation(s)
- Jad Sabek
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | | | - Luis Torrijos-Morán
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Zeneida Díaz-Betancor
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Ángel Maquieira
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - María-José Bañuls
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Elena Pinilla-Cienfuegos
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Jaime García-Rupérez
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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7
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Navarro-Moratalla E, Island JO, Mañas-Valero S, Pinilla-Cienfuegos E, Castellanos-Gomez A, Quereda J, Rubio-Bollinger G, Chirolli L, Silva-Guillén JA, Agraït N, Steele GA, Guinea F, van der Zant HSJ, Coronado E. Enhanced superconductivity in atomically thin TaS2. Nat Commun 2016; 7:11043. [PMID: 26984768 PMCID: PMC5512558 DOI: 10.1038/ncomms11043] [Citation(s) in RCA: 127] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Accepted: 02/15/2016] [Indexed: 12/14/2022] Open
Abstract
The ability to exfoliate layered materials down to the single layer limit has presented the opportunity to understand how a gradual reduction in dimensionality affects the properties of bulk materials. Here we use this top–down approach to address the problem of superconductivity in the two-dimensional limit. The transport properties of electronic devices based on 2H tantalum disulfide flakes of different thicknesses are presented. We observe that superconductivity persists down to the thinnest layer investigated (3.5 nm), and interestingly, we find a pronounced enhancement in the critical temperature from 0.5 to 2.2 K as the layers are thinned down. In addition, we propose a tight-binding model, which allows us to attribute this phenomenon to an enhancement of the effective electron–phonon coupling constant. This work provides evidence that reducing the dimensionality can strengthen superconductivity as opposed to the weakening effect that has been reported in other 2D materials so far. As a material's thickness decreases towards the atomic-scale, dimensional confinement may promote behaviour not found in the bulk, with potential technological applications. Here, the authors study superconductivity in TaS2 as it is mechanically exfoliated towards the two-dimensional limit.
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Affiliation(s)
- Efrén Navarro-Moratalla
- Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2, Paterna 46980, Spain
| | - Joshua O Island
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
| | - Samuel Mañas-Valero
- Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2, Paterna 46980, Spain
| | | | - Andres Castellanos-Gomez
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
| | - Jorge Quereda
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Campus de Cantoblanco, Madrid 28049, Spain
| | - Gabino Rubio-Bollinger
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Campus de Cantoblanco, Madrid 28049, Spain.,Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Luca Chirolli
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia), Calle Farady 9, Cantoblanco, Madrid 28049, Spain
| | - Jose Angel Silva-Guillén
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia), Calle Farady 9, Cantoblanco, Madrid 28049, Spain
| | - Nicolás Agraït
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Campus de Cantoblanco, Madrid 28049, Spain.,Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid 28049, Spain.,Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia), Calle Farady 9, Cantoblanco, Madrid 28049, Spain
| | - Gary A Steele
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
| | - Francisco Guinea
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA- Nanociencia), Calle Farady 9, Cantoblanco, Madrid 28049, Spain
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
| | - Eugenio Coronado
- Universidad de Valencia (ICMol), Catedrático José Beltrán Martínez n° 2, Paterna 46980, Spain
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8
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Pinilla-Cienfuegos E, Mañas-Valero S, Forment-Aliaga A, Coronado E. Switching the Magnetic Vortex Core in a Single Nanoparticle. ACS Nano 2016; 10:1764-1770. [PMID: 26745548 DOI: 10.1021/acsnano.5b06776] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Imaging and manipulating the spin structure of nano- and mesoscale magnetic systems is a challenging topic in magnetism, yielding a wide range of spin phenomena such as skyrmions, hedgehog-like spin structures, or vortices. A key example has been provided by the vortex spin texture, which can be addressed in four independent states of magnetization, enabling the development of multibit magnetic storage media. Most of the works devoted to the study of the magnetization reversal mechanisms of the magnetic vortices have been focused on micrometer-size magnetic platelets. Here we report the experimental observation of the vortex state formation and annihilation in individual 25 nm molecular-based magnetic nanoparticles measured by low-temperature variable-field magnetic force microscopy. Interestingly, in these nanoparticles the switching of the vortex core can be induced with very small values of the applied static magnetic field.
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Affiliation(s)
- Elena Pinilla-Cienfuegos
- Instituto de Ciencia Molecular (ICMol), Universitat de València , Catedrático José Beltrán 2, E46980 Paterna, Spain
| | - Samuel Mañas-Valero
- Instituto de Ciencia Molecular (ICMol), Universitat de València , Catedrático José Beltrán 2, E46980 Paterna, Spain
| | - Alicia Forment-Aliaga
- Instituto de Ciencia Molecular (ICMol), Universitat de València , Catedrático José Beltrán 2, E46980 Paterna, Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universitat de València , Catedrático José Beltrán 2, E46980 Paterna, Spain
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9
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Sherif S, Rubio-Bollinger G, Pinilla-Cienfuegos E, Coronado E, Cuevas JC, Agraït N. Current rectification in a single molecule diode: the role of electrode coupling. Nanotechnology 2015; 26:291001. [PMID: 26133791 DOI: 10.1088/0957-4484/26/29/291001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate large rectification ratios (> 100) in single-molecule junctions based on a metal-oxide cluster (polyoxometalate), using a scanning tunneling microscope (STM) both at ambient conditions and at low temperature. These rectification ratios are the largest ever observed in a single-molecule junction, and in addition these junctions sustain current densities larger than 10(5) A cm(-2). By following the variation of the I-V characteristics with tip-molecule separation we demonstrate unambiguously that rectification is due to asymmetric coupling to the electrodes of a molecule with an asymmetric level structure. This mechanism can be implemented in other type of molecular junctions using both organic and inorganic molecules and provides a simple strategy for the rational design of molecular diodes.
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Affiliation(s)
- Siya Sherif
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience), Faraday, 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain. Departamento de Física de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Facultad de Ciencias, c/ Francisco Tomás y Valiente, 7 Universidad Autónoma de Madrid 28049 Madrid, Spain
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10
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Canet-Ferrer J, Coronado E, Forment-Aliaga A, Pinilla-Cienfuegos E. Correction of the tip convolution effects in the imaging of nanostructures studied through scanning force microscopy. Nanotechnology 2014; 25:395703. [PMID: 25201128 DOI: 10.1088/0957-4484/25/39/395703] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
AFM images are always affected by artifacts arising from tip convolution effects, resulting in a decrease in the lateral resolution of this technique. The magnitude of such effects is described by means of geometrical considerations, thereby providing better understanding of the convolution phenomenon. We demonstrate that for a constant tip radius, the convolution error is increased with the object height, mainly for the narrowest motifs. Certain influence of the object shape is observed between rectangular and elliptical objects with the same height. Such moderate differences are essentially expected among elongated objects; in contrast they are reduced as the object aspect ratio is increased. Finally, we propose an algorithm to study the influence of the size, shape and aspect ratio of different nanometric motifs on a flat substrate. Indeed, with this algorithm, convolution artifacts can be extended to any kind of motif including real surface roughness. From the simulation results we demonstrate that in most cases the real motif's width can be estimated from AFM images without knowing its shape in detail.
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Affiliation(s)
- Josep Canet-Ferrer
- Instituto de ciencia molecular (ICMol) de la Universidad de Valencia, c/ Catedrático José Beltrán Martínez num. 2, E46980 Paterna, Spain
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11
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Galán-Mascarós JR, Coronado E, Forment-Aliaga A, Monrabal-Capilla M, Pinilla-Cienfuegos E, Ceolin M. Tuning Size and Thermal Hysteresis in Bistable Spin Crossover Nanoparticles. Inorg Chem 2010; 49:5706-14. [DOI: 10.1021/ic100751a] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- José Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), Av. Paisos Catalans, 16, 43007 − Tarragona, Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMOL), Universidad de Valencia, Catedrático José Beltrán, 2, 46980 − Paterna, Spain
| | - Alicia Forment-Aliaga
- Instituto de Ciencia Molecular (ICMOL), Universidad de Valencia, Catedrático José Beltrán, 2, 46980 − Paterna, Spain
| | - María Monrabal-Capilla
- Instituto de Ciencia Molecular (ICMOL), Universidad de Valencia, Catedrático José Beltrán, 2, 46980 − Paterna, Spain
| | - Elena Pinilla-Cienfuegos
- Instituto de Ciencia Molecular (ICMOL), Universidad de Valencia, Catedrático José Beltrán, 2, 46980 − Paterna, Spain
| | - Marcelo Ceolin
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (UNLP-CONICET), Diagonal 113 y 64, 1900 − La Plata, Argentina
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Martínez RV, Martínez J, Chiesa M, Garcia R, Coronado E, Pinilla-Cienfuegos E, Tatay S. Large-scale nanopatterning of single proteins used as carriers of magnetic nanoparticles. Adv Mater 2010; 22:588-591. [PMID: 20217754 DOI: 10.1002/adma.200902568] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- Ramsés V Martínez
- Instituto de Microelectrónica de Madrid, CSIC Isaac Newton 8, 28760 Tres Cantos, Madrid, Spain
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Abellán G, Coronado E, Martí-Gastaldo C, Pinilla-Cienfuegos E, Ribera A. Hexagonal nanosheets from the exfoliation of Ni2+-Fe3+ LDHs: a route towards layered multifunctional materials. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01447h] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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