53 results match your criteria magneto-plasmonic nanoparticles

The design of magneto-plasmonic nanostructures formed by magnetic Prussian Blue-type nanocrystals decorated with Au nanoparticles.

Chem Commun (Camb) 2021 Feb;57(15):1903-1906

Instituto de Ciencia Molecular, Universitat de València, Catedrático José Beltran 2, 46980, Paterna, Spain.

We have developed a general protocol for the preparation of hybrid nanostructures formed by nanoparticles (NPs) of molecule-based magnets based on Prussian Blue Analogues (PBAs) decorated with plasmonic Au NPs of different shapes. By adjusting the pH, Au NPs can be attached preferentially along the edges of the PBA or randomly on the surface. The protocol allows tuning the plasmonic properties of the hybrids in the whole visible spectrum. Read More

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February 2021

Fast detection of SARS-CoV-2 RNA via the integration of plasmonic thermocycling and fluorescence detection in a portable device.

Nat Biomed Eng 2020 12 3;4(12):1159-1167. Epub 2020 Dec 3.

Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, Republic of Korea.

The diagnosis of severe acute respiratory syndrome 2 (SARS-CoV-2) infection by quantitative PCR with reverse transcription (RT-qPCR) typically involves bulky instrumentation in centralized laboratories and an assay time of 1-2 h. Here, we show that SARS-CoV-2 RNA can be detected in 17 min via a portable device integrating reverse transcription, fast thermocycling (via plasmonic heating through magneto-plasmonic nanoparticles) and in situ fluorescence detection following magnetic clearance of the nanoparticles. The device correctly classified all nasopharyngeal, oropharyngeal and sputum samples from 75 patients with COVID-19 and 75 healthy controls, with good concordance in fluorescence intensity with standard RT-qPCR (Pearson coefficients > 0. Read More

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December 2020

Defect-assisted synthesis of magneto-plasmonic silver-spinel ferrite heterostructures in a flower-like architecture.

Sci Rep 2020 Oct 12;10(1):17015. Epub 2020 Oct 12.

Department of Chemical and Geological Sciences, University of Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Italy.

Artificial nano-heterostructures (NHs) with controlled morphology, obtained by combining two or more components in several possible architectures, make them suitable for a wide range of applications. Here, we propose an oleate-based solvothermal approach to design silver-spinel ferrite flower-like NHs. Small oleate-coated silver nanoparticles were used as seeds for the growth of magnetic spinel ferrite (cobalt ferrite and spinel iron oxide) nanodomains on their surface. Read More

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October 2020

Facile synthesis of Au@MnO magneto-plasmonic nanoflowers for -weighted magnetic resonance imaging and photothermal therapy of cancer.

J Mater Chem B 2020 09;8(36):8356-8367

Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices, & Key Laboratory of Additive Manufacturing Materials of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.

The integration of advanced diagnostic contrast agents with versatile therapeutic drugs is an effective method for cancer treatment. However, combining various biocompatible theranostic modalities into a single platform at the nanoscale is a challenging assignment. In this work, we report a simple chemical synthetic route for producing a homogeneous hybrid nanoflower shaped morphology based on Au@Mn3O4 magneto-plasmonic nanomaterials. Read More

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September 2020

Magneto-Optical Nanostructures for Viral Sensing.

Nanomaterials (Basel) 2020 Jun 29;10(7). Epub 2020 Jun 29.

Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN-UMR CNRS 8520), University Lille, CNRS, Centrale Lille, University Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.

The eradication of viral infections is an ongoing challenge in the medical field, as currently evidenced with the newly emerged Coronavirus disease 2019 (COVID-19) associated with severe respiratory distress. As treatments are often not available, early detection of an eventual infection and its level becomes of outmost importance. Nanomaterials and nanotechnological approaches are increasingly used in the field of viral sensing to address issues related to signal-to-noise ratio, limiting the sensitivity of the sensor. Read More

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Magneto-plasmonic nanostars for image-guided and NIR-triggered drug delivery.

Sci Rep 2020 06 22;10(1):10115. Epub 2020 Jun 22.

Department of Immunology and Nano-Medicine, Institute of NeuroImmune Pharmacology, Centre for Personalized Nanomedicine, Herbert Wertheim College of Medicine, Florida International University, Miami, Florida, 33199, USA.

Smart multifunctional nanoparticles with magnetic and plasmonic properties assembled on a single nanoplatform are promising for various biomedical applications. Owing to their expanding imaging and therapeutic capabilities in response to external stimuli, they have been explored for on-demand drug delivery, image-guided drug delivery, and simultaneous diagnostic and therapeutic (i.e. Read More

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An optimal architecture of magneto-plasmonic core-shell nanoparticles for potential photothermal applications.

Phys Chem Chem Phys 2020 Jul;22(25):14318-14328

Université Paris-Saclay, CNRS, ENS Paris-Saclay, CentraleSupélec, LuMIn, 91190 Gif-sur-Yvette, France.

In this work, the optical responses of Fe3O4@Au and Fe3O4@Ag are comprehensively investigated using the discrete dipole approximation. It is found that the resonance wavelength and absorption efficiency strongly depend on the composition of the core and shell, geometry of the nanoparticles, core to particle volume ratio, core radius and shell thickness. The strongest impact is due to the shell material, the shape of the nanoparticles and their combination. Read More

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Magneto-plasmonic nanoparticle mediated thermo-radiotherapy significantly affects the nonlinear optical properties of treated cancer cells.

Photodiagnosis Photodyn Ther 2020 Jun 21;30:101785. Epub 2020 Apr 21.

Medical Physics Department, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran. Electronic address:

In order to determine the level of cell damage in cancerous cells, current cytogenetic tests have limitations such as time consumption and high cost. The aim of this study was to demonstrate the ability of nonlinear refractive (NLR) index as a predictor of breast cell damage caused by magneto-plasmonic nanoparticle based thermo-radiotherapy treatments. MCF-7 breast cancer cells were subjected individually to the treatment of radiation, radio-frequency (RF) hyperthermia, and radiation + RF hyperthermia. Read More

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Near-field mechanism of the enhanced broadband magneto-optical activity of hybrid Au loaded Bi:YIG.

Nanoscale 2020 Apr;12(13):7309-7314

Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany.

We unravel the underlying near-field mechanism of the enhancement of the magneto-optical activity of bismuth-substituted yttrium iron garnet films (Bi:YIG) loaded with gold nanoparticles. The experimental results show that the embedded gold nanoparticles lead to a broadband enhancement of the magneto-optical activity with respect to the activity of the bare Bi:YIG films. Full vectorial near- and far-field simulations demonstrate that this broadband enhancement is the result of a magneto-optically enabled cross-talking of orthogonal localized plasmon resonances. Read More

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Janus Magnetic-Plasmonic Nanoparticles for Magnetically Guided and Thermally Activated Cancer Therapy.

Small 2020 03 20;16(11):e1904960. Epub 2020 Feb 20.

Laboratoire Matière et Systèmes Complexes (MSC), UMR 7057, CNRS and Université Paris Diderot, 75205, Paris cedex 13, France.

Progress of thermal tumor therapies and their translation into clinical practice are limited by insufficient nanoparticle concentration to release therapeutic heating at the tumor site after systemic administration. Herein, the use of Janus magneto-plasmonic nanoparticles, made of gold nanostars and iron oxide nanospheres, as efficient therapeutic nanoheaters whose on-site delivery can be improved by magnetic targeting, is proposed. Single and combined magneto- and photo-thermal heating properties of Janus nanoparticles render them as compelling heating elements, depending on the nanoparticle dose, magnetic lobe size, and milieu conditions. Read More

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Star-Shaped FeO-Au Core-Shell Nanoparticles: From Synthesis to SERS Application.

Nanomaterials (Basel) 2020 Feb 10;10(2). Epub 2020 Feb 10.

Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, 75013 Paris, France.

In this work, the preparation of magneto-plasmonic granular nanostructures and their evaluation as efficient substrates for magnetically assisted surface enhanced Raman spectroscopy (SERS) sensing are discussed. These nanostructures consist of star-shaped gold Au shell grown on iron oxide FeO multicores. They were prepared by seed-mediated growth of anisotropic, in shape gold nanosatellites attached to the surface of polyol-made iron oxide polycrystals. Read More

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February 2020

Spectroscopic and Microscopic Analyses of FeO/Au Nanoparticles Obtained by Laser Ablation in Water.

Nanomaterials (Basel) 2020 Jan 10;10(1). Epub 2020 Jan 10.

Institute of Complex Systems (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy.

Magneto-plasmonic nanoparticles constituted of gold and iron oxide were obtained in an aqueous environment by laser ablation of iron and gold targets in two successive steps. Gold nanoparticles are embedded in a mucilaginous matrix of iron oxide, which was identified as magnetite by both microscopic and spectroscopic analyses. The plasmonic properties of the obtained colloids, as well as their adsorption capability, were tested by surface-enhanced Raman scattering (SERS) spectroscopy using 2,2'-bipyridine as a probe molecule. Read More

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January 2020

An integrated approach for trace detection of pollutants in water using polyelectrolyte functionalized magneto-plasmonic nanosorbents.

Sci Rep 2019 12 23;9(1):19647. Epub 2019 Dec 23.

Department of Chemistry - CICECO Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.

Resistance of pathogenic micro-organisms to conventional antibiotics is an essential issue for public health. The presence of such pharmaceuticals in aquatic ecosystems has been of major concern for which remediation and ultra-sensitive monitoring methods have been proposed. A less explored strategy involves the application of multifunctional nanosorbents for the uptake and subsequent detection of vestigial contaminants. Read More

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December 2019

Chiromagnetic Plasmonic Nanoassemblies with Magnetic Field Modulated Chiral Activity.

Small 2020 01 18;16(3):e1905734. Epub 2019 Dec 18.

State Key Lab of Food Science and Technology, International Joint Research Laboratory for Biointerface and Biodetection, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China.

Chiral plasmonic nanoassemblies, which exhibit outstanding chiroptical activity in the visible or near-infrared region, are popular candidates in molecular sensing, polarized nanophotonics, and biomedical applications. Their optical chirality can be modulated by manipulating chemical molecule stimuli or replacing the building blocks. However, instead of irreversible chemical or material changes, real-time control of optical activity is desired for reversible and noninvasive physical regulating methods, which is a challenging research field. Read More

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January 2020

Magneto-Optical Characteristics of Streptavidin-Coated FeO@Au Core-Shell Nanoparticles for Potential Applications on Biomedical Assays.

Sci Rep 2019 11 11;9(1):16466. Epub 2019 Nov 11.

Institute of Nanoscience, National Chung Hsing University, Taichung, Taiwan.

Recently, gold-coated magnetic nanoparticles have drawn the interest of researchers due to their unique magneto-plasmonic characteristics. Previous research has found that the magneto-optical Faraday effect of gold-coated magnetic nanoparticles can be effectively enhanced because of the surface plasmon resonance of the gold shell. Furthermore, gold-coated magnetic nanoparticles are ideal for biomedical applications because of their high stability and biocompatibility. Read More

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November 2019

Nondestructive Characterization of Stem Cell Neurogenesis by a Magneto-Plasmonic Nanomaterial-Based Exosomal miRNA Detection.

ACS Nano 2019 08 2;13(8):8793-8803. Epub 2019 Aug 2.

Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , New Jersey 08854 , United States.

The full realization of stem cell-based treatments for neurodegenerative diseases requires precise control and characterization of stem cell fate. Herein, we report a multifunctional magneto-plasmonic nanorod (NR)-based detection platform to address the limitations associated with the current destructive characterization methods of stem cell neurogenesis. Exosomes and their inner contents have been discovered to play critical roles in cell-cell interactions and intrinsic cellular regulations and have received wide attention as next-generation biomarkers. Read More

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Electronic Structure-Dependent Surface Plasmon Resonance in Single Au-Fe Nanoalloys.

Nano Lett 2019 08 6;19(8):5754-5761. Epub 2019 Aug 6.

Department of Chemical Sciences , University of Padova , 35131 Padova , Italy.

The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, nanoalloys of noble metals, such as gold, with transition elements, such as iron, have unique properties and a number of potential applications, ranging from nanomedicine to magneto-plasmonics and plasmon-enhanced catalysis. Here, we investigate the localized surface plasmon resonance at the level of the single Au-Fe nanoparticle by applying a strategy that combines experimental measurements using near field electron energy loss spectroscopy with theoretical studies via a full wave numerical analysis and density functional theory calculations of electronic structure. Read More

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Combinatorial effects of radiofrequency hyperthermia and radiotherapy in the presence of magneto-plasmonic nanoparticles on MCF-7 breast cancer cells.

J Cell Physiol 2019 11 14;234(11):20028-20035. Epub 2019 Apr 14.

Radiation Biology Research Center, Iran University of Medical Science (IUMS), Tehran, Iran.

Here, the effects of combinatorial cancer therapy including radiotherapy (RT) and radiofrequency (RF) hyperthermia in the presence of gold-coated iron oxide nanoparticles (Au@IONPs), as a thermo-radio-sensitizer, are reported. The level of cell death and the ratio of Bax/Bcl2 genes, involved in the pathway of apoptosis, were measured to evaluate the synergistic effect of Au@IONPs-mediated RF hyperthermia and RT. MCF-7 human breast adenocarcinoma cells were treated with different concentrations of Au@IONPs. Read More

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November 2019

Addressing the Influence of Localized Plasmon Resonance on the Magneto-Optical Properties of Cobalt Ferrite Nanoparticles.

J Nanosci Nanotechnol 2019 Aug;19(8):4946-4953

INSTM and Dipartimento di Chimica "U. Schiff", Università degli Studi di Firenze, 50019 Sesto Fiorentino, Italy.

The optical and magneto-optical (MO) properties of magneto-plasmonic nanocomposite films made up of a transparent polymer with a dispersion of cobalt ferrite (CFO) nanoparticles (NPs) and different concentrations of Au NPs are investigated. The volumetric concentrations of CFO and Au NPs, around 3%, and below 7‰ respectively, are below the percolation limit, and hence the nanocom-posite films constitute models for investigating the influence of the electromagnetic field generated at the surface plasmon resonance of Au NPs on the magneto-optical properties of CFO NPs. The plasmon resonance is present in these magneto-plasmonic composites, red-shifted with respect to the bare Au NPs and covering the spectral region where charge-transfer and crystal field MO transitions can be excited. Read More

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Recent insights in magnetic hyperthermia: From the "hot-spot" effect for local delivery to combined magneto-photo-thermia using magneto-plasmonic hybrids.

Adv Drug Deliv Rev 2019 01 7;138:233-246. Epub 2018 Nov 7.

Sorbonne Université, CNRS, PHysico-chimie des Electrolytes et Nanosystèmes InterfaciauX, PHENIX, F-75005 Paris, France. Electronic address:

Magnetic hyperthermia which exploits the heat generated by magnetic nanoparticles (MNPs) when exposed to an alternative magnetic field (AMF) is now in clinical trials for the treatment of cancers. However, this thermal therapy requires a high amount of MNPs in the tumor to be efficient. On the contrary the hot spot local effect refers to the use of specific temperature profile at the vicinity of nanoparticles for heating with minor to no long-range effect. Read More

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January 2019

Plasmon induced magneto-optical enhancement in metallic Ag/FeCo core/shell nanoparticles synthesized by colloidal chemistry.

Nanoscale 2018 Oct 28;10(39):18672-18679. Epub 2018 Sep 28.

CIC nanoGUNE, E-20018 Donostia - San Sebastian, Spain.

The combination of magnetic and plasmonic materials and their nanostructurization have revealed a prominent pathway to develop novel photonic materials for the active control of the light polarization using a magnetic field. Until now, physical growth methods have been the only exploitable approach to prepare these types of nanostructures. Here, we demonstrate the chemical synthesis of magneto-plasmonic core/shell nanocrystals with enhanced magnetic control of optical properties comparable to the best results reported for nanostructure growth by physical methods. Read More

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October 2018

Hybrid nanoparticles for magnetic and plasmonic hyperthermia.

Phys Chem Chem Phys 2018 Sep;20(37):24065-24073

Instituto de Magnetismo Aplicado, 'Salvador Velayos', UCM-CSIC-ADIF, Las Rozas, PO Box 155, Madrid 28230, Spain.

The present manuscript reports the use of hybrid magneto-plasmonic nanoparticles (HMPNPs) based on iron oxide nanoparticles and Au nanorods as colloidal nanoheaters. The individual synthesis of the magnetic and plasmonic components allowed optimizing their features for heating performance separately, before they were hybridized. Besides, a detailed characterization and finite element simulations were carried out to explain the interaction effects observed between the phases of the HMPNPs. Read More

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September 2018

Remote Trice Light, Temperature, and pH-actuation of Switchable Magneto-Plasmonic Nanocarriers for Combinational Photothermal and Controlled/Targeted Chemotherapies.

J Pharm Sci 2018 12 5;107(12):3123-3133. Epub 2018 Sep 5.

Department of Physics, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Iran. Electronic address:

Three magneto-plasmonic nanohybrids were synthesized using Au- and Ag-coated FeO nanoparticles (NPs)-modified dual pH- and temperature-responsive triblock copolymer of poly (butyl methacrylate-co-acrylamide-co-methacrylic acid) to serve as drug carriers with potential of using in both photothermal and controlled/targeted chemotherapies. The internal superparamagnetic core gives the carriers targeted-delivery characteristics, and surface plasmon resonance-based noble metallic Au/Ag shells give them on-demand photothermal and photo-triggering release properties. To investigate the effect of coating method on the targeting property of synthesized carriers, Au NPs were attached to the magnetic core by 2 different direct/indirect procedures and the properties of the synthesized carriers including swelling ratio and thermal and optical sensitivity and switching were comprehensively investigated in 2 different buffer solutions with pH 5. Read More

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December 2018

Chiral zirconium quantum dots: A new class of nanocrystals for optical detection of coronavirus.

Heliyon 2018 Aug 31;4(8):e00766. Epub 2018 Aug 31.

BioNano Laboratory, School of Engineering, University of Guelph, Guelph, Ontario N1G 2W1, Canada.

A synthetic way of chiral zirconium quantum dots (Zr QDs) was presented for the first time using L(+)-ascorbic acid acts as a surface as well as chiral ligands. Different spectroscopic and microscopic analysis was performed for thorough characterization of Zr QDs. As-synthesized QDs exhibited fluorescence and circular dichroism properties, and the peaks were located at 412 nm and 352 nm, respectively. Read More

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Magneto-Optical properties of noble-metal nanostructures: functional nanomaterials for bio sensing.

Sci Rep 2018 08 23;8(1):12640. Epub 2018 Aug 23.

Istituto per la Microelettronica e i Microsistemi IMM sezione di Lecce, Via per Arnesano, 73100, Lecce, Italy.

Metallic nanostructures supporting Localized Surface Plasmon Resonances (LSPR) are characterized by their unique ability to control and manipulate light at the nanoscale. Noble metal nanostructures, such as gold nanostructures, are demonstrating to exhibit magneto-optic activity in the presence of modulated magnetic field of low intensity in transversal configuration (T-MOKE). Validation of experimental findings was achieved by numerical simulations based on Finite Element Method (FEM) techniques. Read More

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Peptide functionalized magneto-plasmonic nanoparticles obtained by microfluidics for inhibition of β-amyloid aggregation.

J Mater Chem B 2018 Aug 25;6(31):5091-5099. Epub 2018 Jul 25.

Programa Institucional de Fomento a la I + D + i, Universidad Tecnológica Metropolitana, Ignacio Valdivieso 2409, San Joaquín, Santiago, Chile.

In the present work, we report on the synthesis of peptide functionalized magneto-plasmonic nanoparticles in a simple microfluidic platform. Superparamagnetic nanoparticles and gold nanorods were selected for this study. Magnetic nanoparticles were functionalized with peptide D1, which can bind selectively to toxic aggregates of the β-amyloid peptide associated with Alzheimer's disease. Read More

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Colloidal Binary Supracrystals with Tunable Structural Lattices.

J Am Chem Soc 2018 07 12;140(29):9095-9098. Epub 2018 Jul 12.

Department of Physics and Center for Nanophysics and Advanced Materials , University of Maryland , College Park , Maryland 20742 , United States.

Colloidal binary supracrystals (SCs) possessing tunable and ordered assembly of two different types of functional nanoparticles (NPs) represent a unique class of artificial materials for both fundamental study and technological applications, but related study has been limited due to substantial challenges in materials growth. Here we report the controlled growth of colloidal binary SCs consisting of Au and FeO NPs via an oil-in-water emulsion process. The size, stoichiometry, and lattice structure of the SCs can be broadly tuned by the growth parameters. Read More

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Synthesis of hybrid magneto-plasmonic nanoparticles with potential use in photoacoustic detection of circulating tumor cells.

Mikrochim Acta 2018 01 25;185(2):130. Epub 2018 Jan 25.

Instituto de Magnetismo Aplicado, 'Salvador Velayos', UCM-CSIC-ADIF, Las Rozas, PO Box 155, 28230, Madrid, Spain.

This article describes a novel synthetic route to obtain hybrid nanostructures that combine the plasmonic properties of gold nanorods with the magnetic properties of iron oxide nanoparticles in a robust silica nanostructure. The silica matrix enhances the physico-chemical stability of the nanostructure and preserves its magneto-plasmonic properties by avoiding the interface between gold and iron oxide. In addition, the magneto-plasmonic features of the nanohybrids can be tuned due to the independent synthesis of each component. Read More

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January 2018

Safe core-satellite magneto-plasmonic nanostructures for efficient targeting and photothermal treatment of tumor cells.

Nanoscale 2018 Jan;10(3):976-984

Department of Chemical Sciences, University of Padova, Via Marzolo 1, 31033, Padova, Italy.

Magneto-plasmonic nanostructures functionalized with cell targeting units are of great interest for nanobiotechnology applications. Photothermal treatment of cells targeted with antibody functionalized nanostructures and followed by magnetic isolation, allows killing selected cells and hence is one of the applications of great interest. The magneto-plasmonic nanostructures reported herein were synthesized using naked gold and magnetite nanoparticles obtained through a green approach based on laser ablation of bulk materials in water. Read More

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January 2018

Magneto-plasmonic Au-Coated Co nanoparticles synthesized via hot-injection method.

Nanotechnology 2018 Feb;29(6):065604

Instituto de Química de São Carlos, Universidade de São Paulo-USP, Colloidal Materials Group, CP 780, 13566-590, São Carlos-SP, Brazil.

A synthetic procedure is described for the obtaining of superparamagnetic Co nanoparticles (NPs) via hot-injection method in the presence of sodium borohydride. The Co NPs obtained have an average diameter of 5.3 nm and saturation magnetization of 115 emu g. Read More

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February 2018