Reductant-free synthesis of magnetoplasmonic iron oxide-gold nanoparticles

Miola, Marta; Ferraris, Sara; Pirani, Federica; Multari, Cristina; Bertone, Elisa; Rožman, Kristina Žužek; Kostevšek, Nina; Verné, Enrica

doi:10.1016/j.ceramint.2017.08.063

Cited by 21 publications

(21 citation statements)

References 62 publications

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“…Iron oxide based magnetic nanoparticles (IONPs) have received remarkable attention in a wide range of applications because of their unique physicochemical properties inherent to the nanoscale. Small size, high surface area, quantum confinement, and novel magnetic and optical effects open up new fields for application of iron oxides [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The IONPs show ability for the biomedical application; they need to possess suitable core size and monodispersity, acceptable hydrodynamic diameter, high saturation magnetization (Ms), high stability in biological fluid media, to be biocompatible and degradable with reduced toxicity over a large time scale, capable of clearance from the body post imaging [1][2][3][4][5][6][7]9,11]. Critical requirements for biomedical related fields are good values of magnetization and ability to form stable aqueous dispersions.…”

Section: Introductionmentioning

confidence: 99%

“…There are several established SPIONs synthesis methods, including co-precipitation, microemulsion, sol-gel, hydrothermal and thermal decomposition [2,[7][8][9][12][13][14][15][16]18,20,22,24,25,[28][29][30], each of those displaying advantages as well as drawbacks.…”

Section: Introductionmentioning

confidence: 99%

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One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

et al. 2020

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Iron oxide nanoparticles have received remarkable attention in different applications. For biomedical applications, they need to possess suitable core size, acceptable hydrodynamic diameter, high saturation magnetization, and reduced toxicity. Our aim is to control the synthesis parameters of nanostructured iron oxides in order to obtain magnetite nanoparticles in a single step, in environmentally friendly conditions, under inert gas atmosphere. The physical–chemical, structural, magnetic, and biocompatible properties of magnetite prepared by hydrothermal method in different temperature and pressure conditions have been explored. Magnetite formation has been proved by Fourier-transform infrared spectroscopy and X-ray diffraction characterization. It has been found that crystallite size increases with pressure and temperature increase, while hydrodynamic diameter is influenced by temperature. Magnetic measurements indicated that the magnetic core of particles synthesized at high temperature is larger, in accordance with the crystallite size analysis. Particles synthesized at 100 °C have nearly identical magnetic moments, at 20 × 103 μB, corresponding to magnetic cores of 10–11 nm, while the particles synthesized at 200 °C show slightly higher magnetic moments (25 × 103 μB) and larger magnetic cores (13 nm). Viability test results revealed that the particles show only minor intrinsic toxicity, meaning that these particles could be suited for biomedical applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

et al. 2020

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“…Aggregation of nanoparticles should be avoided to prevent blockage of blood vessels. In addition, the particles' stability in water at neutral pH is very important for these applications and the colloidal stability of the magnetic fluid depends on the coating materials and the particle size [24,25]. Magnetic iron oxide nanoparticles with polymer coatings have also been used in cell separation, protein purification and organic or biochemical syntheses [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

et al. 2020

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Magnetic iron oxides have been used in biomedical applications, such as contrast agents for magnetic resonance imaging, carriers for controlled drug delivery and immunoassays, or magnetic hyperthermia for the past 40 years. Our aim is to investigate the effect of pressure and temperature on the structural, thermal, and magnetic properties of iron oxides prepared by hydrothermal synthesis at temperatures of 100–200 °C and pressures of 20–1000 bar. It has been found that pressure influences the type of iron oxide crystalline phase. Thus, the results obtained by Mössbauer characterization are in excellent agreement with X-ray diffraction and optical microscopy characterization, showing that, for lower pressure values (<100 bar), hematite is formed, while, at pressures >100 bar, the major crystalline phase is goethite. In addition, thermal analysis results are consistent with particle size analysis by X-ray diffraction, confirming the crystallization of the synthesized iron oxides. One order of magnitude higher magnetization has been obtained for sample synthesized at 1000 bar. The same sample provides after annealing treatment, the highest amount of good quality magnetite leading to a magnetization at saturation of 30 emu/g and a coercive field of 1000 Oe at 10 K and 450 Oe at 300 K, convenient for various applications.

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“…27,28 Colloidal GNPs were synthesized by reduction of soluble gold salt (HAuCl 4 ): 4 ml of HAuCl 4 (12.7 mM) was prepared, and the pH of the solution was adjusted at about 8 by adding NaOH 0.1 M, to allow the formation of gold hydroxide suspension (Au(OH) 3 ). 22 Subsequently, M-A-Au NPs were developed by grafting Au(OH) 3 colloidal seeds to the surface of M-A NPs and promoting their reduction to GNPs by using or not TAas reducing agent.…”

Section: Synthesis Of Magnetite-gold Magneto-plasmonic Heterodimer (M-a-au)mentioning

confidence: 99%

Magneto‐plasmonic heterodimers: Evaluation of different synthesis approaches

et al. 2021

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Nanomedicine has gained huge attention in recent years with new approaches in medical diagnosis and therapy. Particular consideration has been devoted to the nanoparticles (NPs) in theranostic field with specific interest for magnetic and gold NPs (MNPs and GNPs) due to their peculiar properties under exposition to electromagnetic fields. In this paper, we aim to develop magneto-plasmonic heterodimer by combining MNPs and GNPs through a facile and reproducible synthesis and to investigate the influence of different synthesis parameters on their response to magnetic and optical stimuli. In particular, various syntheses were performed by changing the functionalization step and using or not a reducing agent to obtain stable NP suspensions with tailored properties. The obtained heterodimers were characterized through physical, chemical, optical, and magnetic analysis, in order to evaluate their size, shape, plasmonic properties, and superparamagnetic behavior. The results revealed that the shape and dimensions of the nanocomposites can be tuned by MNPs surface functionalization, as well as by the use of a reducing agent, giving rise to nanoplatform suitable for biomedical application, exploiting the gold absorbing peak in the specific gold absorbing range of GNPs, while maintaining the superparamagnetic behavior typical of the MNPs. The obtained nanocomposites can be proposed as potential candidates for cancer theranostics.

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Reductant-free synthesis of magnetoplasmonic iron oxide-gold nanoparticles

Cited by 21 publications

References 62 publications

One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

Magneto‐plasmonic heterodimers: Evaluation of different synthesis approaches

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