Recent progress on synthesis of ceramics core/shell nanostructures

Srdić, Vladimir V.; Mojić, Bojana; Nikolić, Milutin; Ognjanović, Stevan

doi:10.2298/pac1302045s

Cited by 65 publications

(38 citation statements)

References 90 publications

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“…In the case of semiconductor/semiconductor or (oxyde or metal) magnetic/magnetic core/shell nanocrystals, shell growth is mainly carried out in the same high boiling point organic solvents as for the core synthesis following a seed-mediated growth approach [14,21,22]. After the core synthesis, the shell precursors are generally slowly added or fully added with a controlled amount in order to avoid homogeneous nucleation of the shell mate- [23,24,25].…”

Section: The Stöber Methods Relies On the Addition Of Tetraethoxysilanmentioning

confidence: 99%

Engineered inorganic core/shell nanoparticles

et al. 2014

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It has been for a long time recognized that nanoparticles are of great scientific interest as they are effectively a bridge between bulk materials and atomic structures. At first, size effects occurring in single elements have been studied. More recently, progress in chemical and physical synthesis routes permitted the preparation of more complex structures. Such structures take advantages of new adjustable parameters including stoichiometry, chemical ordering, shape and segregation opening new fields with tailored materials for biology, mechanics, optics magnetism, chemistry catalysis, solar cells and microelectronics. Among them, core/shell structures are a particular class of nanoparticles made with an inorganic core and one or several inorganic shell layer(s). In earlier work, the shell was merely used as a protective coating for the core. More recently, it has been shown that it is possible to tune the physical properties in a larger range than that of each material taken separately. The goal of the present review is to discuss the basic properties of the different types of core/shell nanoparticles including a large variety of heterostructures. We restrict ourselves on all inorganic (on inorganic/inorganic) core/shell structures. In the light of recent developments, the applications of inorganic core/shell particles are found in many fields including biology, chemistry, physics and engineering. In addition to a representative overview 2 of the properties, general concepts based on solid state physics are considered for material selection and for identifying criteria linking the core/shell structure and its resulting properties. Chemical and physical routes for the synthesis and specific methods for the study of core/shell nanoparticle are briefly discussed.

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Section: The Stöber Methods Relies On the Addition Of Tetraethoxysilanmentioning

confidence: 99%

Engineered inorganic core/shell nanoparticles

et al. 2014

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Section: Motivation and Backgroundmentioning

confidence: 99%

“…Preserving the core material's properties and modifying the surface with another material multiplies properties and, owing to the core/shell interface, superior performance has been introduced to a system that cannot be achieved by a single constituent. In recent studies, it was seen that thin surface layers on fine particles affect various properties substantially, such as chemical and thermal stability [3], catalytic activity [4], optical, magnetic, and electrical properties [5][6][7][8].Among various combinations of materials that have been utilized as core-shell systems this study targets on inorganic-inorganic group of Ag/TiO 2 and Au/TiO 2 . TiO 2 is proposed as a core material due to its inertness, chemical stability, and non-toxic nature [9].…”

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confidence: 99%

Structure and Formation Model of Ag/TiO2 and Au/TiO2 Nanoparticles Synthesized through Ultrasonic Spray Pyrolysis

Alkan

Rudolf

Bogovic

et al. 2017

Metals

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This article explains the mechanism of the metal/oxide core-shell Ag/TiO 2 and Au/TiO 2 nanoparticle formation via one-step ultrasonic spray pyrolysis (USP) by establishing a new model. The general knowledge on the standard "droplet-to-particle" (DTP) mechanism, nucleation, and growth processes of noble metals, as well as physical and chemical properties of core and shell materials and experimental knowledge, were utilized with the purpose of the construction of this new model. This hypothesis was assessed on silver (Ag)/titanium oxide (TiO 2 ) and gold (Au) TiO 2 binary complex nanoparticles' experimental findings revealed by scanning electron microscopy (SEM), focused ion beam (FIB), high-resolution transmission electron microscopy (HRTEM), and simulation of crystal lattices. It was seen that two mechanisms run as proposed in the new model. However, there were some variations in size, morphology, and distribution of Ag and Au through the TiO 2 core particle and these variations could be explained by the inherent physical and chemical property differences of Ag and Au.Keywords: ultrasonic spray pyrolysis; core shell nanostructure; formation mechanism; TiO 2 ; Ag; Au Motivation and BackgroundCore shell complex nanostructures comprised of binary systems have been the focus of great interest due to their high functionality [1,2]. Preserving the core material's properties and modifying the surface with another material multiplies properties and, owing to the core/shell interface, superior performance has been introduced to a system that cannot be achieved by a single constituent. In recent studies, it was seen that thin surface layers on fine particles affect various properties substantially, such as chemical and thermal stability [3], catalytic activity [4], optical, magnetic, and electrical properties [5][6][7][8].Among various combinations of materials that have been utilized as core-shell systems this study targets on inorganic-inorganic group of Ag/TiO 2 and Au/TiO 2 . TiO 2 is proposed as a core material due to its inertness, chemical stability, and non-toxic nature [9]. It is a crystalline material with three polymorphic phases; anatase (tetragonal), rutile (tetragonal), brookite (orthorhombic), with an order of enthalpy of formation as; ∆H f (rutile) < ∆H f (brookite) < ∆H f (anatase) [10,11]. Regarding the energetics of three polymorphs, rutile is the most stable phase, thermodynamically. However, these three compounds have a surface energy order as; Abstract: This article explains the mechanism of the metal/oxide core-shell Ag/TiO2 and Au/TiO2 nanoparticle formation via one-step ultrasonic spray pyrolysis (USP) by establishing a new model. The general knowledge on the standard "droplet-to-particle" (DTP) mechanism, nucleation, and growth processes of noble metals, as well as physical and chemical properties of core and shell materials and experimental knowledge, were utilized with the purpose of the construction of this new model. This hypothesis was assessed on silver (Ag)/titanium oxide (TiO2)...

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“…Interestingly, the advances in synthetic chemistry allowing the extraordinary control of the growth parameters has led to the development of more advanced magnetic nanoparticles comprising two (or more) materials such as core/shell particles [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. These types of multiphase nanostructures can combine the different functionalities (e.g., catalytical, optical, magnetic or biomedical) of the diverse constituents bringing about novel and enhanced properties which are resulting in innovative applications of magnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

et al. 2015

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A B S T R A C TThe applications of exchange coupled bi-magnetic hard/soft and soft/hard ferromagnetic core/shell nanoparticles are reviewed. After a brief description of the main synthesis approaches and the core/shell structural-morphological characterization, the basic static and dynamic magnetic properties are presented. Five different types of prospective applications, based on diverse patents and research articles, are described: permanent magnets, recording media, microwave absorption, biomedical applications and other applications. Both the advantages of the core/shell morphology and some of the remaining challenges are discussed.

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Recent progress on synthesis of ceramics core/shell nanostructures

Cited by 65 publications

References 90 publications

Engineered inorganic core/shell nanoparticles

Engineered inorganic core/shell nanoparticles

Structure and Formation Model of Ag/TiO2 and Au/TiO2 Nanoparticles Synthesized through Ultrasonic Spray Pyrolysis

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

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