Structure and mechanism of the formation of core–shell nanoparticles obtained through a one-step gas-phase synthesis by electron beam evaporation

Nomoev, A. V.; Бардаханов, С. П.; Schreiber, Makoto; Bazarova, Dashima G.; Романов, Н. А.; Балданов, Б. Б.; Radnaev, Bair R.; Syzrantsev, Viacheslav V.

doi:10.3762/bjnano.6.89

Cited by 66 publications

(35 citation statements)

References 20 publications

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“…Previous reports [27,34,36] utilizing relative concentrations and solubilities of constituents revealed that the basic ttheory in our formation model is compatible with other techniques, such as flame spay pyrolysis and electron beam evaporation, and also to other materials' systems like bimetallic core shells. This indicates that, considering specific reaction parameters for other techniques and material properties, this model can be adjusted for other methods and materials for effective core-shell synthesis.…”

Section: Formation Model and Validationsupporting

confidence: 55%

“…Well dispersed fine Au particles on the surface of both oxides was achieved with this method. Another study performed by Nomoev et al [34] aiming to get Ag/Si core shell nanoparticles via one-step gas phase synthesis by electron beam evaporation also revealed the importance of concentration adjustment. Formation of the core shell structure was only achieved with an optimum Si/Ag ratio.…”

Section: Formation Model and Validationmentioning

confidence: 99%

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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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Section: Formation Model and Validationsupporting

confidence: 55%

Section: Formation Model and Validationmentioning

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

View full text Add to dashboard Cite

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“…In the last few decades, core-shell type nanostructures have been of interest due to their unique properties. These structures belong to the biphasic materials consisting of an inner core structure and an outer shell, which both can either be an organic polymer [ 1 , 2 ] or an inorganic compound such as: TiO 2 or SiO 2 [ 3 ]. The core-shell nanostructures have been invented due to the extraordinary properties of the shell material, which can improve the reactivity, thermal stability, or oxidative stability of the core structure.…”

Section: Introductionmentioning

confidence: 99%

Dansyl-Labelled Ag@SiO2 Core-Shell Nanostructures—Synthesis, Characterization, and Metal-Enhanced Fluorescence

et al. 2020

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The present work describes synthesis, characterization, and use of a new dansyl-labelled Ag@SiO2 nanocomposite as an element of a new plasmonic platform to enhance the fluorescence intensity. Keeping in mind that typical surface plasmon resonance (SPR) characteristics of silver nanoparticles coincide well enough with the absorption of dansyl molecules, we used them to build the core of the nanocomposite. Moreover, we utilized 10 nm amino-functionalized silica shell as a separator between silver nanoparticles and the dansyl dye to prevent the dye-to-metal energy transfer. The dansyl group was incorporated into Ag@SiO2 core-shell nanostructures by the reaction of aminopropyltrimethoxysilane with dansyl chloride and we characterized the new dansyl-labelled Ag@SiO2 nanocomposite using transmission electron microscopy (TEM) and Fourier-transform infrared spectroscopy (FTIR). Additionally, water wettability measurements (WWM) were carried out to assess the hydrophobicity and hydrophilicity of the studied surface. We found that the nanocomposite deposited on a semitransparent silver mirror strongly increased the fluorescence intensity of dansyl dye (about 87-fold) compared with the control sample on the glass, proving that the system is a perfect candidate for a sensitive plasmonic platform.

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“…This arrangement proposes that the concentration ratios of the two components govern whether a core-shell microstructure is formed, or whether the core particle becomes decorated with smaller nanoparticles. The importance of optimal concentration ratios for producing core-shell structures is also demonstrated with the synthesis of such structures of Ag/Si [77].…”

Section: Metal/oxide Nanoparticles' Formation Modelmentioning

confidence: 97%

Advances in Ultrasonic Spray Pyrolysis Processing of Noble Metal Nanoparticles—Review

Majerič

Rudolf

2020

Materials

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In the field of synthesis and processing of noble metal nanoparticles, the study of the bottom-up method, called Ultrasonic Spray Pyrolysis (USP), is becoming increasingly important. This review analyses briefly the features of USP, to underline the physical, chemical and technological characteristics for producing nanoparticles and nanoparticle composites with Au and Ag. The main aim is to understand USP parameters, which are responsible for nanoparticle formation. There are two nanoparticle formation mechanisms in USP: Droplet-To-Particle (DTP) and Gas-To-Particle (GTP). This review shows how the USP process is able to produce Au, Ag/TiO2, Au/TiO2, Au/Fe2O3 and Ag/(Y0.95 Eu0.05)2O3 nanoparticles, and presents the mechanisms of formation for a particular type of nanoparticle. Namely, the presented Au and Ag nanoparticles are intended for use in nanomedicine, sensing applications, electrochemical devices and catalysis, in order to benefit from their properties, which cannot be achieved with identical bulk materials. The development of new noble metal nanoparticles with USP is a constant goal in Nanotechnology, with the objective to obtain increasingly predictable final properties of nanoparticles.

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Structure and mechanism of the formation of core–shell nanoparticles obtained through a one-step gas-phase synthesis by electron beam evaporation

Cited by 66 publications

References 20 publications

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

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

Dansyl-Labelled Ag@SiO2 Core-Shell Nanostructures—Synthesis, Characterization, and Metal-Enhanced Fluorescence

Advances in Ultrasonic Spray Pyrolysis Processing of Noble Metal Nanoparticles—Review

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