scholarly journals Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7294
Author(s):  
Yunjeong Hwang ◽  
Naechul Shin
Keyword(s):  
Transition Metal Dichalcogenides ◽  
Secondary Growth ◽  
Electrochemical Analysis ◽  
Colloidal Synthesis ◽  
Growth Time ◽  
Core Shell ◽  
The Core ◽  
Electrochemical Applications ◽  
Synthetic Temperature ◽  
Metal Dichalcogenides

The ability to control the active edge sites of transition metal dichalcogenides (TMDs) is crucial for modulating their chemical activity for various electrochemical applications, including hydrogen evolution reactions. In this study, we demonstrate a colloidal synthetic method to prepare core-shell-like heterostructures composed of MoSe2 and WSe2 via a two-step sequential growth. By overgrowing WSe2 on the surface of preexisting MoSe2 nanosheet edges, MoSe2-core/WSe2-shell heterostructures were successfully obtained. Systematic comparisons of the secondary growth time and sequential order of growth suggest that the low synthetic temperature conditions allow the stable overgrowth of shells rich in WSe2 on top of the core of MoSe2 with low Gibbs formation energy. The electrochemical analysis confirms that the catalytic activity correlates to the core-shell composition variation. Our results propose a new strategy to control the edge site activity of TMD materials prepared by colloidal synthesis, which is applicable to diverse electrochemical applications.

scholarly journals Correction: Topology of transition metal dichalcogenides: the case of the core–shell architecture

Nanoscale ◽  
2021 ◽  
Author(s):  
Jennifer G. DiStefano ◽  
Akshay A. Murthy ◽  
Shiqiang Hao ◽  
Roberto dos Reis ◽  
Chris Wolverton ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Core Shell ◽  
The Core ◽  
Metal Dichalcogenides

Correction for ‘Topology of transition metal dichalcogenides: the case of the core–shell architecture’ by Jennifer G. DiStefano et al., Nanoscale, 2020, 12, 23897–23919, DOI: 10.1039/D0NR06660E.

Topology of transition metal dichalcogenides: the case of the core–shell architecture

Nanoscale ◽  
2020 ◽  
Vol 12 (47) ◽  
pp. 23897-23919
Author(s):  
Jennifer G. DiStefano ◽  
Akshay A. Murthy ◽  
Shiqiang Hao ◽  
Roberto dos Reis ◽  
Chris Wolverton ◽  
...  
Keyword(s):  
Transition Metal ◽  
Review Paper ◽  
Transition Metal Dichalcogenides ◽  
Material Design ◽  
Core Shell ◽  
The Core ◽  
Metal Dichalcogenides ◽  
The Rich

This review paper highlights the rich opportunities of curvature and architecture in transition metal dichalcogenides for improved material design.

Photoluminescence of Hybrid Structure Base in ZnO@SiO2 Core-Shell Nanoparticles inside Porous Silicon

2019 ◽  
Vol 286 ◽  
pp. 40-48
Author(s):  
Xairo Leon ◽  
Edith Osorio ◽  
Rene Pérez-Cuapio ◽  
Carlos Bueno ◽  
Mauricio Pacio ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Luminescent Properties ◽  
Electrolyte Solutions ◽  
Hybrid Structure ◽  
Colloidal Synthesis ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Sem Images ◽  
Mesoporous Silicon ◽  
The Core

In this work, core-shell ZnO@SiO2nanoparticles (NPs) were infiltrated into a macro/meso-porous silicon (PS) structure, to study its luminescent properties. The core-shell ZnO@SiO2NPs were obtained by colloidal synthesis. The core-shell ZnO@SiO2NP was 5 nm in diameter. The macro/meso-PS structure was made in two steps: we obtained the macroporous silicon (macro-PS) layer fist and the mesoporous silicon (meso-PS) layer second. This process was conducted using different electrolyte solutions, and the change of electrolyte led to a decrease in the special charge region over the wall macro-PS layer; this allowed the building of the meso-PS layers on the walls and the bottom of the macro-PS layer. The SEM results show the cross-section of the macro/meso-PS structure with and without core-shell ZnO@SiO2NPs. These SEM images show that the core-shell ZnO@SiO2NPs that infiltrated into macro/meso-PS structure were more efficiently bonded over all the porous walls. The core-shell ZnO@SiO2PL interacted with the macro/meso-PS structure, modifying its PL intensity and controlling a shift toward a lower wavelength.

scholarly journals Nickel platinum (NixPt1−x) nanoalloy monodisperse particles without the core–shell structure by colloidal synthesis

2020 ◽  
Vol 2 (9) ◽  
pp. 3882-3889
Author(s):  
Cora Moreira Da Silva ◽  
Armelle Girard ◽  
Maxime Dufond ◽  
Frédéric Fossard ◽  
Amandine Andrieux-Ledier ◽  
...  
Keyword(s):  
Reduction Potential ◽  
Synthesis Temperature ◽  
Colloidal Synthesis ◽  
Core Shell ◽  
Monodisperse Particles ◽  
The Core ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Core Shell Structure ◽  
Nickel Platinum

Versatile colloidal route towards the synthesis of nanoalloys with controlled size and chemical composition, based on the correlation between the oxidation–reduction potential of metal cations in the precursors and the synthesis temperature.

Effect of Process Temperature on the Growth Kinetic and Structure of Ge Nanowires Formed by Galvanostatic Electrodeposition Using in Nanoparticles

2020 ◽  
Vol 312 ◽  
pp. 80-85
Author(s):  
Ilya Gavrilin
Keyword(s):  
Growth Kinetic ◽  
Average Diameter ◽  
Solution Temperature ◽  
Growth Time ◽  
Core Shell ◽  
Germanium Nanowires ◽  
The Core ◽  
Different Temperatures ◽  
Core Shell Structure ◽  
Increasing Temperature

In this work, germanium nanowires (GeNWs) were fabricated by galvanostatic electrodeposition using In nanoparticles from water solutions at different temperatures. It was found that in the temperature range from 10°C to 60°C there was no significant change in the structure of GeNWs, and the average diameter was about 40 nm. The growth time of GeNWs increases linearly with increasing temperature of the electrolyte solution. However, the structure of GeNW obtained at a solution temperature of 90°C has changed. It was shown that these GeNWs have a core-shell structure: the core is a crystalline Ge phase containing In atoms, and the shell is Ge oxides (hydroxides).

Magnetic Properties of Fe3O4/CoFe2O4 Composite Nanoparticles with Core/Shell Architecture

2020 ◽  
Vol 65 (10) ◽  
pp. 904
Author(s):  
V. O. Zamorskyi ◽  
Ya. M. Lytvynenko ◽  
A. M. Pogorily ◽  
A. I. Tovstolytkin ◽  
S. O. Solopan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Composite Nanoparticles ◽  
Core Shell ◽  
Cofe2o4 Nanoparticles ◽  
Core Diameter ◽  
The Core ◽  
Shell Particles ◽  
Interface Parameters ◽  
Shell Composite

Magnetic properties of the sets of Fe3O4(core)/CoFe2O4(shell) composite nanoparticles with a core diameter of about 6.3 nm and various shell thicknesses (0, 1.0, and 2.5 nm), as well as the mixtures of Fe3O4 and CoFe2O4 nanoparticles taken in the ratios corresponding to the core/shell material contents in the former case, have been studied. The results of magnetic research showed that the coating of magnetic nanoparticles with a shell gives rise to the appearance of two simultaneous effects: the modification of the core/shell interface parameters and the parameter change in both the nanoparticle’s core and shell themselves. As a result, the core/shell particles acquire new characteristics that are inherent neither to Fe3O4 nor to CoFe2O4. The obtained results open the way to the optimization and adaptation of the parameters of the core/shell spinel-ferrite-based nanoparticles for their application in various technological and biomedical domains.

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