Size-Dependent Strain of Sn/SnOx Core/Shell Nanoparticles

2014 ◽  
Vol 118 (51) ◽  
pp. 30238-30243 ◽  
Author(s):  
Nikolas Oehl ◽  
Peter Michalowski ◽  
Martin Knipper ◽  
Joanna Kolny-Olesiak ◽  
Thorsten Plaggenborg ◽  
...  
Keyword(s):  
Core Shell ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
Dependent Strain ◽  
Core Shell Nanoparticles

Size-dependent critical transition in the origin of light emission from core–shell Si–SiO2 nanoparticles

2020 ◽  
Vol 8 (26) ◽  
pp. 9012-9023
Author(s):  
Bruno P. Falcão ◽  
Joaquim P. Leitão ◽  
Maria R. Soares ◽  
Joana Rodrigues ◽  
Lídia Ricardo ◽  
...  
Keyword(s):  
Light Emission ◽  
Sio2 Nanoparticles ◽  
Core Shell ◽  
Critical Transition ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
The Core ◽  
Core Shell Nanoparticles ◽  
Small Nanoparticles

Here, it is established that the origin of the photoluminescence of Si–SiO2 core–shell nanoparticles is strongly size-dependent, with large nanoparticles emitting mostly from the core, whereas small nanoparticles emit predominantly from the shell.

scholarly journals The Multifunctionally Graded System for a Controlled Size Effect on Iron Oxide–Gold Based Core-Shell Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1695
Author(s):  
Bo-Wei Du ◽  
Chih-Yuan Chu ◽  
Ching-Chang Lin ◽  
Fu-Hsiang Ko
Keyword(s):  
Magnetic Field ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Size Dependent ◽  
Short Period ◽  
Frequency Magnetic Field ◽  
Delivery Platform ◽  
Core Shell Nanoparticles ◽  
Shielding Effects

We report that Fe3O4@Au core-shell nanoparticles (NPs) serve as a multifunctional molecule delivery platform. This platform is also suitable for sensing the doxorubicin (DOX) through DNA hybridization, and the amount of carried DOX molecules was determined by size-dependent Fe3O4@Au NPs. The limits of detection (LODs) for DOX was found to be 1.839 nM. In our approach, an Au nano-shell coating was coupled with a specially designed DNA sequence using thiol bonding. By means of a high-frequency magnetic field (HFMF), a high release percentage of such a molecule could be efficiently achieved in a relatively short period of time. Furthermore, the thickness increase of the Au nano-shell affords Fe3O4@Au NPs with a larger surface area and a smaller temperature increment due to shielding effects from magnetic field. The change of magnetic property may enable the developed Fe3O4@Au-dsDNA/DOX NPs to be used as future nanocarrier material. More importantly, the core-shell NP structures were demonstrated to act as a controllable and efficient factor for molecule delivery.

Preparation of fluorescent Au–SiO2 core–shell nanoparticles and nanorods with tunable silica shell thickness and surface modification for immunotargeting

2016 ◽  
Vol 4 (32) ◽  
pp. 5418-5428 ◽  
Author(s):  
Prakash D. Nallathamby ◽  
Juliane Hopf ◽  
Lisa E. Irimata ◽  
Tracie L. McGinnity ◽  
Ryan K. Roeder
Keyword(s):  
Biomedical Applications ◽  
Shell Thickness ◽  
Silica Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
Scalable Methods ◽  
Core Shell Nanoparticles ◽  
Multifunctional Properties

Scalable methods for preparing and modifying Au–SiO2 core–shell nanoparticles provide a platform for engineering size-dependent multifunctional properties for in vivo biomedical applications.

scholarly journals Size-dependent Optical Response of Magneto-plasmonic Core-shell Nanoparticles

2017 ◽  
Vol 1 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Pradeep Bhatia ◽  
Suram Singh Verma ◽  
Murari Mohan Sinha
Keyword(s):  
Optical Response ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
Core Shell Nanoparticles

Size-dependent thermal stresses in the core—shell nanoparticles

2013 ◽  
Vol 22 (12) ◽  
pp. 128102 ◽  
Author(s):  
I Astefanoaei ◽  
I Dumitru ◽  
Al Stancu
Keyword(s):  
Thermal Stresses ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
The Core ◽  
Core Shell Nanoparticles

Chemically Functional Semiconductor Nanocrystals: Electrochemistry and Self-Assembly on Surfaces

2002 ◽  
Vol 737 ◽  
Author(s):  
Benjamin M. Hutchins ◽  
Andrew H. Latham ◽  
Mary Elizabeth Williams
Keyword(s):  
Band Gap ◽  
Self Assembly ◽  
Semiconductor Nanocrystals ◽  
Band Gap Energy ◽  
Covalent Attachment ◽  
Core Shell ◽  
Metallic Surfaces ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
Core Shell Nanoparticles

ABSTRACTSemiconductor nanocrystals (i.e., Quantum Dots, QDs) exhibit size-dependent emission properties and have synthetically adjustable ligand shells, making them interesting materials for applications ranging from luminescent displays to biomolecular tags. In this paper, the electrochemical properties of two types of nanocrystal are studied with an emphasis on the effect of core/shell vs core structures. The band gap energy of CdSe particles, measured using optical spectroscopy, was shown to increase slightly with the application of a ZnSe shell, as expected based on the increased energy required to transfer an electron through the shell material. The electrochemically determined band gaps are overestimated in the case of CdSe/ZnSe core/shell nanoparticles, reflecting the band gap of the ZnSe shell. Finally, QDs were self-assembled onto gold surfaces by electrostatic and covalent attachment, and their presence confirmed by fluorescence spectroscopy. The high intensity of emitted light shows that the QDs can be self-assembly onto metallic surfaces, without energy transfer quenching of the luminescence.

Size-dependent oxidation in iron/iron oxide core-shell nanoparticles

2003 ◽  
Vol 68 (19) ◽  
Author(s):  
Luca Signorini ◽  
Luca Pasquini ◽  
Lorenzo Savini ◽  
Roberta Carboni ◽  
Federico Boscherini ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
Iron Iron ◽  
Iron Oxide Core ◽  
Core Shell Nanoparticles

scholarly journals Shell Thickness-Dependent Strain Distributions of Confined Au/Ag and Ag/Au Core-Shell Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Feng Liu ◽  
Honghua Huang ◽  
Ying Zhang ◽  
Ting Yu ◽  
Cailei Yuan ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Shell Thickness ◽  
Au Nanoparticles ◽  
Compressive Strain ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Dependent Strain ◽  
Simulation Results ◽  
Core Shell Nanoparticles

The shell thickness-dependent strain distributions of the Au/Ag and Ag/Au core-shell nanoparticles embedded in Al2O3matrix have been investigated by finite element method (FEM) calculations, respectively. The simulation results clearly indicate that there is a substantial strain applied on both the Au/Ag and Ag/Au core-shell nanoparticles by the Al2O3matrix. For the Au/Ag nanoparticles, it can be found that the compressive strain existing in the shell is stronger than that on the center of core and reaches the maximum at the interface between the shell and core. In contrast, for the Ag/Au nanoparticles, the compressive strain applied on the core is much stronger than that at the interface and that in the shell. With the shell thickness increasing, both of the strains in the Au/Ag and Ag/Au nanoparticles increase as well. However, the strain gradient in the shell decreases gradually with the increasing of the shell thickness for both of Ag/Au ad Au/Ag nanoparticles. These results provide an effective method to manipulate the strain distributions of the Au/Ag and Ag/Au nanoparticles by tuning the thickness of the shell, which can further have significant influences on the microstructures and physical properties of Au/Ag and Ag/Au nanoparticles.

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