Impact of the capping agent removal from Au NPs@MOF core-shell nanoparticles heterogeneous catalysts

2022 ◽  
Author(s):  
Shan Dai ◽  
Kieu Phung Ngoc ◽  
Laurence Grimaud ◽  
Sanjun Zhang ◽  
Antoine Tissot ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Heterogeneous Catalysts ◽  
Synergistic Effects ◽  
Core Shell ◽  
Capping Agent ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Capping Agents ◽  
Core Shell Nanoparticles

Metal nanoparticles encased in a MOF shell have shown remarkable properties in catalysis due to potential synergistic effects. However, capping agents, commonly used to prepare these nanoparticles, lower their reactivity...

scholarly journals Core–shell Pd–P@Pt–Ni nanoparticles with enhanced activity and durability as anode electrocatalyst for methanol oxidation reaction

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 2246-2252
Author(s):  
Jiangbin Guo ◽  
Man Zhang ◽  
Jing Xu ◽  
Jun Fang ◽  
Shuiyuan Luo ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Synergistic Effects ◽  
Methanol Oxidation Reaction ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Shell Nanoparticles ◽  
The Core ◽  
Core Shell Nanoparticles ◽  
Nickel Species ◽  
Low Crystalline

The Pd–P@Pt–Ni core–shell nanoparticles consist of an amorphous core and a low-crystalline shell. They exhibit the excellent catalytic properties in MOR owing to the double synergistic effects from the core and the nickel species in the shell.

Aptamer based surface enhanced Raman scattering detection of adenosine using various core sizes of Au–Ag core–shell nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (50) ◽  
pp. 26251-26257 ◽  
Author(s):  
Fu-Hsiang Ko ◽  
Yu-Cheng Chang
Keyword(s):  
Raman Scattering ◽  
Core Shell ◽  
Silicon Substrates ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Core Shell Nanoparticles ◽  
Growth Approach

The combination of the varied sizes of Au NPs and seeding growth approach can be exploited to control the sizes of Au–Ag core–shell NPs. The silicon substrates with self-assembled Au–Ag core–shell NPs can be used to detect adenosine by a structures-switch aptamer.

scholarly journals One Pot Synthesis of Au_ZnO Core-Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

2018 ◽  
Vol 2018 (43) ◽  
pp. 4659-4659 ◽  
Author(s):  
Annalinda Contino ◽  
Giuseppe Maccarrone ◽  
Luca Spitaleri ◽  
Lucia Torrisi ◽  
Giuseppe Nicotra ◽  
...  
Keyword(s):  
Reducing Agent ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Au Nps ◽  
One Pot Synthesis ◽  
Core Shell Nanoparticles

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.

One Pot Synthesis of Au_ZnO Core-Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

2018 ◽  
Vol 2018 (43) ◽  
pp. 4678-4683 ◽  
Author(s):  
Annalinda Contino ◽  
Giuseppe Maccarrone ◽  
Luca Spitaleri ◽  
Lucia Torrisi ◽  
Giuseppe Nicotra ◽  
...  
Keyword(s):  
Reducing Agent ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Au Nps ◽  
One Pot Synthesis ◽  
Core Shell Nanoparticles

The Ag shell thickness effect of Au@Ag@SiO2 core–shell nanoparticles on the optoelectronic performance of dye sensitized solar cells

2016 ◽  
Vol 52 (11) ◽  
pp. 2390-2393 ◽  
Author(s):  
Yang Wang ◽  
Jin Zhai ◽  
Yanlin Song ◽  
Ling He
Keyword(s):  
Shell Thickness ◽  
Dye Sensitized Solar Cells ◽  
Thickness Effect ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Color Changes ◽  
Dye Sensitized ◽  
Core Shell Nanoparticles ◽  
Sensitized Solar Cells

The LSPR effect of Au@Ag@SiO2 core–shell–ultra-thin shell nanoparticles is finely tailored and tuned by varying the Ag shell thickness. The growth of silver shell onto Au NPs led to color changes from different tones of red to orange.

scholarly journals Abstract P-8:Fe2O3-SiO2-Au Core-Shell Nanoparticles for Theranostics

2021 ◽  
Vol 11 (Suppl_1) ◽  
pp. S14-S14
Author(s):  
Vadim Samardak ◽  
Mukhamad Sobirov ◽  
Aleksei Ognev ◽  
Alexander Samardak ◽  
Thomas Koo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Magnetic Measurements ◽  
Sol Gel ◽  
Magnetic Core ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Two Samples ◽  
Core Shell Nanoparticles

Background: Core-shell nanoparticles (NPs) Fe3O4-SiO2 covered with Au grains due to their unique magnetic, biological, optical and mechanical properties are promising nanostructured material especially in biomedical field. Magnetic core allows controlling the position of NPs, SiO2 shell makes them biocompatible and decrease magnetostatic interactions between them, and Au NPs on the surface allow creating additional matrix around them and using such systems as controlled nanocontainers in tasks of drug delivery, magnetic resonance imaging and target cancer cell therapy. Methods: Inner magnetic core of the NPs was synthesized using polyol method, a 3-step process which resulting in magnetite NPs with hydrophilic surface. Shell was made by covering Fe3O4 particles in surfactant and growing SiO2 on top of them by sol-gel method. Covering core-shell NPs with 3.5 nm Au seed grains using monosilane and their further growth to control diameter. Structural properties were studied using TEM and Dual Beam SEM. Magnetic properties were investigated using LakeShore VSM 7400 magnetometer. Results: Two samples with different concentration of Au NPs were investigated. SEM observations show that core-shell Fe3O4-SiO2 are spherical with average diameter of 200 nm and Au NPs with diameter of 15 nm are evenly dispersed on their surface. Magnetic measurements showed that different concentration of Au NPs results in different coercive forces of the sample. Decreasing the temperature to 77 K showed up to 6 times increase of coercive force and slight increase in magnetization. Conclusion: Biocompatible magnetic nanoparticles are critical advances in biomedical applications. In this work, we studied the morphology of the samples, demonstrated the change of coercive force of NPs with different Au concentration and investigated their magnetic properties in low temperatures.

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