Determining the Concentration Dependent Transformations of Ag Nanoparticles in Complex Media: Using SP-ICP-MS and Au@Ag Core–Shell Nanoparticles as Tracers

2017 ◽  
Vol 51 (6) ◽  
pp. 3206-3213 ◽  
Author(s):  
Ruth C. Merrifield ◽  
Chady Stephan ◽  
Jamie Lead
Keyword(s):  
Ag Nanoparticles ◽  
Core Shell ◽  
Complex Media ◽  
Shell Nanoparticles ◽  
Icp Ms ◽  
Core Shell Nanoparticles

β-Cyclodextrin coated SiO2@Au@Ag core–shell nanoparticles for SERS detection of PCBs

2015 ◽  
Vol 17 (33) ◽  
pp. 21149-21157 ◽  
Author(s):  
Yilin Lu ◽  
Guohua Yao ◽  
Kexi Sun ◽  
Qing Huang
Keyword(s):  
Ag Nanoparticles ◽  
Core Shell ◽  
Sers Substrate ◽  
Shell Nanoparticles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
New Type ◽  
Enhanced Raman Scattering ◽  
Core Shell Nanoparticles

A new type of surface-enhanced Raman scattering (SERS) substrate consisting of β-cyclodextrin (β-CD) coated SiO2@Au@Ag nanoparticles (SiO2@Au@Ag@CD NPs) has been achieved.

scholarly journals Seed-mediated growth of MOF-encapsulated Pd@Ag core–shell nanoparticles: toward advanced room temperature nanocatalysts

2016 ◽  
Vol 7 (1) ◽  
pp. 228-233 ◽  
Author(s):  
Liyu Chen ◽  
Binbin Huang ◽  
Xuan Qiu ◽  
Xi Wang ◽  
Rafael Luque ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Reducing Agent ◽  
Growth Strategy ◽  
Core Shell ◽  
Hydrogen Atoms ◽  
Shell Nanoparticles ◽  
Seed Mediated ◽  
Core Shell Nanoparticles

Core–shell Pd@Ag nanoparticles are formed within the pores of MOFs via a seed mediated growth strategy with activated hydrogen atoms as the reducing agent, leading to a family of bimetallic core–shell MOF nanomaterials with excelling catalytic performance in room temperature reactions.

scholarly journals Synthesis and Characterization of Silver/Titanium dioxide Core-Shell Nanoparticles

1970 ◽  
Vol 3 (1) ◽  
pp. 21-24
Author(s):  
Suk Fun Chin ◽  
Suh Cem Pang ◽  
Freda Emmanuel Idely Dom
Keyword(s):  
Photocatalytic Activity ◽  
Ag Nanoparticles ◽  
Sol Gel ◽  
Model Reaction ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Particle Sizes ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Silver nanoparticles (AgNPs) with mean diameter of 150 nm were synthesized by using an aqueous-basedreduction method. Ascorbic acid and sodium hydroxide (NaOH) were used as a reducing agent and as acatalyst, respectively. These AgNPs were subsequently coated with a layer of TiO2 to form Ag/TiO2 core-shellnanoparticles by using a sol-gel method. The particle sizes and morphology of Ag/TiO2 core-shellnanoparticles were characterized using scanning electron microscopy (SEM) and transition electronmicroscopy (TEM). The photocatalytic activity of the Ag/TiO2 core-shell nanoparticles were evaluated basedon the degradation of methylene blue (MB) as the model reaction. The TiO2 coating has resulted in theenhanced photocatalytic activity of Ag nanoparticles as compared to bare Ag nanoparticles.

An approach towards the synthesis and characterization of ZnO@Ag core@shell nanoparticles in water-in-oil microemulsion

RSC Advances ◽  
2014 ◽  
Vol 4 (39) ◽  
pp. 20612-20615 ◽  
Author(s):  
Shazia Sharmin Satter ◽  
Mahfuzul Hoque ◽  
M. Muhibur Rahman ◽  
M. Yousuf A. Mollah ◽  
Md. Abu Bin Hasan Susan
Keyword(s):  
Ag Nanoparticles ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Water-in-oil microemulsions have been found to be good templates for synthesis of ZnO and ZnO@Ag nanoparticles and offered themselves as ideal ‘nanoreactors’ for uniform fabrication of core@shell nanoparticles.

Preparation, Characterization, and Surface-Enhanced Raman Spectroscopy Activity of Spherical α-Fe2O3/Ag Core/Shell Nanoparticles

2010 ◽  
Vol 152-153 ◽  
pp. 67-72 ◽  
Author(s):  
Chun Rong Wang ◽  
Zhu Fa Zhou ◽  
Yan Jie Li ◽  
Ran Ran Tian ◽  
Xiao Chun Dai
Keyword(s):  
Ag Nanoparticles ◽  
Surface Enhanced Raman Spectroscopy ◽  
Reduction Reaction ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Shell Particles ◽  
Average Size ◽  
Core Shell Nanoparticles

Spherical α-Fe2O3/Ag core/shell nanoparticles were prepared by reducing Ag(NH3)2+ with formaldehyde using the seeding method. 3- Aminopropyltriethoxysilane (APS) acts as a “bridge” to link between α-Fe2O3 core and Ag shell. The obtained nanoparticles were characterized by XRD, TEM, SEM, EDS, and Roman. The results show thatα-Fe2O3 cores are coated by Ag shell completely. The average size of α-Fe2O3/Ag nanoparticles is 95 nm and the thicknesses of Ag shell are 15nm in 3.7% HCHO and 1.0M AgNO3. The thickness of Ag shell can be tunable by changing reaction conditions, such as the concentration of AgNO3, reduction reaction rate. The surface-enhanced Raman scattering (SERS) effect of the core/shell particles are measured with Pyridine (Py) as molecule probe. SERS indicate that the Raman signals of Py adsorbed on α-Fe2O3/Ag nanoparticles exhibit large enhancement at 1010 and 1038 cm-1 respectively. And the intensity of signals is enhanced with the increase of the thickness of Ag shell. The uniform and rough surface of α-Fe2O3/Ag particles exhibits strong SERS activity in 3.7% HCHO and 1.0M AgNO3. The spherical α-Fe2O3/Ag core/shell nanoparticles exhibit SERS activity.

Plasmon coupling-enhanced two-photon photoluminescence of Au@Ag core–shell nanoparticles and applications in the nuclease assay

Nanoscale ◽  
2015 ◽  
Vol 7 (22) ◽  
pp. 10233-10239 ◽  
Author(s):  
Peiyan Yuan ◽  
Rizhao Ma ◽  
Nengyue Gao ◽  
Monalisa Garai ◽  
Qing-Hua Xu
Keyword(s):  
Ag Nanoparticles ◽  
Plasmon Coupling ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
S1 Nuclease ◽  
Two Photon ◽  
Core Shell Nanoparticles ◽  
Nuclease Assay

Au@Ag nanoparticles were prepared to investigate composition dependent aggregation enhanced 2PPL and act as two-photon probe for S1 nuclease detection.

Green Fabrication of Hydrogel-Immobilized Au@Ag Nanoparticles Using Tannic Acid and Application in Catalysis

2021 ◽  
Author(s):  
Hengxi He ◽  
Didier Astruc ◽  
Haibin Gu
Keyword(s):  
Tannic Acid ◽  
Ag Nanoparticles ◽  
Core Shell ◽  
Step Method ◽  
Shell Nanoparticles ◽  
Active Core ◽  
Catalytically Active ◽  
One Step ◽  
Core Shell Nanoparticles

Highly catalytically active core-shell nanoparticles (NPs) have attracted great attention towards applications. Herein, core-shell Au@AgNPs were simply obtained via a green and cheap one-step method using tannic acid (TA) as...

Effect of component volume ratio on the absorption spectra of Ag@Fe3O4 core–shell nanoparticles

2019 ◽  
Vol 33 (07) ◽  
pp. 1950071
Author(s):  
Weichun Zhang ◽  
Jiyu Fan
Keyword(s):  
Electric Field ◽  
Plasmon Resonance ◽  
Ag Nanoparticles ◽  
Shell Thickness ◽  
Outer Shell ◽  
Core Shell ◽  
Core Radius ◽  
Shell Nanoparticles ◽  
Structural Variables ◽  
Core Shell Nanoparticles

In this paper, we study the absorption efficiency spectra and electric field distribution of Ag nanoparticles enveloped with [Formula: see text] nanoshell by applying the discrete dipole approximation theory. Three kinds of [Formula: see text] core–shell nanoparticles (NPs) structural variables, including the same core with different shell thickness, the same outer shell with different core radius, and the same size of total radius have been discussed in detail. The simulated results show that the localized surface plasmon resonance (LSPR) peak wavelength of NPs is linearly proportional with the volume fraction of the shell, regardless of the outer shell material property and one structural variable. Compared to the plasmon resonance peak of the Ag nanoparticles, the LSPR shift of the NPs is dependent on both the total particles size and the outer [Formula: see text] shell thickness. The electric field around the surface of NPs becomes weaker under the same damping when the core radius decreases. Based on the plasmonic characteristics revealed in this study, it is suggested that it would provide some key guidances for designing the future NPs structural variables for a broad range of plasmon applications.

Sign in / Sign up

Export Citation Format

Share Document