Enhanced 808 nm driven Ce3+ doped red-emitting upconversion nanocrystals by intercalated nanostructures

2016 ◽  
Vol 4 (22) ◽  
pp. 4905-4911 ◽  
Author(s):  
Ji-Wei Shen ◽  
Junliang Lu ◽  
Jun Tu ◽  
Xiangyuan Ouyang ◽  
Hua Li
Keyword(s):  
Energy Transfer ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Upconversion Nanocrystals

808 nm driven intense red-emitting upconversion nanocrystals were constructed by intercalating NaYF4:Yb/Ho/Ce, as shell, into Nd3+ sensitized nanostructures to conquer the energy transfer barrier from the Nd3+ shell to the Yb3+ core in Ce3+ doped core–shell–shell nanostructures.

scholarly journals Core-Shell Structures of Upconversion Nanocrystals Coated with Silica for Near Infrared Light Enabled Optical Imaging of Cancer Cells

Micromachines ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 400 ◽  
Author(s):  
Kumbam Lingeshwar Reddy ◽  
Neeraj Prabhakar ◽  
Jessica Rosenholm ◽  
Venkata Krishnan
Keyword(s):  
Optical Imaging ◽  
Cancer Cells ◽  
Near Infrared ◽  
Shell Structures ◽  
Therapeutic Window ◽  
Luminescence Spectroscopy ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Nir Light ◽  
Upconversion Nanocrystals

Optical imaging of cancer cells using near infrared (NIR) light is currently an active area of research, as this spectral region directly corresponds to the therapeutic window of biological tissues. Upconversion nanocrystals are photostable alternatives to conventional fluorophores. In our work, we have prepared upconversion nanocrystals of NaYF4:Yb/Er and encapsulated them in silica to form core-shell structures. The as-prepared core-shell nanostructures have been characterized for their structure, morphology, and optical properties using X-ray diffraction, transmission electron microscopy coupled with elemental mapping, and upconversion luminescence spectroscopy, respectively. The cytotoxicity examined using cell viability assay indicated a low level of toxicity of these core-shell nanostructures. Finally, these core-shell nanostructures have been utilized as photostable probes for NIR light enabled optical imaging of human breast cancer cells. This work paves the way for the development of advanced photostable, biocompatible, low-toxic core-shell nanostructures for potential optical imaging of biological cells and tissues.

Au@NaYF4:Tb3+ core@shell nanostructures: Synthesis and construction of luminescence resonance energy transfer

2016 ◽  
Vol 171 ◽  
pp. 124-130 ◽  
Author(s):  
Yan Song ◽  
Guixia Liu ◽  
Xiangting Dong ◽  
Jinxian Wang ◽  
Wensheng Yu
Keyword(s):  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Core Shell ◽  
Shell Nanostructures

scholarly journals Iron Based Core-Shell Structures as Versatile Materials: Magnetic Support and Solid Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 72
Author(s):  
Christian Zambrzycki ◽  
Runbang Shao ◽  
Archismita Misra ◽  
Carsten Streb ◽  
Ulrich Herr ◽  
...  
Keyword(s):  
Water Purification ◽  
Functional Materials ◽  
Core Material ◽  
Solid Catalyst ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Shell Nanostructures ◽  
Sio2 Shell ◽  
Iron Based

Core-shell materials are promising functional materials for fundamental research and industrial application, as their properties can be adapted for specific applications. In particular, particles featuring iron or iron oxide as core material are relevant since they combine magnetic and catalytic properties. The addition of an SiO2 shell around the core particles introduces additional design aspects, such as a pore structure and surface functionalization. Herein, we describe the synthesis and application of iron-based core-shell nanoparticles for two different fields of research that is heterogeneous catalysis and water purification. The iron-based core shell materials were characterized by transmission electron microscopy, as well as N2-physisorption, X-ray diffraction, and vibrating-sample magnetometer measurements in order to correlate their properties with the performance in the target applications. Investigations of these materials in CO2 hydrogenation and water purification show their versatility and applicability in different fields of research and application, after suitable individual functionalization of the core-shell precursor. For design and application of magnetically separable particles, the SiO2 shell is surface-functionalized with an ionic liquid in order to bind water pollutants selectively. The core requires no functionalization, as it provides suitable magnetic properties in the as-made state. For catalytic application in synthesis gas reactions, the SiO2-stabilized core nanoparticles are reductively functionalized to provide the catalytically active metallic iron sites. Therefore, Fe@SiO2 core-shell nanostructures are shown to provide platform materials for various fields of application, after a specific functionalization.

Linear diameter dependence magnetization of Fe-CoNi core-shell nanostructures

2021 ◽  
pp. 168164
Author(s):  
S. Parajuli ◽  
J.F. Feng ◽  
M. Irfan ◽  
C. Cheng ◽  
X.M. Zhang ◽  
...  
Keyword(s):  
Core Shell ◽  
Shell Nanostructures ◽  
Linear Diameter

Nonlinear optical behavior of Au@Ag core- shell nanostructures

2021 ◽  
pp. 115935
Author(s):  
E. Shiju ◽  
T. Abhijith ◽  
D. Narayana Rao ◽  
K. Chandrasekharan
Keyword(s):  
Nonlinear Optical ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Optical Behavior

Electromagnetic response of SiO2@Fe3O4 core shell nanostructures in the THz regime

2021 ◽  
pp. 1-1
Author(s):  
Arka Chaudhuri ◽  
Rupali Rakshit ◽  
Kazunori Serita ◽  
Masayoshi Tonouchi ◽  
Kalyan Mandal
Keyword(s):  
Electromagnetic Response ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Fe3o4 Core
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