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.

Formation of bismuth iron oxide based core–shell structures and their dielectric, ferroelectric and magnetic properties

2019 ◽  
Vol 7 (5) ◽  
pp. 1280-1291 ◽  
Author(s):  
Alaka Panda ◽  
R. Govindaraj ◽  
R. Mythili ◽  
G. Amarendra
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Shell Structures ◽  
Core Shell ◽  
Bismuth Iron Oxide ◽  
The Core ◽  
Shell Nanostructures ◽  
Transmission Electron

Bismuth and iron oxides subjected to ball milling followed by controlled annealing treatments showed the formation of core–shell nanostructures with Bi2Fe4O9 as the core and a shell of BiFeO3 and Bi25FeO40 phases as deduced based on the analysis of transmission electron microscopy results.

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 Dye-sensitized Pt@TiO2 core–shell nanostructures for the efficient photocatalytic generation of hydrogen

2014 ◽  
Vol 5 ◽  
pp. 360-364 ◽  
Author(s):  
Jun Fang ◽  
Lisha Yin ◽  
Shaowen Cao ◽  
Yusen Liao ◽  
Can Xue
Keyword(s):  
Photocatalytic Activity ◽  
High Photocatalytic Activity ◽  
Shell Structures ◽  
Core Shell ◽  
Synergic Effect ◽  
Proton Reduction ◽  
Dye Sensitization ◽  
Dye Sensitized ◽  
Shell Nanostructures ◽  
Photogenerated Electrons

Pt@TiO2 core–shell nanostructures were prepared through a hydrothermal method. The dye-sensitization of these Pt@TiO2 core–shell structures allows for a high photocatalytic activity for the generation of hydrogen from proton reduction under visible-light irradiation. When the dyes and TiO2 were co-excited through the combination of two irradiation beams with different wavelengths, a synergic effect was observed, which led to a greatly enhanced H2 generation yield. This is attributed to the rational spatial distribution of the three components (dye, TiO2, Pt), and the vectored transport of photogenerated electrons from the dye to the Pt particles via the TiO2 particle bridge.

scholarly journals [email protected] Core-Shell and Yolk-Shell Nanostructures: Selective Synthesis, Characterization, and Near-Infrared-Mediated Photocatalytic Reduction of Cr(VI)

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Wan-Ni Wang ◽  
Wang Dong ◽  
Chen-Xi Huang ◽  
Bo Liu ◽  
Sheng Cheng ◽  
...  
Keyword(s):  
Near Infrared ◽  
Separation Efficiency ◽  
Solution Process ◽  
Infrared Light ◽  
Core Shell ◽  
Sulfur Source ◽  
Shell Nanoparticles ◽  
Near Infrared Light ◽  
Shell Nanostructures ◽  
Photogenerated Electrons

Constructing near-infrared-light-mediated core-shell nanostructures incorporating upconversion nanoparticles (UCNPs) and semiconductors is of great importance for potential applications in photocatalysis, nano-biomedical engineering, solar cell, etc. In this work, we have demonstrated a two-step solution process to synthesize [email protected] core-shell nanoparticles (CSN). Firstly, a layer of AA-Zn(Cd)[OH]4− composites was coated on UCNPs to form UCNPs@AA-Zn(Cd)[OH]4− composites, which has been converted to [email protected] CSN via sulfidation reaction process using thioacetamide (TAA) as the sulfur source. Moreover, the [email protected] yolk-shell nanoparticles (YSN) have been obtained from the [email protected] CSN after calcination at 400°C, which show significantly photocatalytic activity for reduction of Cr(VI) under near-infrared light. All these can be attributed to the enhanced crystallization degree, resulting in enhanced energy transfer efficiency and separation efficiency of the photogenerated electrons and holes. An alternative strategy is provided in this study for fabrication of UCNP/semiconductor composites for various applications.

scholarly journals Radiofrequency and Near-Infrared Responsive Core–Shell Nanostructures Using Layersome Templates for Cancer Treatment

2019 ◽  
Vol 3 (1) ◽  
pp. 273-281 ◽  
Author(s):  
Animesh Pan ◽  
Md Golam Jakaria ◽  
Samantha A. Meenach ◽  
Geoffrey D. Bothun
Keyword(s):  
Cancer Treatment ◽  
Near Infrared ◽  
Core Shell ◽  
Shell Nanostructures

A review of electrode materials based on core–shell nanostructures for electrochemical supercapacitors

2019 ◽  
Vol 7 (8) ◽  
pp. 3516-3530 ◽  
Author(s):  
Kuo-Chuan Ho ◽  
Lu-Yin Lin
Keyword(s):  
Electrode Materials ◽  
Review Article ◽  
Shell Structures ◽  
Core Shell ◽  
Electrochemical Supercapacitors ◽  
Active Materials ◽  
The Core ◽  
The Past ◽  
Shell Nanostructures ◽  
Core Shell Structure

This review article outlines the most commonly used methods for making the core/shell structures as the active materials for supercapacitors over the past decade (2007–2018), and points out the most efficient combination of the material categories and morphologies for the core/shell structure.

Half-Encapsulated Au Nanorods@CeO2 Core@Shell Nanostructures for Near-Infrared Plasmon-Enhanced Catalysis

2019 ◽  
Vol 2 (3) ◽  
pp. 1516-1524 ◽  
Author(s):  
Jing Pan ◽  
Lingling Zhang ◽  
Songtao Zhang ◽  
Zhan Shi ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Core Shell ◽  
Au Nanorods ◽  
Shell Nanostructures

A near-infrared light-controlled, ultrasensitive one-step photoelectrochemical detection of dual cell apoptosis indicators in living cancer cells

2020 ◽  
Vol 56 (60) ◽  
pp. 8488-8491
Author(s):  
Ying-Ning Zheng ◽  
Cheng-Yi Xiong ◽  
Ying Zhuo ◽  
Ya-Qin Chai ◽  
Wen-Bin Liang ◽  
...  
Keyword(s):  
Cancer Cells ◽  
Cell Apoptosis ◽  
Adenosine Triphosphatase ◽  
Near Infrared ◽  
Infrared Light ◽  
Sodium Potassium ◽  
Near Infrared Light ◽  
Nir Light ◽  
One Step

The proposed near-infrared (NIR) light-controlled, one-step photoelectrochemical (PEC) strategy could simultaneously detect cell apoptosis indicators, phosphatidylserine (Pho) and sodium potassium adenosine triphosphatase (Sat), on living cancer cells.

Highly Luminescent Inverted ZnS/CdS Core/Shell Quantum Dots

2008 ◽  
Vol 8 (8) ◽  
pp. 3949-3954 ◽  
Author(s):  
Madhulika Sharma ◽  
D. Gupta ◽  
D. Kaushik ◽  
A. B. Sharma ◽  
R. K. Pandey
Keyword(s):  
Quantum Dots ◽  
Grazing Angle ◽  
Surface States ◽  
Shell Structures ◽  
Luminescence Spectroscopy ◽  
Core Shell ◽  
Additional Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

Synthesis of highly luminescent and monochromatic inverted core–shell structures utilizing ZnS/CdS quantum dots (QDs) has been investigated. The core/shell quantum dots have been characterized using grazing angle X-ray diffraction (XRD), Transmission electron microscopy, Optical absorption and luminescence spectroscopy. The results suggested that passivation of surface states along with an increased localization of electron and hole in CdS shell layer, give rise to increased monochromaticity with higher quantum yield. The possibility of using the inverted core–shell structure as an additional parameter for tuning the color of luminescence has also been discussed.

Near-infrared driven photocatalytic performance of lanthanide-doped NaYF4@CdS core-shell nanostructures with enhanced upconversion properties

2017 ◽  
Vol 724 ◽  
pp. 481-491 ◽  
Author(s):  
Ramachandran Balaji ◽  
Suneel Kumar ◽  
Kumbam Lingeshwar Reddy ◽  
Vipul Sharma ◽  
Kaustava Bhattacharyya ◽  
...  
Keyword(s):  
Near Infrared ◽  
Photocatalytic Performance ◽  
Core Shell ◽  
Shell Nanostructures
Sign in / Sign up

Export Citation Format

Share Document