Multifunctional magnetic and fluorescent core–shell nanoparticles for bioimaging

Nanoscale ◽  
2015 ◽  
Vol 7 (5) ◽  
pp. 1606-1609 ◽  
Author(s):  
Yanjiao Lu ◽  
Bicheng He ◽  
Jie Shen ◽  
Jie Li ◽  
Wantai Yang ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Strong Interaction ◽  
Near Infrared ◽  
Core Shell ◽  
Cell Nuclei ◽  
Shell Nanoparticles ◽  
Near Infrared Fluorescence ◽  
Superparamagnetic Behavior ◽  
Core Shell Nanoparticles

Magnetic and fluorescent core–shell nanoparticles exhibit superparamagnetic behavior and emit strong near-infrared fluorescence. The nanoparticles are highly biocompatible and accumulate in cell nuclei via strong interaction with nucleic acids.

Near-infrared photocatalysis based on YF3 : Yb3+,Tm3+/TiO2 core/shell nanoparticles

2010 ◽  
Vol 46 (13) ◽  
pp. 2304 ◽  
Author(s):  
Weiping Qin ◽  
Daisheng Zhang ◽  
Dan Zhao ◽  
Lili Wang ◽  
Kezhi Zheng
Keyword(s):  
Near Infrared ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Lanthanide-doped NaGdF4 core–shell nanoparticles for non-contact self-referencing temperature sensors

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 5675-5679 ◽  
Author(s):  
Shuhong Zheng ◽  
Weibo Chen ◽  
Dezhi Tan ◽  
Jiajia Zhou ◽  
Qiangbing Guo ◽  
...  
Keyword(s):  
Near Infrared ◽  
Temperature Sensors ◽  
Infrared Laser ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

A self-referencing nanothermometer is developed based on near infrared laser stimulated visible upconversion from lanthanide-activated core–shell nanoparticles.

scholarly journals Bifunctional Tm3+,Yb3+:GdVO4@SiO2 Core-Shell Nanoparticles in HeLa Cells: Upconversion Luminescence Nanothermometry in the First Biological Window and Biolabelling in the Visible

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 993 ◽  
Author(s):  
Oleksandr Savchuk ◽  
Joan Josep Carvajal Marti ◽  
Concepción Cascales ◽  
Patricia Haro-Gonzalez ◽  
Francisco Sanz-Rodríguez ◽  
...  
Keyword(s):  
Hela Cells ◽  
Near Infrared ◽  
Energy Levels ◽  
Upconversion Luminescence ◽  
Biological Tissues ◽  
Visible Range ◽  
Core Shell ◽  
Fluorescence Intensity Ratio ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

The bifunctional possibilities of Tm,Yb:GdVO4@SiO2 core-shell nanoparticles for temperature sensing by using the near-infrared (NIR)-excited upconversion emissions in the first biological window, and biolabeling through the visible emissions they generate, were investigated. The two emission lines located at 700 and 800 nm, that arise from the thermally coupled 3F2,3 and 3H4 energy levels of Tm3+, were used to develop a luminescent thermometer, operating through the Fluorescence Intensity Ratio (FIR) technique, with a very high thermal relative sensitivity. Moreover, since the inert shell surrounding the luminescent active core allows for dispersal of the nanoparticles in water and biological compatible fluids, we investigated the penetration depth that can be realized in biological tissues with their emissions in the NIR range, achieving a value of 0.8 mm when excited at powers of 50 mW. After their internalization in HeLa cells, a low toxicity was observed and the potentiality for biolabelling in the visible range was demonstrated, which facilitated the identification of the location of the nanoparticles inside the cells, and the temperature determination.

Experimental and theoretical study for miR-155 detection through resveratrol interaction with nucleic acids using magnetic core-shell nanoparticles

2020 ◽  
Vol 187 (8) ◽  
Author(s):  
Samira Yazdanparast ◽  
Ali Benvidi ◽  
Mostafa Azimzadeh ◽  
Marzieh Dehghan Tezerjani ◽  
Mohammad Reza Ghaani
Keyword(s):  
Nucleic Acids ◽  
Theoretical Study ◽  
Magnetic Core ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Near-infrared upconversion of Nd through Gd-mediated interfacial energy transfer in core-shell nanoparticles

2018 ◽  
Vol 8 (8) ◽  
pp. 2449 ◽  
Author(s):  
Lili Tao ◽  
Xuelong Liu ◽  
Junshan He ◽  
Yajun Lou ◽  
Yonghui Li ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Interfacial Energy ◽  
Near Infrared ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Self-Assembly of Ordered SiO2@Au Core-Shell Nanoparticle Arrays

2014 ◽  
Author(s):  
Huan Yang ◽  
Jinyou Shao ◽  
Ben Q. Li
Keyword(s):  
Self Assembly ◽  
Near Infrared ◽  
Interparticle Distance ◽  
Optical Diffraction ◽  
Core Shell ◽  
Surface Plasma Resonance ◽  
Sio2 Particle ◽  
Shell Nanoparticles ◽  
Patterned Substrate ◽  
Core Shell Nanoparticles

This paper presents a wet-based self-assembly process for nano-fabricating 1-D arrays of spherical nanoparticles and/or gold-nanoshells with controllable inter-particle distance for near infrared optical communications and for plasmon polariton waveguides featured with the lateral mode size below the optical diffraction limit. The process entails two main procedures. First, the SiO2 nanoparticle colloidal solution was restricted to flow through the gap between the patterned substrate and the cover slip, and the particles, trapped in the patterned, recessed regions, self-assembled to form closely arranged SiO2 particle arrays. These SiO2 particle arrays then acted as a template with which SiO2@Au nanoshell particle arrays of interest with desirable interparticle distance were obtained by repeating the above procedure with SiO2@Au dispersed solution. The needed high quality SiO2@Au core-shell nanoparticles with tunable surface plasma resonance also were synthesized in our laboratory using the seed-and-grow method. Results show that, with this method, the interparticle distance of the nanoshell particle arrays can be controlled by a proper selection of the patterned groove and the sizes of SiO2 and SiO2@Au nanoshell particles. As demonstrated by experiment, the method is general and can be applied to obtain nanoparticle particle arrays of other materials with controllable distance.

Near infrared imaging of intracellular GSH by AuNCs@MnO2 core-shell nanoparticles based on absorption competition mechanism

The Analyst ◽  
2021 ◽  
Author(s):  
Haiyang Yao ◽  
Difei Jian ◽  
Gaoqiu Dong ◽  
Jiamin Sun ◽  
Shasha Sun ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Manganese Dioxide ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Core Shell ◽  
Near Infrared Imaging ◽  
Shell Nanoparticles ◽  
Competition Mechanism ◽  
Intracellular Glutathione ◽  
Core Shell Nanoparticles

Dynamically monitoring of intracellular glutathione (GSH), a crucial biomarker of oxidative stress, is of significance for diagnostic and treatment of the certain diseases. Although manganese dioxide (MnO2) based GSH fluorescent...

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