Multicolor Core/Shell‐Structured Upconversion Fluorescent Nanoparticles

2008 ◽  
Vol 20 (24) ◽  
pp. 4765-4769 ◽  
Author(s):  
Zhengquan Li ◽  
Yong Zhang ◽  
Shan Jiang
Keyword(s):  
Core Shell ◽  
Fluorescent Nanoparticles

Molecular beacon-decorated polymethylmethacrylate core-shell fluorescent nanoparticles for the detection of survivin mRNA in human cancer cells

2017 ◽  
Vol 88 ◽  
pp. 15-24 ◽  
Author(s):  
Barbara Adinolfi ◽  
Mario Pellegrino ◽  
Ambra Giannetti ◽  
Sara Tombelli ◽  
Cosimo Trono ◽  
...  
Keyword(s):  
Cancer Cells ◽  
Molecular Beacon ◽  
Human Cancer ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Survivin Mrna ◽  
Human Cancer Cells

scholarly journals Synthesis of bi-phase dispersible core-shell FeAu@ZnO magneto-opto-fluorescent nanoparticles

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Xue-Mei Li ◽  
Hong-Ling Liu ◽  
Xiao Liu ◽  
Ning Fang ◽  
Xian-Hong Wang ◽  
...  
Keyword(s):  
Core Shell ◽  
Fluorescent Nanoparticles

Photostimulable Fluorescent Nanoparticles for Biological Imaging

2011 ◽  
Vol 1342 ◽  
Author(s):  
Andres Osvet ◽  
Moritz Milde ◽  
Sofia Dembski ◽  
Sabine Rupp ◽  
Carsten Gellermann ◽  
...  
Keyword(s):  
Sol Gel ◽  
Red Light ◽  
Luminescent Properties ◽  
Transition Metal Ions ◽  
Biological Imaging ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Photostimulated Luminescence ◽  
Phosphor Layer ◽  
Preparation Conditions

ABSTRACTSpherical monodisperse core/shell-type nanoparticles, comprising an amorphous SiO2 core coated with a luminescent phosphor layer were synthesized by the modified Pechini processes. The sol-gel method allows covering the 50 – 500 nm core particles with different inorganic phosphor layers of about 10 nm thickness, doped with rare-earth or transition metal ions which determine the luminescent properties. Particles comprising a Zn2SiO4 shell, doped with Mn2+ ions, are not only fluorescent under UV irradiation (260 nm), but store the activation energy by trapping electrons/holes at lattice defects. This energy is released as phosphorescence in the time scale of seconds and minutes, or as photostimulated luminescence under the excitation of red light (650 nm). Traps related to these processes are different, and their concentration is affected by the preparation conditions of the particles.

Facile synthesis of core–shell magnetic-fluorescent nanoparticles for cell imaging

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 46226-46230 ◽  
Author(s):  
Zhuo Gao ◽  
Wenqing Huang ◽  
Yang Zheng ◽  
Yanjiao Lu ◽  
Shusen You ◽  
...  
Keyword(s):  
Cell Imaging ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Facile Synthesis

In this work, we present a novel type of magnetic-fluorescent bifunctional nanoparticle (NP).

Tuning core–shell SiO2@CdTe@SiO2 fluorescent nanoparticles for cell labeling

2013 ◽  
Vol 1 (17) ◽  
pp. 2315 ◽  
Author(s):  
Yian Zhu ◽  
Zhen Li ◽  
Min Chen ◽  
Helen M. Cooper ◽  
Zhi Ping Xu
Keyword(s):  
Cell Labeling ◽  
Core Shell ◽  
Fluorescent Nanoparticles

scholarly journals Fabrication of Double Emission Enhancement Fluorescent Nanoparticles with Combined PET and AIEE Effects

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5732
Author(s):  
Hsing-Ju Wu ◽  
Cheng-Chung Chang
Keyword(s):  
Silica Nanoparticles ◽  
Drug Carriers ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Intracellular Imaging ◽  
Turn On ◽  
Emission Enhancement ◽  
The Stöber Method ◽  
Fluorescence Turn On ◽  
And Function

The major challenge in the fabrication of fluorescent silica nanoparticles (FSNs) based on dye-doped silica nanoparticles (DDSNs) is aggregation-caused fluorescence quenching. Here, we constructed an FSN based on a double emission enhancement (DEE) platform. A thio-reactive fluorescence turn-on molecule, N-butyl-4-(4-maleimidostyryl)-1,8-naphthalimide (CS), was bound to a silane coupling agent, (3-mercaptopropyl)-trimethoxysilane (MPTMS), and the product N-butyl-4-(3-(trimethoxysilyl-propylthio)styryl)-1,8-naphthalimide (CSP) was further used to fabricate a core–shell nanoparticle through the Stöber method. We concluded that the turn-on emission by CSP originated from the photoinduced electron transfer (PET) between the maleimide moiety and the CSP core scaffold, and the second emission enhancement was attributed to the aggregation-induced emission enhancement (AIEE) in CSP when encapsulated inside a core–shell nanoparticle. Thus, FSNs could be obtained through DEE based on a combination of PET and AIEE effects. Systematic investigations verified that the resulting FSNs showed the traditional solvent-independent and photostable optical properties. The results implied that the novel FSNs are suitable as biomarkers in living cells and function as fluorescent visualizing agents for intracellular imaging and drug carriers.

Critical shell thickness and emission enhancement of NaYF4:Yb,Er/NaYF4/silica core/shell/shell nanoparticles

2009 ◽  
Vol 24 (12) ◽  
pp. 3559-3568 ◽  
Author(s):  
Li Peng Qian ◽  
Du Yuan ◽  
Guang Shun Yi ◽  
Gan Moog Chow
Keyword(s):  
Emission Intensity ◽  
Shell Thickness ◽  
Silica Coating ◽  
Inorganic Nanoparticles ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Shell Nanoparticles ◽  
Silica Core ◽  
Core Shell Nanoparticles

Amorphous silica shells, used for functionalization of inorganic nanoparticles in bioapplications, were coated on chemically synthesized NaYF4:Yb,Er upconversion fluorescent nanoparticles via a reverse microemulsion method by using dual surfactants of polyoxyethylene (5) nonylphenylether and 1-hexanol, and tetraethyl orthosilicate as precursor. NaYF4:Yb,Er nanoparticles were equiaxed with a particle size of 11.1 ± 1.3 nm. The thickness of silica shell was ∼8 nm. NaYF4:Yb,Er/silica core/shell nanoparticles were well dispersed in solvents such as ethanol and deionized water. The emission intensities of NaYF4:Yb,Er/silica core/shell nanoparticles remained the same as that of uncoated nanoparticles after surface functionalization with an amine group using (3-aminopropyl)-trimethoxysilan. Silica, although providing a good barrier to the nonradiative relaxation between the upconversion nanoparticles and the environments, did not enhance the emission intensity of upconversion nanoparticles. To increase the emission intensity of NaYF4:Yb,Er/silica core/shell nanoparticles, an undoped NaYF4 shell (∼3-nm thick) was deposited on the upconversion nanoparticles before the silica coating. The total emission intensity of NaYF4:Yb,Er/NaYF4/silica core/shell/shell nanoparticles increased by 15 times compared to that without the intermediate NaYF4 shell. The critical shell thickness of NaYF4 was ∼3 nm, beyond which no further emission intensity enhancement was observed.

A facile approach for cupric ion detection in aqueous media using polyethyleneimine/PMMA core–shell fluorescent nanoparticles

2009 ◽  
Vol 20 (36) ◽  
pp. 365502 ◽  
Author(s):  
Jian Chen ◽  
Fang Zeng ◽  
Shuizhu Wu ◽  
Junhua Su ◽  
Jianqing Zhao ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Ion Detection ◽  
Cupric Ion
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