scholarly journals The Influence of SiO2Shell on Fluorescent Properties of LaF3:Nd3+/SiO2Core/Shell Nanoparticles

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Cui Kai ◽  
Gao Chao ◽  
Peng Bo ◽  
Wei Wei
Keyword(s):  
Fluorescence Intensity ◽  
Emission Spectra ◽  
Phonon Energy ◽  
Core Shell ◽  
Fluorescent Properties ◽  
Excitation Spectra ◽  
Shell Nanoparticles ◽  
Fluorescent Intensity ◽  
Different Temperatures ◽  
Core Shell Nanoparticles

Distinct effects of the SiO2shell on fluorescence properties of LaF3:Nd3+/SiO2core/shell nanoparticles were demonstrated by annealling the nanoparticles at different temperatures. Emission spectra, excitation spectra, and decay curves of the nanoparticles were measured. A significant improvement of fluorescence intensity was observed for LaF3:Nd3+/SiO2core/shell nanoparticles annealed at 900∘C. The phenomenon is ascribed to the change of environment of LaF3:Nd3+core which is imposed by SiO2shell. And the change is confirmed by the excitation spectra. It provides a useful way to improve fluorescent intensity of the SiO2-coated LaF3:Nd3+nanoparticles. The lifetime for nanoparticles annealed at 900∘Cshows a slight decrease contrast with nanoparticles annealed at 400 and 600∘C. This is caused by the higher phonon energy of SiO2than that of LaF3.

scholarly journals Structural and Spectroscopic Characterization of PM 597 Dye-Silica Core-Shell Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Tahani R. Al-Biladi ◽  
A. S. Al Dwayyan ◽  
M. Naziruddin Khan ◽  
Saif M. H. Qaid ◽  
Khalid Al Zahrani
Keyword(s):  
Emission Spectra ◽  
Spectroscopic Characterization ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Silica Core ◽  
Shell Particles ◽  
Average Size ◽  
Core Shell Nanoparticles ◽  
20 Nm

Nanostructured fluorescent pyrromethene (PM) doped-silica core-shell particles were successfully prepared by Stöber process. The average size of the particles was in the range of 10–20 nm measured by TEM micrograph. The atomic structure and morphology of PM 597/SiO2core/shell nanoparticles were studied by AFM and SEM, respectively. Absorption and emission spectra of the PM 597/SiO2core/shell nanoparticles under the UV irradiation were studied and not significantly influenced at the position of peaks. Finally, amplified spontaneous emission (ASE) and photobleaching of dye were examined and found no significant influence on the peaks of PM dye due to the formation of smaller sizes of PM 597/SiO2core/shell nanoparticles. The observed PM 597/SiO2core/shell nanoparticles were different in shapes with smaller size distribution and highly luminescent. Majority of nanoparticles were roughly spherical with many of them aggregated. The less photobleaching of dye core may be due to the protection of pumped energy by SiO2shell and restricts the leakage of dye.

Fluorescent DNA Probes Based on Quantum Dots and Core/Shell Quantum Dots

2013 ◽  
Vol 372 ◽  
pp. 115-118
Author(s):  
Meng Meng Song ◽  
Wen Juan Guo ◽  
Zhao Dai ◽  
Kai Li Qiu ◽  
Jun Fu Wei
Keyword(s):  
Quantum Dots ◽  
Dna Probes ◽  
Dna Probe ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Probe Field ◽  
Fluorescent Intensity ◽  
Cdte Qds ◽  
Quenching Efficiency ◽  
Core Shell Nanoparticles

Fluorescent DNA probes based on the fluorescence resonance energy transfer (FRET) were presented in this paper when AuNPs were as the energy acceptors and CdTe quantum dots and CdTe/SiO2 core/shell nanoparticles were as the energy acceptors, respectively. The DNA probes were prepared when energy donors and acceptors were conjugated with two single-stranded complementary oligonucleotides and hybridized with each other and the fluorescent intensity of probes could be decreased. The quenching efficiency of DNA probe was about 67 % when CdTe QDs were as the energy donors, while that of DNA probe was about 75 % when CdTe/SiO2 fluorescent core/shell nanoparticles were as the energy acceptors, which indicated that CdTe/SiO2 core/shell nanoparticles were suitable donors compared with CdTe QDs in DNA probe field.

Effect of loading 5-phenyl-4H-1,2,4-triazole-3-thiol onto polypyrrole chitosan core shell nanoparticles on release rate, antimicrobial, and antitumor activities

2016 ◽  
Vol 32 (2) ◽  
pp. 111-127 ◽  
Author(s):  
Nehal Salahuddin ◽  
Ahmed A Elbarbary ◽  
Mohamed L Salem ◽  
Samar Elksass
Keyword(s):  
Ehrlich Ascites Carcinoma ◽  
Antibacterial Activities ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Ehrlich Ascites ◽  
Order Release ◽  
Zero Order Release ◽  
Different Temperatures ◽  
Core Shell Nanoparticles

Polypyrrole chitosan core shell nanoparticles were synthesized by in situ oxidation polymerization of pyrrole using FeCl3 in chitosan aqueous solution. 5-Phenyl-4H-1,2,4-triazole-3-thiol (I) was prepared and loaded into polypyrrole chitosan core shell nanoparticles at two different temperatures (25°C and 80°C). These core shell nanoparticle systems are insoluble in acidic medium and have good adsorption capacity. The release of loaded triazole was studied in different pH media (2, 7.4). The mechanism of triazole release was determined by applying zero-order release, first-order release, Higuchi model, Hixson–Crowell, and Korsmeyer–Peppas kinetics equations. The antibacterial activities against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Staphylococcus epidermidis were evaluated. The potential cytotoxicity against Ehrlich ascites carcinoma cells and liver (HEPG2) cell line in vitro was tested.

scholarly journals One-pot one-step synthesis of Au@SiO2 core–shell nanoparticles and their shell-thickness-dependent fluorescent properties

RSC Advances ◽  
2019 ◽  
Vol 9 (31) ◽  
pp. 17674-17678 ◽  
Author(s):  
Shan Zhang ◽  
Xiaochuan Xu ◽  
Guoyu Zhang ◽  
Bin Liu ◽  
Jianhui Yang
Keyword(s):  
Shell Thickness ◽  
Silica Shell ◽  
Core Shell ◽  
Core Size ◽  
Fluorescent Properties ◽  
Step Method ◽  
Shell Nanoparticles ◽  
One Pot ◽  
One Step ◽  
Core Shell Nanoparticles

Au@SiO2 core–shell nanoparticles with tunable Au core size and silica shell thickness were prepared by a facile one-pot one-step method.

Preparation and Electrocatalytic Performance of Thin-shell Ni/Pt Core-shell Nanoparticles

2012 ◽  
Vol 27 (1) ◽  
pp. 95-101
Author(s):  
Shi-Bin LIU ◽  
Chun-Ying YANG ◽  
Zhong-Lin ZHANG ◽  
Dong-Hong DUAN ◽  
Xiao-Gang HAO ◽  
...  
Keyword(s):  
Thin Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Electrocatalytic Performance ◽  
Core Shell Nanoparticles

Pluronic-Based Core/Shell Nanoparticles for Drug Delivery and Diagnosis

2013 ◽  
Vol 20 (28) ◽  
pp. 3488-3499 ◽  
Author(s):  
Yon Jung ◽  
Hwanbum Lee ◽  
Jae Kim ◽  
Eun Koo ◽  
Keun Oh ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Colorimetric and SERS dual-mode sensing of mercury (II) based on controllable etching of Au@Ag core/shell nanoparticles

2021 ◽  
Vol 330 ◽  
pp. 129364
Author(s):  
Jinhua Wang ◽  
Jiamin Wu ◽  
Yuping Zhang ◽  
Xia Zhou ◽  
Ziwei Hu ◽  
...  
Keyword(s):  
Core Shell ◽  
Dual Mode ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles
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