scholarly journals Dansyl-Labelled Ag@SiO2 Core-Shell Nanostructures—Synthesis, Characterization, and Metal-Enhanced Fluorescence

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5168
Author(s):  
Elżbieta Szczepańska ◽  
Anna Synak ◽  
Piotr Bojarski ◽  
Paweł Niedziałkowski ◽  
Anna Wcisło ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Fluorescence Intensity ◽  
Control Sample ◽  
Core Shell ◽  
Enhanced Fluorescence ◽  
Shell Nanostructures ◽  
Dansyl Group ◽  
Transmission Electron ◽  
Silver Mirror ◽  
Water Wettability

The present work describes synthesis, characterization, and use of a new dansyl-labelled Ag@SiO2 nanocomposite as an element of a new plasmonic platform to enhance the fluorescence intensity. Keeping in mind that typical surface plasmon resonance (SPR) characteristics of silver nanoparticles coincide well enough with the absorption of dansyl molecules, we used them to build the core of the nanocomposite. Moreover, we utilized 10 nm amino-functionalized silica shell as a separator between silver nanoparticles and the dansyl dye to prevent the dye-to-metal energy transfer. The dansyl group was incorporated into Ag@SiO2 core-shell nanostructures by the reaction of aminopropyltrimethoxysilane with dansyl chloride and we characterized the new dansyl-labelled Ag@SiO2 nanocomposite using transmission electron microscopy (TEM) and Fourier-transform infrared spectroscopy (FTIR). Additionally, water wettability measurements (WWM) were carried out to assess the hydrophobicity and hydrophilicity of the studied surface. We found that the nanocomposite deposited on a semitransparent silver mirror strongly increased the fluorescence intensity of dansyl dye (about 87-fold) compared with the control sample on the glass, proving that the system is a perfect candidate for a sensitive plasmonic platform.

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.

scholarly journals Enhanced fluorescence properties of terbium complex/poly-l-lactic acid superfine fibers sensitized by the LSPR effect of silver nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (32) ◽  
pp. 19808-19814 ◽  
Author(s):  
Shipeng Wen ◽  
Guiming Zhang ◽  
Rong Zhang ◽  
Liqun Zhang ◽  
Li Liu
Keyword(s):  
Silver Nanoparticles ◽  
Lactic Acid ◽  
Quantum Efficiency ◽  
Fluorescence Intensity ◽  
Fluorescence Properties ◽  
Composite Fibers ◽  
Enhanced Fluorescence ◽  
Terbium Complex ◽  
Ag Nps ◽  
Lspr Effect

Due to the LSPR effect of Ag-NPs, the fluorescence intensity, quantum efficiency of Tb-complex in the composite fibers were improved.

Study on the Ag@SiO2 Enhanced the Luminous Intensity of the Terbium Complexes with Benzoic Acid and 1,10-phenanthroline

2014 ◽  
Vol 472 ◽  
pp. 711-714 ◽  
Author(s):  
Bin Yue ◽  
Yuan Li ◽  
Kai Kong ◽  
Hai Bin Chu ◽  
Yong Liang Zhao
Keyword(s):  
Benzoic Acid ◽  
Emission Intensity ◽  
Shell Thickness ◽  
Silica Shell ◽  
Excitation Wavelength ◽  
Core Shell ◽  
Enhanced Fluorescence ◽  
The Core ◽  
Transmission Electron ◽  
Terbium Complexes

Five kinds of terbium complexes have been synthesized respectively with benzoic acid, 1,10-phenanthroline and 2,2'-bipyridine as ligands. The core-shell Ag@SiO2nanocomposites was prepared. The result of transmission electron microscopy (TEM) shows the diameter of the nanosilver is about 50 nm and the thickness of the silica shell is 10, 25 and 80 nm. Combine the nanoparticles composite with terbium complexes, we explore the changes of excitation wavelength and emission intensity. The results show that: by loading the terbium complexes above the different size of nanoparticles, the excitation wavelengths of complexes do not shift, and the emission intensity of the complexes are enhanced in the presence of Ag@SiO2nanoparticles because of metal-enhanced fluorescence (MEF), but at only a limited shell thickness particle region.

scholarly journals Effect of Silver Nanoparticles on Fluorescence Intensity of Fluoreseina Dye Mixed in One Solution

2021 ◽  
Vol 19 (51) ◽  
pp. 54-63
Author(s):  
Ruwaida Tahseen Shbeeb ◽  
Sarmed S. Mahdi ◽  
Sabreen A. Khalaf
Keyword(s):  
Silver Nanoparticles ◽  
Fluorescence Intensity ◽  
Chemical Reduction ◽  
Metal Nanoparticle ◽  
Metal Nanostructures ◽  
Enhanced Fluorescence ◽  
Ag Nps ◽  
Study Results ◽  
Layer Coating ◽  
Dye Solutions

Metal enhanced fluorescence (MEF) is an unequaled phenomenon of metal nanoparticle surface plasmons, when light interacts with the metal nanostructures (silver nanoparticles) which result electromagnetic fields to promote the sensitivity of fluorescence. This work endeavor to study the influence of silver nanoparticles on fluorescence intensity of Fluoreseina dye by employment mixture solution with different mixing ratio. Silver nanoparticles had been manufactured by the chemical reduction method so that Ag NP layer coating had been done by hot rotation liquid method. The optical properties of the prepared samples (mixture solution of Fluoreseina dye solutions and colloidal solution with 5 minutes prepared of Ag NPs) tested by using UV-VIS absorption and Fluorescence spectrophotometer. by using AFM, SEM testes, the structure of silver nanoparticles had been estimated. the result of this work showed that adding Ag NPs colloidal to Fluoreseina dye solution help get a significant increase in the fluorescence intensity of this dye. this study results show that its significant to recent related studies in MEF.

Fluorescence enhancement of fisetin by silver nanoparticles with cetyltrimethyl ammonium bromide micelles

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7433-7439 ◽  
Author(s):  
Xiaodan Liu ◽  
Xia Wu
Keyword(s):  
Silver Nanoparticles ◽  
Fluorescence Intensity ◽  
Fluorescence Enhancement ◽  
Synergistic Action ◽  
Ammonium Bromide ◽  
Enhanced Fluorescence ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Metal Enhanced Fluorescence ◽  
Cetyltrimethyl Ammonium

The synergistic action of solubilization and sensitization of CTAB micelles and metal-enhanced fluorescence of AgNPs enhance fluorescence intensity of fisetin.

scholarly journals Hydrothermal Synthesis and Mechanism of Unusual Zigzag Ag2Te and Ag2Te/C Core-Shell Nanostructures

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Saima Manzoor ◽  
Yumin Liu ◽  
Zhongyuan Yu ◽  
Xiuli Fu ◽  
Guijun Ban
Keyword(s):  
Electron Microscopy ◽  
Single Step ◽  
Reducing Agent ◽  
Synthesis Process ◽  
Core Shell ◽  
Hydrothermal Route ◽  
Shell Nanostructures ◽  
Transmission Electron ◽  
Sodium Tellurite ◽  
Compositional Properties

A single step surfactant-assisted hydrothermal route has been developed for the synthesis of zigzag silver telluride nanowires with diameter of 50–60 nm and length of several tens of micrometers. Silver nitrate (AgNO3) and sodium tellurite (Na2TeO3), are the precursors and polyvinylpyrrolidone (PVP) is used as surfactant in the presence of the reducing agent, that is, hydrazine hydrate (N2H4·H2O). In addition to the zigzag nanowires a facile hydrothermal reduction-carbonization route is proposed for the preparation of uniform core-shell Ag2Te/C nanowires. In case of Ag2Te/C synthesis process the same precursors are employed for Ag and Te along with the ethylene glycol used as reducing agent and glucose as the carbonizing agent. Morphological and compositional properties of the prepared products are analyzed with the help of scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy, respectively. The detailed formation mechanism of the zigzag morphology and reduction-carbonization growth mechanism for core-shell nanowires are illustrated on the bases of experimental results.

Tunable emission properties of core-shell ZnCuInS-ZnS quantum dots with enhanced fluorescence intensity

2018 ◽  
Vol 34 (6) ◽  
pp. 942-948 ◽  
Author(s):  
Yihe Jia ◽  
Haicheng Wang ◽  
Long Xiang ◽  
Xiaoguang Liu ◽  
Wei Wei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Intensity ◽  
Core Shell ◽  
Enhanced Fluorescence ◽  
Emission Properties ◽  
Tunable Emission
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