Enhanced luminescence efficiency of aqueous dispersible NaYF4:Yb/Er nanoparticles and the effect of surface coating

RSC Advances ◽  
2016 ◽  
Vol 6 (26) ◽  
pp. 22074-22082 ◽  
Author(s):  
Anees A. Ansari ◽  
Ranvijay Yadav ◽  
S. B. Rai
Keyword(s):  
Surface Coating ◽  
Upconversion Nanoparticles ◽  
Luminescence Efficiency ◽  
Silica Layers ◽  
Enhanced Luminescence ◽  
Effect Of Surface

In a general approach, we designed and synthesized monodisperse, well-defined, highly emissive and aqueous dispersible NaYF4:Yb/Er upconversion nanoparticles, and thereafter their surfaces were coated with inert NaYF4 and silica layers.

Physiochemical properties of greatly enhanced photoluminescence of aqueous dispersible upconversion CaF2:Yb/Er nanoparticles

2017 ◽  
Vol 16 (6) ◽  
pp. 890-896 ◽  
Author(s):  
Anees A. Ansari ◽  
Ranvijay Yadav ◽  
S. B. Rai
Keyword(s):  
Metal Complex ◽  
Surface Coating ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles ◽  
Physiochemical Properties ◽  
Enhanced Photoluminescence ◽  
Silica Layers

Highly aqueous soluble CaF2:Yb/Er@CaF2@SiO2 upconversion nanoparticles were prepared via metal complex decomposition rout. Gradually surface coating with an inert CaF2 and silica layers greatly enhanced their optical and luminescence properties, which are highly usable for luminescent biolabeling or optical bio-probe etc.

Effect of Surface Morphology and Microstructure on Powdering Resistance Performance of GA Coatings with Different Aluminum Contents

2014 ◽  
Vol 940 ◽  
pp. 41-45
Author(s):  
Xun Hua Yuan ◽  
Chun Yu Qi ◽  
Qi Fu Zhang
Keyword(s):  
Surface Morphology ◽  
Surface Coating ◽  
Steel Sheet ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inhibition Effect ◽  
Al Content ◽  
Resistance Performance ◽  
Galvannealed Steel ◽  
Effect Of Surface

The surface morphology and microstructure of galvannealed steel sheet (GA) coatings prepared at different galvannealing parameters were analyzed by X-ray diffraction and SEM, and powdering amount of GA coating was investigated by the double-Olsen powdering tester. The results show that when the Al contents below 0.16 wt%, the Ra of GA coating surface was measured namely below 1.0 μm, and powdering amount of GA coating was below 30 mg/m2, it is within a reasonable value required by automotive makers. After that with the Al contents increased in zinc liquid the amount of powdering increased, this means that the powdering resistance performance of GA coating not only depended on the iron content in the coating, but depended on the roughness profiles of the surface coating. When the galvanizing coating with 0.22 wt% Al content and galvannealing at 500 °C, with the inhibition effect of Fe2Al5Znxinhibit layer, the thickness of δ1k-phase was different in the GA coating, which deteriorated the powdering resistance performance of GA coating.

Dimensional instability of cement-bonded particleboard: The effect of surface coating

2004 ◽  
Vol 34 (7) ◽  
pp. 1189-1197 ◽  
Author(s):  
M.Z Fan ◽  
P.W Bonfield ◽  
J.M Dinwoodie ◽  
J Boxall ◽  
M.C Breese
Keyword(s):  
Surface Coating ◽  
Dimensional Instability ◽  
Effect Of Surface

Effect of surface coating composition on quantum dot mobility in porous media

2013 ◽  
Vol 15 (8) ◽  
Author(s):  
Yonggang Wang ◽  
Huiguang Zhu ◽  
Matthew D. Becker ◽  
Jessica Englehart ◽  
Linda M. Abriola ◽  
...  
Keyword(s):  
Porous Media ◽  
Quantum Dot ◽  
Surface Coating ◽  
Coating Composition ◽  
Effect Of Surface

Enhanced Luminescence Efficiency from Hydrogel Microbead Encapsulated Quantum Dots

2006 ◽  
Vol 959 ◽  
Author(s):  
Arup Neogi ◽  
Santaneel Ghosh ◽  
Jianyou Li ◽  
Tong Cai ◽  
Zhibing Hu
Keyword(s):  
Phase Transition ◽  
Quantum Dots ◽  
Refractive Index ◽  
Optical Properties ◽  
Index Volume ◽  
Volume Density ◽  
Volume Phase Transition ◽  
Thermoresponsive Polymer ◽  
Luminescence Efficiency ◽  
Enhanced Luminescence

ABSTRACTIn this paper, a novel quantum dot (QD) based nanomaterial system is presented for efficient FRET analysis. The quantum dots have been embedded in hydrogel microspheres based on poly(N-isopropylacrylamide) (PNIPAM) a thermoresponsive polymer that undergoes a volume phase transition across the low critical solution (LCST). The optical properties of the quantum dots entrapped within the gel microspheres has been modified due to change in refractive index, volume density of the surrounding hydrogel medium. The QDs encapsulated in the PNIPAM microspheres showed 100–200 % enhancement in the PL efficiency as the microgels shrank at the temperature above the LCST temperature of the gel.

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