scholarly journals Development of Er3+, Yb3+ Co-Doped Y2O3 NPs According to Yb3+ Concentration by LP–PLA Method: Potential Further Biosensor

Biosensors ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 150
Author(s):  
Cheol-Woo Park ◽  
Dong-Jun Park
Keyword(s):  
Pulsed Laser ◽  
Green Emission ◽  
Biological Imaging ◽  
Additive Concentration ◽  
Uniform Size ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Diagnostic Applications ◽  
Ceramic Targets ◽  
Co Doped

As diagnostic biosensors for analyzing fluids from the human body, the development of inorganic NPs is of increasing concern. For one, nanoceramic phosphors have been studied to meet the increasing requirements for biological, imaging, and diagnostic applications. In this study, Y2O3 NPs co-doped with trivalent rare earths (erbium and ytterbium) were obtained using a liquid phase–pulsed laser ablation (LP–PLA) method after getting high density Er, Yb:Y2O3 ceramic targets by Spark plasma sintering (SPS). Most NPs are under 50 nm in diameter and show high crystallinity of cubic Y2O3 structure, containing (222), (440), and (332) planes via HR–TEM. Excitation under a 980 nm laser to a nanoparticle solution showed 525 and 565 nm green, and 660 nm red emissions. The green emission intensity increased and decreased with increasing Yb3+ additive concentration, when the red spectrum continuously strengthened. Utilizing this study’s outcome, we suggest developing technology to mark invisible biomolecules dissolved in a solvent using UC luminescence of Er3+, Yb3+ co-doped Y2O3 NPs by LP–PLA. The LP–PLA method has a potential ability for the fabrication of UC NPs for biosensors with uniform size distribution by laser parameters.

Te and SiC co-doped MgB2 obtained by an ex situ spark plasma sintering technique

2013 ◽  
Vol 68 (6) ◽  
pp. 428-431 ◽  
Author(s):  
G. Aldica ◽  
S. Popa ◽  
M. Enculescu ◽  
P. Badica
Keyword(s):  
Spark Plasma Sintering ◽  
Ex Situ ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Doped Mgb2 ◽  
Co Doped

scholarly journals Luminescence properties of the Mg co–doped Ce:SrHfO3 ceramics prepared by the Spark Plasma Sintering Method

2016 ◽  
Vol 90 ◽  
pp. 287-291 ◽  
Author(s):  
Hiroyuki Chiba ◽  
Shunsuke Kurosawa ◽  
Koichi Harata ◽  
Rikito Murakami ◽  
Akihiro Yamaji ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Luminescence Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method ◽  
Co Doped

scholarly journals Synthesis and Characterization of SrHfO3 Co-doped with Gd2O3 and Yb2O3 (SHGY)

2020 ◽  
Author(s):  
Hemalatha Kandi ◽  
Prof.Ramji Koona ◽  
G.M.J Raju
Keyword(s):  
Structural Information ◽  
Synthesis Method ◽  
Composition Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Plasma Sintering ◽  
Rate Of Increase ◽  
Spark Plasma ◽  
New Material ◽  
Co Doped

Abstract A new material SHGY is obtained after synthesizing SrHfO3 co-doped with rare earth oxides (5 mol%Gd2O3 and 5 mol% Yb2O3). This process is carried out by a mechanical solid-state synthesis method. The synthesized powder is annealed at 1450ºC keeping rate of increase of 3ºC/min for 2hours. The phase and structural information of synthesized powder is characterized by X-Ray Diffraction (XRD) technique. The powder sample is sintered by Spark Plasma Sintering (SPS) at 1700ºC for 15 minutes to form into a pellet. The microstructure analysis is done by using Field Emission Scanning Electron Microscopy (FESEM) followed by composition analysis by Energy Dispersive Spectroscopy (EDS). The phase purity is examined by Thermal Gravimetric Analysis and Differential Thermal Analysis (TG-DTA) and studies conclude that weight loss is < 3% and there are no changes in phase transformation. Finally, Thermal Expansion Coefficient (CTE) is studied by a Dilatometer. Results stated there is an increase in the CTE in the range of 8.82-13.0 × 10− 6K− 1 calculated temperature range 100–1000ºC. This result of CTE showed there is a 19.2% (10.5 × 10− 6K− 1(200–1100ºC)) increase compared to the YSZ. This aids in the reduction of thermal mismatches between the substrate and topcoat in Thermal barrier applications (TBC).

scholarly journals Quasi-intrinsic colossal permittivity in Nb and In co-doped rutile TiO2 nanoceramics synthesized through a oxalate chemical-solution route combined with spark plasma sintering

2015 ◽  
Vol 17 (26) ◽  
pp. 16864-16875 ◽  
Author(s):  
HyukSu Han ◽  
Pascal Dufour ◽  
Sungwook Mhin ◽  
Jeong Ho Ryu ◽  
Christophe Tenailleau ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Spark Plasma Sintering ◽  
Chemical Solution ◽  
Rutile Tio2 ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Solution Route ◽  
Colossal Permittivity ◽  
Chemical Solution Route ◽  
Co Doped

Homogeneous electrical properties of Nb and In co-doped NITO nanoceramic over the microstructure.

Preparation and Properties of Up-Conversion Luminescent NaYF4:Yb3+, Er3+ Ceramics

2016 ◽  
Vol 848 ◽  
pp. 262-271
Author(s):  
Wen Yan Cheng ◽  
Shi Jia Gu ◽  
Bei Ying Zhou ◽  
Lian Jun Wang ◽  
Wei Luo ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Sintering Temperature ◽  
Holding Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceramic Samples ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Crystal Phases ◽  
Co Doped

A series of ytterbium and erbium co-doped sodium yttrium fluoride (NaYF4:Yb3+, Er3+) ceramics have been successfully prepared by pressureless sintering. The ceramic samples were characterized by X-ray diffraction (XRD), photoluminescence (PL), density and field emission scanning electron microscope (FESEM). The results showed that the phases of the NaYF4:Yb3+, Er3+ ceramic samples transformed when the sintering temperature was changed. The ceramic samples sintered below 600 oC contained both cubic α-NaYF4:Yb3+, Er3+ and hexagonal β-NaYF4:Yb3+, Er3+. The sample sintered at 600oC is the pure hexagonal β-NaYF4:Yb3+, Er3+. When the sintering temperature is above 600 oC, the ceramic samples present the α-NaYF4:Yb3+, Er3+ again. The fluorescence intensity increased firstly and then decreased with the sintering temperature increasing. The luminous intensity of the sample sintered at 600 oC was the highest. The densities of as-prepared ceramic sample increased with the sintering temperature rising. The samples sintered at 600 oC with different holding time possessed the similar crystal phases (β-NaYF4:Yb3+, Er3+) and fluorescence intensity. As the holding time increased, the densities of the samples increased. To obtain more dense ceramics, the ceramics using β-NaYF4:Yb3+, Er3+ powders were prepared by spark plasma sintering (SPS). The maximum relative density reached 97%.

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