COMBUSTION SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE ALKALINE EARTH ALUMINATE Sr4Al14O25:RE(RE = Eu, Dy, Sm)

2013 ◽  
Vol 12 (04) ◽  
pp. 1350023 ◽  
Author(s):  
V. P. HEDAOO ◽  
V. B. BHATKAR ◽  
S. K. OMANWAR
Keyword(s):  
Alkaline Earth ◽  
Emission Spectra ◽  
Green Emission ◽  
Combustion Method ◽  
Superior Performance ◽  
Synthesis And Characterization ◽  
Photoluminescence Properties ◽  
Red Emission ◽  
Crystalline Nature

Nanoscale phosphors have superior performance characteristics than the bulk phosphors. This paper explains the synthesis and characterization like XRD, FTIR, SEM and photoluminescence properties of nanocrystalline Sr 4 Al 14 O 25 doped with rare earth elements like europium, dysprosium and samarium by combustion method. XRD showed the nanoscale crystalline nature of as-prepared samples. SEM confirmed size of the particle less than 100 nm. Photoluminescent emission spectra showed strong orange red emission at 593 nm for Sr 4 Al 14 O 25: Sm 3+. The green emission of Eu 2+ was observed at around 490 nm for Sr 4 Al 14 O 25: Eu 2+.

Synthesis and Characterization of ZnO Nanowires Using a Simple PVD Approach without Catalysts

2005 ◽  
Vol 475-479 ◽  
pp. 3535-3538 ◽  
Author(s):  
Long Shan Wang ◽  
X. Zhang ◽  
Fan Hao Zeng
Keyword(s):  
Green Emission ◽  
Average Diameter ◽  
Zno Nanowires ◽  
Synthesis And Characterization ◽  
Uv Laser ◽  
Photoluminescence Properties ◽  
Uv Emission ◽  
Evaporation Source ◽  
Strong Green Emission

Two kinds of ZnO nanowires with different morphologies and characters were produced on Si (100) using a new PVD approach by heating and oxidizing Zn powders directly without any catalysts. The nanowires have an average diameter of 80nm (deposited at the evaporation source) and 30nm (deposited downstream of the evaporation source) respectively, and are evenly distributed over an area of > 20mm2. The two nanowires have complete different photoluminescence properties. One has a strong green emission (510nm) with a weak UV emission (380nm). The other has a strong and sharp UV emission (385nm), showing the capability for UV laser emitters.

Synthesis and Characterization of Hematite Nanoparticles as Active Photocatalyst for Water Splitting Application

2013 ◽  
Vol 594-595 ◽  
pp. 73-77 ◽  
Author(s):  
Sze Mei Chin ◽  
Suriati Sufian ◽  
Jeefferie Abd Razak
Keyword(s):  
Surface Area ◽  
Water Splitting ◽  
Combustion Method ◽  
Hydrogen Gas ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Hematite Nanoparticles ◽  
X Ray ◽  
Bet Specific Surface Area

This paper highlights on the hydrogen production through photocatalytic activity by using hematite nanoparticles synthesized from self-combustion method based on different stirring period. The morphologies and microstructures of the nanostructures were determined using Field-Emission Scanning Electron Microscope (FESEM), X-Ray Diffractometer (XRD) and Particle Size Analyser (PSA). Besides that, surface area analyser was used to determine the BET surface area of the hematite samples. The hematite nanocatalyst as-synthesized are proven to be rhombohedral crystalline hematite (α-Fe2O3) with particle diameters ranging from 60-140 nm. The BET specific surface area of hematite samples increased from 5.437 to 7.6425 m2/g with increasing stirring period from 1 to 4 weeks. This caused the amount of hydrogen gas produced from photocatalytic water splitting to increase as well.

Hydrothermal Synthesis and Characterization of Nanocrystalline Gd2Sn2O7:Eu3+ Phosphors

2011 ◽  
Vol 239-242 ◽  
pp. 2851-2854 ◽  
Author(s):  
Jin Yu Yang ◽  
Yu Chang Su ◽  
Zhuo Chen ◽  
Xue Ying Liu
Keyword(s):  
Single Phase ◽  
Concentration Quenching ◽  
Synthesis And Characterization ◽  
Photoluminescence Properties ◽  
Excitation Spectra ◽  
Pyrochlore Type ◽  
Co Precipitation ◽  
Synthesized Materials ◽  
Quenching Phenomenon

Phase-pure Eu3+doped Gd2Sn2O7nanocrystals have been successfully synthesized via a co-precipitation processes combined with hydrothermal treatment. The crystal structure, particle size, morphologies, composition, and photoluminescence properties of the as-synthesized products were investigated by XRD, SEM, TEM, EDS and PL. The samples were single-phase cubic pyrochlore-type nanocrystals with a typical size of about 30 - 60 nm. All the samples exhibited irregular flower like secondary nanostructure assembled by primary nanoparticles. Photoluminescence properties of Gd2Sn2O7:Eu3+were investigated, and the results revealed that the as-synthesized materials displayed intense and prevailing emission located at 580 - 630 nm. The excitation spectra indicated that an energy transfer from Gd3+to Eu3+occurred. Meanwhile, the concentration quenching phenomenon was observed in Gd2Sn2O7:Eu3+nanocrystals.

Synthesis and Characterization of Some Alkaline-Earth-Oxide Nanoparticles

2018 ◽  
Vol 72 (8) ◽  
pp. 890-899 ◽  
Author(s):  
Jitendra Pal Singh ◽  
Weon Cheol Lim ◽  
Sung Ok Won ◽  
Jonghan Song ◽  
Keun Hwa Chae
Keyword(s):  
Alkaline Earth ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles ◽  
Alkaline Earth Oxide

scholarly journals Synthesis and thermal characterization of luminescent hybrid composites based on bisphenol A diacrylate and NVP

2019 ◽  
Vol 138 (6) ◽  
pp. 4463-4473 ◽  
Author(s):  
Renata Łyszczek ◽  
Beata Podkościelna ◽  
Agnieszka Lipke ◽  
Agnieszka Ostasz ◽  
Andrzej Puszka
Keyword(s):  
Bisphenol A ◽  
Lanthanide Complexes ◽  
Hybrid Composites ◽  
Thermal Characterization ◽  
Synthesis And Characterization ◽  
Photoluminescence Properties ◽  
Constant Concentration ◽  
Volatile Products ◽  
Active Diluent

Abstract The synthesis and characterization of luminescent hybrid composites based on bisphenol A glycerolate (1 glycerol/phenol) diacrylate (BPA-Acr) as a cross-linking monomer and N-vinylpyrrolidone (NVP) as an active diluent, in the presence of UV initiator (Irgacure 651), are presented. Eu(III) and Tb(III) carboxylate complexes were added as luminescent components of composites. In their preparation, a constant concentration of the initiator (1%) and the BPA-Acr to NVP (10:3) ratio were applied. The structures of the obtained materials were confirmed by the infrared spectra (ATR-FTIR). Thermal properties of the cross-linked products were determined by different thermal analysis methods in air and nitrogen (TG–DTG–DSC and TG–FTIR). Thermal stability, pathways of thermal decomposition and volatile products of degradation were determined. Photoluminescence properties of the lanthanide complexes and the obtained composites were established. These materials can have the potential application as coatings filtering harmful UV radiation.

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