Structural investigations and luminescence properties of nanocrystalline europium-doped yttrium silicates prepared by a sol–gel technique

2007 ◽  
Vol 29 (6) ◽  
pp. 585-592 ◽  
Author(s):  
Carla Cannas ◽  
Marina Mainas ◽  
Anna Musinu ◽  
Giorgio Piccaluga ◽  
Stefano Enzo ◽  
...  
Keyword(s):  
Sol Gel ◽  
Luminescence Properties ◽  
Structural Investigations ◽  
Gel Technique

scholarly journals Influence of doping with Co, Cu, Ce and Fe on structure and photocatalytic activity of TiO2 nanoparticles

2018 ◽  
Vol 35 (4) ◽  
pp. 725-732 ◽  
Author(s):  
Damian Wojcieszak ◽  
Michal Mazur ◽  
Danuta Kaczmarek ◽  
Jaroslaw Domaradzki
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Photocatalytic Decomposition ◽  
Structural Investigations ◽  
Anatase Structure ◽  
Aggregation Effect ◽  
Gel Technique ◽  
Average Size

Abstract In this paper, structural and photocatalytic properties of TiO2 nanopowders doped with 1 at.% of cerium, cobalt, cooper and iron have been compared. Nanoparticles were synthesized by sol-gel technique and characterized by SEM, EDS and XRD methods. Moreover, their photocatalytic activity was determined based on decomposition of methyl orange. Results were compared with undoped powder. The structural investigations have revealed that all prepared nanopowders were nanocrystalline and had TiO2-anatase structure. The average size of crystallites was ca. 4 nm to 5 nm. The distribution of the dopant was homogenous in case of all manufactured powders. Moreover, for TiO2 doped with Co, Ce and Cu, aggregation effect was not as large as for TiO2:Fe. The results of photocatalytic decomposition showed that self-cleaning activity of all prepared nanopowders was higher as compared to undoped one. Due to the efficiency of these reactions (after 5 hours) nanopowders can be ordered as: TiO2:Co > TiO2:Ce > TiO2:Cu > TiO2:Fe > TiO2.

Research on Particle Size and Luminescence Properties of GdBaB9O16: Eu3+Phosphor Prepared by Sol-Gel Method

2012 ◽  
Vol 602-604 ◽  
pp. 839-842
Author(s):  
Ying Xie ◽  
Lin Jiu Xiao ◽  
Yong Jie Chen ◽  
Wen Ze Li ◽  
Xiu Juan Geng
Keyword(s):  
Particle Size ◽  
Particle Distribution ◽  
Sol Gel ◽  
Emission Peak ◽  
Luminescence Properties ◽  
Polyethylene Glycols ◽  
Excitation Peak ◽  
Red Phosphors ◽  
Gel Technique ◽  
The Relationship

Gd0.6BaB9O16: Eu3+0.4 red phosphors were prepared by sol-gel technique. The different polyethylene glycols (PEGs) were added to control the particle size ofGd0.6BaB9O16: Eu3+0.4. The particle distribution and the relationship between the particle size and the luminescence properties of the phosphors were investigated. PEGs have no influence on the structure ofGd0.6BaB9O16: Eu3+0.4, but the particle size is changed with different molecular weight of PEGs. And the relative intensity of excitation peak and emission peak ofGd0.6BaB9O16: Eu3+0.4phosphor are reduced by adding PEG, due to the particle size effects.

Preparation and Deposition of Hydroxyapatite on Biomaterials by Sol-Gel Technique-A Review

2013 ◽  
Vol 1 (2) ◽  
pp. 59-69 ◽  
Author(s):  
Sarbjit Kaur ◽  
Niraj Bala ◽  
Charu Khosla
Keyword(s):  
Sol Gel ◽  
Gel Technique

Sol - Gel Technique Applied for Biomaterials Achievement

2011 ◽  
Vol 4 (3) ◽  
pp. 224-237 ◽  
Author(s):  
Aurica P. Chiriac ◽  
Loredana E. Nita ◽  
Iordana Neamtu ◽  
Manuela T. Nistor
Keyword(s):  
Sol Gel ◽  
Gel Technique
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