scholarly journals Synthesis of Eu2+ and Dy3+ Doped Strontium Aluminates and their Properties

2016 ◽  
Vol 721 ◽  
pp. 311-315
Author(s):  
Laura Rozenberga-Voska ◽  
Jānis Grabis ◽  
Aleksejs Zolotarjovs
Keyword(s):  
Phase Composition ◽  
Citric Acid ◽  
Specific Surface ◽  
Crystallite Size ◽  
Surface Area ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Strontium Aluminate ◽  
Solution Combustion ◽  
Solution Combustion Method

Strontium aluminate phosphors were synthesized by the solution combustion method using citric acid, urea or glycine as reducing agent and europium and dysprosium as dopants. The content of both dopants was in the range of 1 – 2 mol%. Dependence of phase composition, crystallite size and specific surface area on calcinations temperature, used reducing agents and dopants were determined. Luminescent properties of the calcinated at 1300 °C powders contained SrAl2O4 (90 %) and Sr4Al24O25 (10%) phases with crystallite size of 80 nm were determined.

Bi2WO6 Nanoparticles Prepared by Combustion Synthesis with Different Fuels and their Photocatalytic Activity

2014 ◽  
Vol 604 ◽  
pp. 93-101
Author(s):  
Maris Kodols ◽  
Sabine Didrihsone ◽  
Janis Grabis
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Citric Acid ◽  
Ethylene Glycol ◽  
Specific Surface ◽  
Crystallite Size ◽  
Combustion Synthesis ◽  
Surface Area ◽  
Specific Surface Area ◽  
Solution Ph

The influence of glycine, glycerine, ethylene glycol and citric acid fuel and their ratio to NO3- on formation and dispersity of Bi2WO6 nanoparticles prepared by combustion synthesis has been studied. The pure crystalline Bi2WO6 with specific surface area 24,8 m2/g and crystallite size of 28 nm was obtained by using glycerine as fuel at its ratio to NO3- of 0,67. The photocatalytic activity of the prepared Bi2WO6 in degradation of methylene blue depended on its specific surface area of samples and solution pH.

Highly recyclable Ti0.97Ni0.03O1.97 catalyst coated on cordierite monolith for efficient transformation of arylboronic acids to phenols and reduction of 4-nitrophenol

2021 ◽  
Author(s):  
prasanna b ◽  
K M Usha ◽  
M. S. Hedge
Keyword(s):  
Crystallite Size ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Arylboronic Acids ◽  
Tio2 Catalyst ◽  
Efficient Transformation

A stable Ni2+ substituted TiO2 catalyst (Ti0.97Ni0.03O1.97) has been synthesized by solution combustion method with an average crystallite size of 7.5 nm. Ti1-xNixO2-x (x = 0.01 - 0.06) crystallize in...

scholarly journals Electrocatalytic Properties of a BaTiO3/MWCNT Composite for Citric Acid Detection

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 49
Author(s):  
Siraprapa Pitiphattharabun ◽  
Nicha Sato ◽  
Gasidit Panomsuwan ◽  
Oratai Jongprateep
Keyword(s):  
Citric Acid ◽  
Electrocatalytic Activity ◽  
Combustion Method ◽  
Oxidation Reactions ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Multiwalled Carbon ◽  
Submicron Scale ◽  
Good Potential ◽  
Voltammetric Measurements

Although barium titanate (BaTiO3) shows prominent dielectric properties for fabricating electronic devices, its utilization in electrochemical applications is limited. Thus, this study examined the potential of a BaTiO3-based composite in the detection of a food additive, i.e., citric acid. First, a submicron-scale BaTiO3 powder was synthesized using the solution combustion method. Then, a BaTiO3/multiwalled carbon nanotube (MWCNT) composite was hydrothermally synthesized at BaTiO3:MWCNT mass ratios of 1:1 and 2:1. This composite was used as a working electrode in a nonenzymatic sensor to evaluate its electrocatalytic activity. Cyclic voltammetric measurements revealed that the BaTiO3/MWCNT composite (2:1) exhibited the highest electrocatalytic activity. Reduction reactions were observed at applied voltages of approximately 0.02 and −0.67 V, whereas oxidation reactions were detected at −0.65 and 0.47 V. With acceptable sensitivity, decent selectivity, and fair stability, the BaTiO3/MWCNT composite (2:1) showed good potential for citric acid detection.

Synthesis of Nano Alumina by a Novel Combustion Method

2013 ◽  
Vol 829 ◽  
pp. 126-130
Author(s):  
Navid Elahipanah ◽  
Saeed Heshmati-Manesh
Keyword(s):  
Ammonium Nitrate ◽  
Crystallite Size ◽  
Grain Growth ◽  
Combustion Method ◽  
Alumina Nanoparticles ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Nano Alumina ◽  
Alumina Particles ◽  
Crystallite Sizes

nano Al2O3 powders have been synthesized by a solution combustion method (SCS) using glycine as a fuel and ammonium nitrate as an extra oxidizer. The effectiveness and influence of oxidizer/fuel ratio and the water contetnt of the solution on the crystallite size and characteristics of alumina particles was investigated respectively. As-synthesized powders were γ-alumina due to calcination of samples at 900 ̊C for 2 hours. Also, Results demonstrated that the alumina nanoparticles obtained from φ=1.8 had crystallite sizes around 65 nm which is less than other values of φ, due to evolution of larg amounts of gases which inhibits grain growth and less adiabatic temperature during the process. Also, it was concluded that the more the water content of the solution, the less the crystallinity and crystallite sizes of the products as a result of decreased adiacatic temperature.

Effect of Bi3+ ion concentration on crystal structure and luminescent properties of blue–green-emitting Y2O3:Bi3+ phosphors

2020 ◽  
Vol 13 (07) ◽  
pp. 2050036
Author(s):  
Qian Li ◽  
Biao Zhang ◽  
Zhilei Wei ◽  
Miao He ◽  
Hailong Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Ion Concentration ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Light Emitting ◽  
Broadband Emission ◽  
White Light Emitting Diodes

Blue–green-emitting Y2O3 : [Formula: see text]Bi[Formula: see text] ([Formula: see text] = 0.25–1.50 mol.%) phosphors were synthesized by a solution combustion method followed by high temperature annealing. The effect of Bi[Formula: see text] ion concentration on the crystal structure and photoluminescence performance of the phosphors were investigated. The results show that the cell parameter and cell volume of Y2O3host were increased with the Bi[Formula: see text] concentration, and all the phosphor powders exhibited porous lamellar structure with the width of [Formula: see text]500 nm. The emission spectra of the phosphors ([Formula: see text] = 335 nm) consist of three broadband emission spectra centered at 370 nm (3A[Formula: see text]A[Formula: see text], 410 nm (3E[Formula: see text]A[Formula: see text] and 486 nm (3B [Formula: see text]A), respectively. The phosphor exhibited the optimal luminescence performance at [Formula: see text]= 0.50% and the dipole–dipole and quadrupole–quadrupole interactions among Bi[Formula: see text] ions could lead to the concentration quenching. The color coordinates of Y2O3:0.50%Bi[Formula: see text] were (0.1595, 0.2250), indicating that the as-synthesized blue–green phosphors have a broad application prospect in the field of white light-emitting diodes.

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