Deep submicrometer YAG:Ce phosphor particles with high photoluminescent quantum yield prepared by flame spray synthesis

2017 ◽  
Vol 100 (8) ◽  
pp. 3784-3793 ◽  
Author(s):  
Mario Borlaf ◽  
Roman Kubrin ◽  
Vladimir Aseev ◽  
Alexander Yu Petrov ◽  
Nikolay Nikonorov ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Flame Spray ◽  
Deep Submicrometer ◽  
Flame Spray Synthesis

Photocatalytic Activity of W-Doped TiO2 Nanopowders

2008 ◽  
Vol 11 (1) ◽  
Author(s):  
Katarzyna A. Michalow ◽  
Andri Vital ◽  
Andre Heel ◽  
Thomas Graule ◽  
Felix A. Reifler ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Specific Surface ◽  
Dopant Concentration ◽  
Flame Spray ◽  
Titanium Tetra Isopropoxide ◽  
Flame Spray Synthesis ◽  
One Step ◽  
Tio2 Nanopowders ◽  
Doped Titanium Dioxide

AbstractPolycrystalline tungsten-doped titanium dioxide nanopowders within a dopant concentration of 0-1 at.% were prepared by a one-step flame spray synthesis (FSS). Mixtures of titanium tetra-isopropoxide dissolved in ethanol and tungsten hexacarbonyl solubilized in tetrahydrofuran were used as precursors. The specific surface area (SSA) of the powders was between 40 and 130 m

scholarly journals Hydrogen Sensor Of TiO2-Based Nanomaterials

2015 ◽  
Vol 60 (2) ◽  
pp. 935-940 ◽  
Author(s):  
B. Łysoń-Sypień ◽  
K. Zakrzewska ◽  
M. Gajewska ◽  
M. Radecka
Keyword(s):  
Gas Sensing ◽  
Hydrogen Sensor ◽  
Integrating Sphere ◽  
Flame Spray ◽  
X Ray Diffraction ◽  
Hydrogen Sensing ◽  
Transmission Electron ◽  
Optical Spectrometry ◽  
Flame Spray Synthesis ◽  
Reference Atmosphere

Abstract The aim of this research was to examine gas sensing properties of TiO2 based nanomaterials. Nanopowders of Cr doped TiO2 with constant Specific Surface Area, SSA, were obtained using Flame Spray Synthesis technique, FSS. Nanomaterials were characterized by Brunauer – Emmett – Teller adsorption isotherms, BET, X – ray diffraction, XRD, Transmission Electron Microscopy, TEM, optical spectrometry UV – vis with the use of an integrating sphere as well as impedance spectroscopy. Detection of hydrogen was carried out over the concentration range of 50 - 3000 ppm at the temperatures extending from 200 to 400°C and synthetic air working as a reference atmosphere. As a result of experiments it appeared that incorporation of 5 at.% of Cr into TiO2 improved hydrogen sensing features due to small crystallite size and predominance of rutile polymorphic phase.

scholarly journals Flame Spray Synthesis of VOPO4 Polymorphs

2019 ◽  
Vol 6 ◽  
Author(s):  
Gagan Jodhani ◽  
Fateh Mikaeili ◽  
Pelagia Irene Gouma
Keyword(s):  
Flame Spray ◽  
Flame Spray Synthesis

scholarly journals Nanocrystalline TiO2/SnO2 heterostructures for gas sensing

2017 ◽  
Vol 8 ◽  
pp. 108-122 ◽  
Author(s):  
Barbara Lyson-Sypien ◽  
Anna Kusior ◽  
Mieczylaw Rekas ◽  
Jan Zukrowski ◽  
Marta Gajewska ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Detection Threshold ◽  
Oxygen Adsorption ◽  
Flame Spray ◽  
Nanocrystalline Tio2 ◽  
Water Desorption ◽  
Hydrogen Sensing ◽  
Crystallite Sizes ◽  
Flame Spray Synthesis ◽  
Polymorphic Forms

The aim of this research is to study the role of nanocrystalline TiO2/SnO2 n–n heterojunctions for hydrogen sensing. Nanopowders of pure SnO2, 90 mol % SnO2/10 mol % TiO2, 10 mol % SnO2/90 mol % TiO2 and pure TiO2 have been obtained using flame spray synthesis (FSS). The samples have been characterized by BET, XRD, SEM, HR-TEM, Mössbauer effect and impedance spectroscopy. Gas-sensing experiments have been performed for H2 concentrations of 1–3000 ppm at 200–400 °C. The nanomaterials are well-crystallized, anatase TiO2, rutile TiO2 and cassiterite SnO2 polymorphic forms are present depending on the chemical composition of the powders. The crystallite sizes from XRD peak analysis are within the range of 3–27 nm. Tin exhibits only the oxidation state 4+. The H2 detection threshold for the studied TiO2/SnO2 heterostructures is lower than 1 ppm especially in the case of SnO2-rich samples. The recovery time of SnO2-based heterostructures, despite their large responses over the whole measuring range, is much longer than that of TiO2-rich samples at higher H2 flows. TiO2/SnO2 heterostructures can be intentionally modified for the improved H2 detection within both the small (1–50 ppm) and the large (50–3000 ppm) concentration range. The temperature T max at which the semiconducting behavior begins to prevail upon water desorption/oxygen adsorption depends on the TiO2/SnO2 composition. The electrical resistance of sensing materials exhibits a power-law dependence on the H2 partial pressure. This allows us to draw a conclusion about the first step in the gas sensing mechanism related to the adsorption of oxygen ions at the surface of nanomaterials.

Emulsion Combustion and Flame Spray Synthesis of Zinc Oxide/Silica Particles

2003 ◽  
Vol 5 (1/2) ◽  
pp. 39-46 ◽  
Author(s):  
Takao Tani ◽  
Naoyoshi Watanabe ◽  
Kazumasa Takatori
Keyword(s):  
Zinc Oxide ◽  
Silica Particles ◽  
Flame Spray ◽  
Flame Spray Synthesis

Development and characterization of custom-engineered and compacted nanoparticles as calibration materials for quantification using LA-ICP-MS

2014 ◽  
Vol 29 (6) ◽  
pp. 955-962 ◽  
Author(s):  
Daniel Tabersky ◽  
Norman A. Luechinger ◽  
Michael Rossier ◽  
Eric Reusser ◽  
Kathrin Hametner ◽  
...  
Keyword(s):  
Flame Spray ◽  
Icp Ms ◽  
Nano Material ◽  
Flame Spray Synthesis ◽  
Calibration Materials

Flame spray synthesis was used to produce a reference nano-material with a customized composition for use in LA-ICP-MS.

Phase Evolution of Thermally Treated Amorphous Tricalcium Phosphate Nanoparticles

2008 ◽  
Vol 396-398 ◽  
pp. 595-598 ◽  
Author(s):  
Nicola Döbelin ◽  
Tobias J. Brunner ◽  
Wendelin J. Stark ◽  
Manuel Eggimann ◽  
Martin Fisch ◽  
...  
Keyword(s):  
Tricalcium Phosphate ◽  
Elevated Temperatures ◽  
Particle Growth ◽  
Phase Evolution ◽  
Flame Spray ◽  
Crystallite Growth ◽  
X Ray ◽  
Heat Treated ◽  
Flame Spray Synthesis

X-ray amorphous tricalcium-phosphate nanoparticles (ATCP) produced by flame spray synthesis were heat-treated at temperatures between 500 and 1000 °C and analyzed in situ by X-ray powder diffraction. The main phase occurring after crystallisation at 525 °C was α-TCP, minor phases were identified as β-TCP and hydroxyapatite. More elevated temperatures induced crystallite growth and the transformation of α-TCP into β-TCP. Above 900 °C no α-TCP was traceable anymore. α’-TCP was not observed in the experiment. This study shows that nanoparticulate α-TCP can be obtained by thermal treatment of an amorphous TCP nanoparticle in a temperature range where sintering effects such as particle growth and densification are moderate or nearly negligible.

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