An Evaluation of Structural, Topographic, Optical, and Temperature-Dependent Electrical Features of Sol–Gel Spin-Coated p-NiO/n-Si Heterojunction

2017 ◽  
Vol 48 (6) ◽  
pp. 3137-3142
Author(s):  
Güven Turgut ◽  
Songül Duman ◽  
Fikriye Şeyma Özcelik
Keyword(s):  
Sol Gel ◽  
Temperature Dependent

scholarly journals Selectivity of Tungsten Oxide Synthesized by Sol-Gel Method Towards Some Volatile Organic Compounds and Gaseous Materials in a Broad Range of Temperatures

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 523 ◽  
Author(s):  
Simonas Ramanavičius ◽  
Milda Petrulevičienė ◽  
Jurga Juodkazytė ◽  
Asta Grigucevičienė ◽  
Arūnas Ramanavičius
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Sol Gel ◽  
Temperature Dependent ◽  
Sensing Systems ◽  
Sensing Material ◽  
Operational Temperature ◽  
Volatile Organic ◽  
Different Gases

In this research, the investigation of sensing properties of non-stoichiometric WO3 (WO3−x) film towards some volatile organic compounds (VOC) (namely: Methanol, ethanol, isopropanol, acetone) and ammonia gas are reported. Sensors were tested at several temperatures within the interval ranging from a relatively low temperature of 60 up to 270 °C. Significant variation of selectivity, which depended on the operational temperature of sensor, was observed. Here, the reported WO3/WO3–x-based sensing material opens an avenue for the design of sensors with temperature-dependent sensitivity, which can be applied in the design of new gas- and/or VOC-sensing systems that are dedicated for the determination of particular gas- and/or VOC-based analyte concentration in the mixture of different gases and/or VOCs, using multivariate analysis of variance (MANOVA).

scholarly journals Temperature-dependent structural behaviour of samarium cobalt oxide

2017 ◽  
Vol 32 (S2) ◽  
pp. S38-S42
Author(s):  
Matthew R. Rowles ◽  
Cheng-Cheng Wang ◽  
Kongfa Chen ◽  
Na Li ◽  
Shuai He ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Cobalt Oxide ◽  
Sol Gel ◽  
Linear Thermal Expansion ◽  
Rietveld Analysis ◽  
Structural Behaviour ◽  
Temperature Dependent ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Sol Gel Synthesis

The crystal structure and thermal expansion of the perovskite samarium cobalt oxide (SmCoO3) have been determined over the temperature range 295–1245 K by Rietveld analysis of X-ray powder diffraction data. Polycrystalline samples were prepared by a sol–gel synthesis route followed by high-temperature calcination in air. SmCoO3 is orthorhombic (Pnma) at all temperatures and is isostructural with GdFeO3. The structure was refined as a distortion mode of a parent $ Pm{\bar 3}m $ structure. The thermal expansion was found to be non-linear and anisotropic, with maximum average linear thermal expansion coefficients of 34.0(3) × 10−6, 24.05(17) × 10−6, and 24.10(18) × 10−6 K−1 along the a-, b-, and c-axes, respectively, between 814 and 875 K.

Temperature-dependent luminescence and energy transfer in Europium and rare-earth-codoped nanostructured sol-gel SiO 2 glasses

1999 ◽  
Author(s):  
Srinivasa Buddhudu ◽  
Makoto Morita ◽  
Hong X. Zhang ◽  
Chan Hin Kam ◽  
Yee Loy Lam ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Sol Gel ◽  
Temperature Dependent

Polycrystalline La0.8Sr0.2GaO3 perovskite synthesized by sol–gel process along with temperature dependent photoluminescence

2017 ◽  
Vol 181 ◽  
pp. 1-7 ◽  
Author(s):  
F. Belkhiria ◽  
F.I.H. Rhouma ◽  
S. Hcini ◽  
M. Daoudi ◽  
H. Gammoudi ◽  
...  
Keyword(s):  
Sol Gel ◽  
Temperature Dependent ◽  
Sol Gel Process ◽  
Temperature Dependent Photoluminescence

scholarly journals Frequency and Temperature Dependent Dielectric Response of Fe3O4 Nano-crytallites

2014 ◽  
Vol 6 (3) ◽  
pp. 399-406 ◽  
Author(s):  
M. Z. Ansar ◽  
S. Atiq ◽  
K. Alamgir ◽  
S. Nadeem
Keyword(s):  
Magnetite Nanoparticles ◽  
Sol Gel ◽  
Dielectric Behavior ◽  
Tangent Loss ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Dielectric Tangent Loss ◽  
Auto Combustion ◽  
Combustion Technique

Magnetite nanoparticles have been prepared by using sol-gel auto combustion technique. The samples are prepared by using different concentrations of fuel. Structural characterization has been done using X-Ray diffraction technique and it was observed that fuel concentration can affect the structural properties of Magnetite nanoparticles. The dielectric properties for all the samples such as dielectric constant (??), dielectric tangent loss (tan ?) and dielectric loss factor (??) have been studied as a function of frequency and temperature in the range 10 Hz–20 MHz  and it was found that these nanoparticles can be used in microwave devices because of their good dielectric behavior. © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i3.17938 J. Sci. Res. 6 (3), 399-406 (2014)

Molecular Basis for a Simple, Specific Test for S Hemoglobin: the Murayama Test

1970 ◽  
Vol 16 (11) ◽  
pp. 945-950 ◽  
Author(s):  
Robert M Nalbandian ◽  
Raymond L Henry ◽  
Bruce M Nichols ◽  
Frank R Camp ◽  
Paul L Wolf
Keyword(s):  
Molecular Basis ◽  
Close Agreement ◽  
Negative Temperature Coefficient ◽  
Sol Gel ◽  
Negative Temperature ◽  
Globin Chain ◽  
Temperature Dependent ◽  
Diagnostic Laboratory ◽  
Specific Test ◽  
Hemoglobin C

Abstract The Murayama test, a new, specific test for S hemoglobin, is based on the molecular mechanism of sickling for S hemoglobin proposed by Murayama [Clin. Chem. 14, 578 (1967)]. The test depends on a feature of molecular structure: hydrophobic bonds formed between interacting tetramers by the no. 6 valine, which is substituted for glutamic acid near the N-terminal end of each β S globin chain. Existence of these particular hydrophobic bonds is manifested in deoxygenated, concentrated hemolysates by reversible sol— gel transformations at 0° and 37°C. In such systems, demonstration of reversible, temperature-dependent sol—gel transformations (a negative temperature coefficient of gelation) is specific for S hemoglobin or the S structural variant, hemoglobin C (Harlem). The test is simple, has clear endpoints, will detect both homozygous and heterozygous S hemoglobin, and is specific. A practical approach is suggested to the precise identification of S and non-S sickling hemoglobins in the diagnostic laboratory. The close agreement between Murayama’s hypothesis for sickling in S hemoglobin and our results with 29 cases of S hemoglobin and 37 controls further support his views.

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