Effect of Temperature on the Purity, Particle Size and Morphology of Fe2O3 Nanomaterials

2014 ◽  
Vol 895 ◽  
pp. 305-308 ◽  
Author(s):  
Abdul Rahman Noor Azreen ◽  
Norlida Kamarulzaman ◽  
Nurhanna Badar ◽  
Mustaffa Nur Amalina ◽  
Kamarudin Norashikin
Keyword(s):  
Effect Of Temperature ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Xrd Pattern ◽  
Weak Organic Acid ◽  
Irregular Shapes ◽  
Three Samples ◽  
Different Temperatures ◽  
Particle Size And Morphology ◽  
Size And Morphology

Iron Oxide, Fe2O3, has extensively been studied by many researchers because of their important uses for various applications such as magnetic storages, catalysts, anode, gas sensors and biomedical applications. In our work, Fe2O3 have been synthesized via a new self-propagating combustion (SPC) route using a weak organic acid as an oxidant. The precursor was annealed at three different temperatures. Three samples of Fe2O3 heated at 300 °C, 600 °C and 800 °C for 24 hours were characterized using X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). The XRD pattern confirms that the crystal structure for both 600 °C and 800 °C samples are rhombohedral while for the 300 °C sample, rhombohedral and cubic phases are present. The SEM images showed that the 300 °C and 600 °C materials have irregular shapes. For the 800 °C sample the materials seem to be more crystalline with individual polyhedral shapes.

Electrical Properties of Copper Oxide Nanoparticles

2015 ◽  
Vol 30 ◽  
pp. 1-8 ◽  
Author(s):  
Suresh Sagadevan ◽  
Priya Murugasen
Keyword(s):  
Copper Oxide ◽  
Copper Oxide Nanoparticles ◽  
Cuo Nanoparticles ◽  
Dielectric Constants ◽  
X Ray Diffraction ◽  
Low Frequencies ◽  
Plasma Energy ◽  
Different Temperatures ◽  
Particle Size And Morphology ◽  
Size And Morphology

Copper Oxide (CuO) nanoparticles were synthesized by the wet chemical method. The crystal structure and grain size of the particles were determined, using X-ray diffraction (XRD). The particle size and morphology were studied using the scanning electron microscope (SEM). The dielectric properties of CuO nanoparticles were carried out at different temperatures. The variation of the dielectric constant and dielectric loss were studied. The dielectric constants of the CuO nanoparticles are high at low frequencies, and decrease rapidly when the frequency is increased. Further, electronic properties like valence electron plasma energy, Penn gap, Fermi energy and electronic polarizability of the CuO nanoparticles, were estimated.

Effect of Temperature and Synthesis of CuO Nanostructures on Cu Plate by Thermal Method

2013 ◽  
Vol 634-638 ◽  
pp. 2160-2162 ◽  
Author(s):  
Benjara Supakosl ◽  
Vatcharinkorn Mekla ◽  
Chakkaphan Raksapha
Keyword(s):  
Thermal Evaporation ◽  
Metal Plate ◽  
Effect Of Temperature ◽  
Thermal Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
Xrd Pattern ◽  
X Ray ◽  
20 Nm

CuO nanostructures were synthesized by thermal evaporation method using Cu metal plate in air at temperatures ranging from 400 to 600 C for 6 h. The CuO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy, FE-SEM. X-ray diffraction, XRD pattern showed the bicrystal nanostructure of CuO and Cu2O. FE-SEM images indicated that the nanowires depended on temperatures. The diameter of Cuo nanowires varies from 10 nm to 20 nm and length of several 5 micrometers.

Synthesis of Li2Fe0.5Mn0.5SiO4/C as Cathode Material for Lithium-Ion Batteries Using Amorphous Li2SiO3

2015 ◽  
Vol 1120-1121 ◽  
pp. 132-136
Author(s):  
Pavel Novikov ◽  
Alexey Silin ◽  
Qing Sheng Wang ◽  
Anatoliy Popovich
Keyword(s):  
Cathode Material ◽  
Theoretical Data ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Orthorhombic Unit Cell ◽  
Sem Images ◽  
X Ray ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Li Content

A phase-pure cathode material (Li2Fe0.5Mn0.5SiO4/C) was successfully prepared by a solid-state reaction. Initially, components used amorphous Li2SiO3obtained from a liquid phase by solidification, FeC2O4*2H2O, MnC2O4*2H2O and glucose as a carbon source. The structure of the prepared cathode material was investigated by X-ray diffraction (XRD), the content of Fe, Mn, Si by Energy-dispersive X-ray spectroscopy (EDX) method, Li content by atomic absorption spectroscopy (AAS), the particle size and morphology by scanning electron microscopy (SEM). XRD data show that the sample on the basis of orthorhombic unit cell can be attributed to Pmn21space group. An analysis of SEM images showed average particles size of about 250 nm. Other results obtained (EDX, AAS) correspond approximately to the theoretical data. Electrochemical performance of the cathode material was gained from cycling between 1.5-4.8V. Discharge capacity after the first cycle reached 220 mAh/g.

scholarly journals Effects of sintering temperature on sensing properties of WO 3 and Ag-WO 3 electrode for NO 2 sensor

2018 ◽  
Vol 5 (10) ◽  
pp. 171691 ◽  
Author(s):  
Rui Lu ◽  
Xiaoling Zhong ◽  
Shiguang Shang ◽  
Shan Wang ◽  
Manling Tang
Keyword(s):  
Particle Size ◽  
Calcination Temperature ◽  
Gas Sensing ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Different Temperatures ◽  
Size And Morphology

Pure WO 3 and Ag-WO 3 (mixed solid solutions Ag with WO 3 ) have been successfully synthesized by sol-gel method and the influences of calcination temperature on the particle size, morphology of the WO 3 and Ag-WO 3 nanoparticles were investigated. Powder X-ray diffraction results show that the hexagonal to monoclinic phase transition occurs at calcination temperature varying from 300°C to 500°C. SEM images show that calcination temperature plays an important role in controlling the particle size and morphology of the as-prepared WO 3 and Ag-WO 3 nanoparticles. The NO 2 gas sensing properties of the sensors based on WO 3 and Ag-WO 3 nanoparticles calcined at different temperatures were investigated and the experimental results exhibit that the gas sensing properties of the Ag-WO 3 sensors were superior to those of the pure WO 3 . Especially, the sensor based on Ag-WO 3 calcined at 500°C possessed larger response, better selectivity, faster response/recovery and better longer-term stability to NO 2 than the others at relatively low operating temperature (150°C).

Simple Thermal Decompose Method for Synthesis of Nickel Disulfide Nanostructures

2016 ◽  
Vol 35 (10) ◽  
pp. 1017-1019 ◽  
Author(s):  
Hamideh Seyghalkar ◽  
Mohammad Sabet ◽  
Masoud Salavati-Niasari
Keyword(s):  
Nickel Complex ◽  
Steric Effect ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Surface Purity ◽  
Ft Ir ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Scanning Electron

AbstractIn this work, a simple thermal decompose method was served to synthesize NiS2 nanostructures via a nickel complex. Also polyethylene glycol (PEG) was used as surfactant to increase the steric effect around nanostructure surfaces and decrease the particles size. The product was characterized with different analysis methods. The crystal structure of the product was studied by X-ray diffraction (XRD) pattern. The particle size and morphology were investigated by scanning electron microscopy (SEM). To study the nanostructures surface purity, Fourier transform infrared spectroscopy (FT-IR) was used. And finally to study the optical properties of the product photoluminescence (PL) spectroscopy was served.

Effect of Temperature and Synthesis of ZnO Nanostructures on Zn Plate by Thermal Method

2013 ◽  
Vol 634-638 ◽  
pp. 2163-2165
Author(s):  
Oamphon Thongteel ◽  
Vatcharinkorn Mekla ◽  
Udom Tipparach
Keyword(s):  
Metal Plate ◽  
Effect Of Temperature ◽  
Thermal Method ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
Xrd Pattern ◽  
X Ray ◽  
Metal Plates

ZnO nanostructures were synthesized by thermal evaporation method using Zn metal plate in air. The Zn metal plates were frozen at -10 C, before into the furnace at a temperature ranging from 300 to 420 C for 15 minutes. The ZnO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy( FE-SEM) and X-ray diffraction( XRD) pattern showed the crystal nanostructure of ZnO. FE-SEM images indicated that the nanowires were depended on temperatures. The diameter of ZnO nanowires werevaried from 50 nm to 70 nm and length of several 100 micrometers.

Synthesis and Characterization of Calcium Tartrate Dihydrate Nanoparticles

2015 ◽  
Vol 14 (04) ◽  
pp. 1550013 ◽  
Author(s):  
Urvisha Tarpara ◽  
Poorvesh Vyas ◽  
Mihir J. Joshi
Keyword(s):  
Average Crystallite Size ◽  
Powder Xrd ◽  
Xrd Pattern ◽  
Crystalline Materials ◽  
Transmission Electron ◽  
Calcium Tartrate ◽  
Particle Size And Morphology ◽  
Wet Chemical ◽  
Size And Morphology

Calcium tartrate finds various applications. In the present study, calcium tartrate nanoparticles were synthesized by wet chemical method using surfactant mediated approach. The powder XRD pattern revealed the typical broadening of peaks indicating the nanostructured nature. The average crystallite size was calculated by applying the Scherrer's formula to powder XRD pattern and was found in the range of 22.8–23.9 nm. The particle size and morphology of the synthesized nanoparticles was confirmed by using transmission electron microscopy (TEM). FTIR spectroscopy was used to confirm the presence of various functional groups. From TGA, it was found that calcium tartrate nanoparticles remained stable up to 120°C and were having two water molecules associated with them. The results are compared with the bulk crystalline materials available in the literature.

scholarly journals Single-Cell Tests to Explore the Reliability of Sofc Installations Operating Offshore

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1624
Author(s):  
Nelson Thambiraj ◽  
Ivar Waernhus ◽  
Crina Suciu ◽  
Arild Vik ◽  
Alex C. Hoffmann
Keyword(s):  
Cell Structure ◽  
Oxygen Depletion ◽  
X Ray Diffraction ◽  
Short Term ◽  
Sem Images ◽  
Cathode Degradation ◽  
Air Supply ◽  
Different Temperatures ◽  
Effect Of Oxygen

This paper studies the robustness of off-shore solid oxide fuel cell (SOFC) installations and the nature and causes of possible cell degradation in marine environments. Two important, cathode-related, impediments to ensuring SOFC reliability in off-shore installations are: cathode degradation due to salt contamination and oxygen depletion in the air supply. Short-term and long-term tests show the effect of salt contamination in the cathode feed on cell performance, and reveal the underlying cause of the degradation seen. SEM/X-ray Diffraction/(XRD) analyses made it possible to identify salt taken up in the cathode microstructure after the short-term testing while the macroscopic cell structure remained intact after the short-term tests. The long-term degradation was found to be more severe, and SEM images showed delamination at the cathode/electrolyte interface with salt present, something that was not seen after long-term testing without salt. The effect of oxygen depletion on the performance was also determined at three different temperatures using I-V curves.

Chemical Precipitation Synthesis of Nano-Crystalline Mg(OH)2

2012 ◽  
Vol 1481 ◽  
pp. 45-52
Author(s):  
A. Medina ◽  
L. Béjar ◽  
G. Herrera-Pérez
Keyword(s):  
Fourier Transform ◽  
Synthesis Method ◽  
Chemical Precipitation ◽  
X Ray Diffraction ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Particle Size And Morphology ◽  
Precipitation Synthesis ◽  
Size And Morphology ◽  
Analytical Tools

ABSTRACTMagnesium hydroxide (Mg(OH)2) nanoparticles were synthesized by chemical precipitation synthesis method. The influence of the nano-sized Mg(OH)2 on the structural modification was evaluated. The formation of Mg(OH)2 crystals were evaluated by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The particle size and morphology of Mg(OH)2was confirmed by high resolution transmission electron microscopy (HRTEM). The crystalline structure of nanoparticles was characterized by fast Fourier transform (FFT) and X-Ray diffraction (XRD), like analytical tools.

Sinterability of 8 mol% Yttria Stabilized Zirconia

2018 ◽  
Vol 280 ◽  
pp. 102-108
Author(s):  
Tinesha Selvaraj ◽  
Johar Banjuraizah ◽  
S.F. Khor ◽  
M.N. Mohd Zainol
Keyword(s):  
Low Cost ◽  
Crystal Structure Analysis ◽  
Yttria Stabilized Zirconia ◽  
Holding Time ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Holding Period ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Sintering Behaviour

The sintering behaviour of low cost 8 mol% yttria stabilized zirconia powders has been studied. The effect of sintering holding time of the sintered granulated and milled 8YSZ were determined using density measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The elemental composition, particle size and morphology of the as-received 8YSZ powder and proceed for milling was investigated. 48 hours of ball milling on granulated 8YSZ resulted rises in specific surface area and sintered at 1550°C with the various period of time (4, 5, 6 and 7 hours). The milled 8YSZ sample with 5h sintering holding period coded as F5, sintering activity improved and the relative density came up to 98.3%. But then, granulated 8YSZ achieved only 62.7% with 5 hours holding time. Crystal structure analysis for milled 8YSZ powder consists of 59.6% of cubic ZrO2 phase, 40.1% of tetragonal ZrO2 and 0.3% of monoclinic ZrO2. Meanwhile, granulated 8YSZ indicated low content in cubic ZrO2 but high amount in monoclinic ZrO2 phase. In brief, low cost 8YSZ reached higher densification of 98% successfully.

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