scholarly journals Facile Synthesis of ZnxCd1-xS Solid Solution Microspheres through Ultrasonic Spray Pyrolysis for Improved Photocatalytic Activity

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Jianhui Huang ◽  
Wenting Lin ◽  
Liyan Xie ◽  
Wingkei Ho
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Spray Pyrolysis ◽  
Solid Solutions ◽  
Molar Fraction ◽  
Ultrasonic Spray Pyrolysis ◽  
Mesoporous Structure ◽  
Practical Applications ◽  
Ultrasonic Spray ◽  
Transmission Electron

Nanocrystal ZnxCd1-xS solid solutions were successfully prepared using a facile and reproducible method of ultrasonic spray pyrolysis with Cd(Ac)2·2H2O, ZnCl2, and thiourea as precursors. Scanning electron microscopy and transmission electron microscopy images show that the prepared particles possess microspherical morphology. The band gaps of the solid solutions can be tuned by changing the constituent stoichiometries of Cd and Zn. The X-ray diffraction peaks gradually shift to small angle, and the absorption edge shifts to long wavelength with increasing Cd molar fraction in the solid solution. The sample prepared at the Cd/Zn ratio of 1 : 1 displays the optimal activity by using the photocatalytic degradation of methyl orange in the aqueous solution as model reactions under visible light irradiation. This study provides an effective route to prepare spherical ternary photocatalysts with mesoporous structure for further investigations and practical applications.

Dried plum-like ZnO assemblies consisted of ZnO nanoparticles synthesized by ultrasonic spray pyrolysis

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040005 ◽  
Author(s):  
Congzhi Zhang ◽  
Tao Han ◽  
Wei Wang ◽  
Jin Zhang
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Field Emission ◽  
Zno Nanoparticles ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Ultrasonic Spray ◽  
Transmission Electron

Dried plum-like ZnO assemblies consisting ZnO nanoparticles were synthesized by an ultrasonic spray pyrolysis method (USP). ZnO assemblies were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS) and field-emission transmission electron microscopy (TEM). The results show the size of ZnO assemblies is in the range of 300–870 nm, and that of ZnO nanoparticles is from 33 nm to 39 nm. The microstructure and size of ZnO assemblies were successfully controlled by the concentration of the precursor solution.

Sintering and Dielectric Properties of Ba(Mg1/3Ta2/3)O3 Particle Prepared by Spray Pyrolysis

2008 ◽  
Vol 388 ◽  
pp. 245-248 ◽  
Author(s):  
Hiroki Yamada ◽  
Takashi Okawa ◽  
Takashi Ogihara
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Nano Particles ◽  
Ultrasonic Spray ◽  
Transmission Electron ◽  
Powder Particles ◽  
Average Size ◽  
Micrometer Size ◽  
20 Nm

Ba(Mg1/3Ta2/3)O3 (BMT) powders were successfully prepared by ultrasonic spray pyrolysis from an aqueous solution of Ba, Mg and Ta. The particles characteristics of BMT nano-sized powders were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). As-prepared powder particles had a sub-micrometer size with a narrow distribution. Transmission electron microscopy (TEM) observation revealed that the average size of the BMT nano-particles was around 20 nm, and that these particles were aggregated. The dielectric constant (r) of 23.2 and the Q・f of 98,300 were obtained at 1550°C by a spray pyrolysis.

scholarly journals Tuning the Morphology of ZnO Nanostructures with the Ultrasonic Spray Pyrolysis Process

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 569 ◽  
Author(s):  
Elif Emil ◽  
Gözde Alkan ◽  
Sebahattin Gurmen ◽  
Rebeka Rudolf ◽  
Darja Jenko ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Ultrasonic Spray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Zno Particles ◽  
One Step ◽  
Spray Pyrolysis Process ◽  
The One

Nanostructured zinc oxide (ZnO) particles were synthesized by the one step Ultrasonic Spray Pyrolysis (USP) process from nitrate salt solution (Zn(NO3)2·6H2O). Various influential parameters, from Zn(NO3)2·6H2O concentrations (0.01875–0.0375 M) in the initial solution, carrier gas (N2) flow rates (0.5–0.75 L/min) to reaction temperature (400–800 °C), were tested to investigate their role on the final ZnO particles’ morphology. For this purpose, Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM) and (Selected Area Electron Diffraction) SAED techniques were used to gain insight into how the ZnO morphology is dependent on the USP process. It was revealed that, by certain parameter selection, different ZnO morphology could be achieved, from spherical to sphere-like structures assembled by interwoven nanoplate and nanoplate ZnO particles. Further, a more detailed crystallographic investigation was performed by XRD and Williamson-Hall (W-H) analysis on the ZnO with unique and non-typical planar morphology that was not reported before by USP synthesis. Moreover, for the first time, a flexible USP formation model was proposed, ending up in various ZnO morphologies rather than only ideal spheres, which is highly promising to target a wide application area.

NANOSTRUCTURED ZrO2 POWDER SYNTHESIZED BY ULTRASONIC SPRAY PYROLYSIS

2007 ◽  
Vol 14 (05) ◽  
pp. 915-919 ◽  
Author(s):  
JELENA P. MARKOVIC ◽  
DRAGANA JUGOVIC ◽  
MIODRAG MITRIC ◽  
DARKO MAKOVEC ◽  
SLOBODAN K. MILONJIC ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Colloidal Dispersion ◽  
Spray Pyrolysis Method ◽  
Nanostructured Particles ◽  
Ultrasonic Spray ◽  
Transmission Electron ◽  
Primary Particles ◽  
The Mean

The synthesis of nanostructured zirconia particles from aqueous colloidal dispersion of zirconia (zirconia sol) was carried out by ultrasonic spray pyrolysis method. The morphology of these nanostructured particles was characterized by scanning electron microscopy and transmission electron microscopy. The synthesized particles are spherical in shape with the avarage size of 400 nm, consisting of smaller primary particles, with the mean crystallite size of 7 nm. The tetragonal phase was confirmed by both X-ray and electron diffraction measurements.

scholarly journals Synthesis of CdIn2S4Microsphere and Its Photocatalytic Activity for Azo Dye Degradation

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Jianhui Huang ◽  
Wei Lin ◽  
Jianqin Chen
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Diffuse Reflectance Spectroscopy ◽  
Dye Degradation ◽  
Ultrasonic Spray Pyrolysis ◽  
Mesoporous Structure ◽  
X Ray Diffraction ◽  
Ultrasonic Spray ◽  
Transmission Electron

CdIn2S4was prepared by ultrasonic spray pyrolysis. The prepared CdIn2S4was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FSEM), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), and N2-sorption techniques. Aqueous photocatalytic activity was evaluated by the decomposition of methyl orange under visible light irradiation. The results indicate that the prepared CdIn2S4has spherical morphology with mesoporous structure which can efficiently degrade methyl orange in water. The sample prepared at 500°C exhibits the optimized photocatalytic activity.

scholarly journals Synthesis of Ce1−xPdxO2−δ Solid Solution in Molten Nitrate

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 640
Author(s):  
Hideaki Sasaki ◽  
Keisuke Sakamoto ◽  
Masami Mori ◽  
Tatsuaki Sakamoto
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Solid Solutions ◽  
Photoelectron Spectroscopy ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Co Precipitation ◽  
Ionic States

CeO2-based solid solutions in which Pd partially substitutes for Ce attract considerable attention, owing to their high catalytic performances. In this study, the solid solution (Ce1−xPdxO2−δ) with a high Pd content (x ~ 0.2) was synthesized through co-precipitation under oxidative conditions using molten nitrate, and its structure and thermal decomposition were examined. The characteristics of the solid solution, such as the change in a lattice constant, inhibition of sintering, and ionic states, were examined using X-ray diffraction (XRD), scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM−EDS), transmission electron microscopy (TEM)−EDS, and X-ray photoelectron spectroscopy (XPS). The synthesis method proposed in this study appears suitable for the easy preparation of CeO2 solid solutions with a high Pd content.

Synthesis of Nanocrystalline Ag-Cu Supersaturated Solid Solution by Mechanical Alloying

2010 ◽  
Vol 92 ◽  
pp. 271-276 ◽  
Author(s):  
Liang Feng Li ◽  
Tai Qiu ◽  
Jian Yang ◽  
Yong Bao Feng
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Mechanical Alloying ◽  
Solid Solutions ◽  
Supersaturated Solid Solution ◽  
Main Peak ◽  
Rich Phase ◽  
Transmission Electron ◽  
Supersaturated Solid Solutions ◽  
Xrd Patterns

Nanocrystalline Ag-28Cu supersaturated solid solution is prepared by mechanical alloying (MA) using a planetary ball mill. The mechanical alloyed powders are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and differential scanning calorimeter (DSC). XRD patterns show that the main peak of Ag-28Cu supersaturated solid solution exists at about 2θ=39° when the milling time is 30h. HRTEM images show that the grain sizes of as-prepared solid solutions have distributions from 10nm to 15nm. The interplanar spacing of (111) plane for fcc Ag-28Cu supersaturated solid solution is about 2.24Å. DSC measurement result indicates that the melting temperature of Ag-28Cu supersaturated solid solution is 783.8°C. The Ag(Cu) supersaturated solid solutions are in metastable state and they will be transformed into Ag-rich phase and Cu-rich phase simultaneously by annealing at 215°C- 415°C.

scholarly journals Fabrication of Bi-DopedTiO2Spheres with Ultrasonic Spray Pyrolysis and Investigation of Their Visible-Light Photocatalytic Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Jianhui Huang ◽  
Wahkit Cheuk ◽  
Yifan Wu ◽  
Frank S. C. Lee ◽  
Wingkei Ho
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Spray Pyrolysis ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Ultrasonic Spray Pyrolysis ◽  
X Ray ◽  
Ultrasonic Spray ◽  
Doped Titania

Bismuth-doped TiO2submicrospheres were synthesized by ultrasonic spray pyrolysis. The prepared bismuth-doped titania was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), and X-ray photoelectron spectroscopy (XPS). Aqueous photocatalytic activity was evaluated by the decomposition of methyl orange under visible-light irradiation. The results indicate that doping of bismuth remarkably affects the phase composition, crystal structure, and the photocatalytic activity. The sample with 2% Bi exhibits the optimum photocatalytic activity.

Evidence for Instability in Pb1-x EuxTe Alloys

1987 ◽  
Vol 103 ◽  
Author(s):  
L. Salamanca-Young ◽  
M. Wuttig ◽  
D. L. Partin ◽  
J. Heremans
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Transmission Electron Microscopy ◽  
Molecular Beam Epitaxy ◽  
Spinodal Decomposition ◽  
Solid Solutions ◽  
Lattice Spacing ◽  
Molecular Beam ◽  
Transmission Electron ◽  
Modulated Structures

ABSTRACTWe have used transmission electron microscopy to study the structure of Pb1-xEuxTe alloys grown by molecular beam epitaxy. We have observed ordered solid solutions of the Pb1-x EuxTe alloys as well as spinodal decomposition for 0.35≤x<0.75. The spinodal decomposition corresponds to a modulation of both the composition and the lattice spacing of the Pb1-x EuxTe alloy. These modulated structures have periodicities of ∼18Å along the <111> and <110> directions and indicate that the solid solution of Pb1-x Eux Te is unstable in this range of compositions.

scholarly journals Synthesis of Core-Shell Si/Carbon Nanofibers on Silicon Substrates by Ultrasonic Spray Pyrolysis

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Jianhui Zhang ◽  
Naoki Kishi ◽  
Tetsuo Soga ◽  
Takashi Jimbo ◽  
Takayoshi Tanji
Keyword(s):  
Spray Pyrolysis ◽  
Carbon Nanofibers ◽  
Substrate Surface ◽  
Ultrasonic Spray Pyrolysis ◽  
Core Shell ◽  
Silicon Substrates ◽  
The Core ◽  
Ultrasonic Spray ◽  
Transmission Electron ◽  
Solid Liquid

We synthesized the core-shell Si/carbon nanofibers with diameters of 200–300 nm using ultrasonic spray pyrolysis with a phosphorus/ethanol mixture. High-resolution transmission electron microscopy (HRTEM) and energy-dispersive spectroscopy (EDS) investigations confirmed the core-shell structure, which consisted of a core of Si and a shell of amorphous carbon. The phosphorus atoms corroded the entire silicon substrate surface, and the Si-P liquid-catalyzed the solid-liquid-solid mechanism is proposed to explain the growth of the core-shell Si/carbon nanofibers.

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