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.

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 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.

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.

Core−Shell Microspherical Ti1-xZrxO2Solid Solution Photocatalysts Directly from Ultrasonic Spray Pyrolysis

2006 ◽  
Vol 110 (39) ◽  
pp. 19323-19328 ◽  
Author(s):  
Yu Huang ◽  
Zhi Zheng ◽  
Zhihui Ai ◽  
Lizhi Zhang ◽  
Xiaoxing Fan ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Core Shell ◽  
Ultrasonic Spray

Preparation of NiO-CuO-MgO fine powders by ultrasonic spray pyrolysis for carbon nanofibers synthesis

2017 ◽  
Vol 684 ◽  
pp. 36-38 ◽  
Author(s):  
Irina V. Krasnikova ◽  
Ilya V. Mishakov ◽  
Yury I. Bauman ◽  
Timofey M. Karnaukhov ◽  
Aleksey A. Vedyagin
Keyword(s):  
Spray Pyrolysis ◽  
Carbon Nanofibers ◽  
Ultrasonic Spray Pyrolysis ◽  
Fine Powders ◽  
Ultrasonic Spray

Synthesis of Carbon Nanofibers from Carbon Particles by Ultrasonic Spray Pyrolysis of Ethanol

2009 ◽  
Vol E92-C (12) ◽  
pp. 1432-1437 ◽  
Author(s):  
Jianhui ZHANG ◽  
Ishwor KHATRI ◽  
Naoki KISHI ◽  
Tetsuo SOGA ◽  
Takashi JIMBO
Keyword(s):  
Spray Pyrolysis ◽  
Carbon Nanofibers ◽  
Ultrasonic Spray Pyrolysis ◽  
Carbon Particles ◽  
Ultrasonic Spray

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.

Sign in / Sign up

Export Citation Format

Share Document