Synthesis and Characterization of WO3/S Core/Shell Nanoparticles by Thermal Evaporation

2014 ◽  
Vol 602-603 ◽  
pp. 51-54 ◽  
Author(s):  
Jing Wen Qian ◽  
Zhi Jian Peng ◽  
Dian Zhong Wu ◽  
Xiu Li Fu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Large Scale ◽  
Thermal Evaporation ◽  
Nano Particles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Core Shell Nanoparticles

WO3 has been widely applied in many fields such as electrochromic window, photocatalyst, and gas-senor. In this paper, WO3/S core/shell nanoparticles were synthesized in high density and large scale on silicon substrates via simple thermal evaporation of WO3 and S powders at 950 °C in a tube furnace. The morphology, composition and structure of the nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy. The results indicate that the nano-particles have a uniform morphology with a diameter in the range of 150-250 nm and well crystalline structure. The growth mechanism of the nanoparticles was also proposed.

Facile Fabrication of Antibacterial Core–Shell Nanoparticles Based on PHMG Oligomers and PAA Networks via Template Polymerization

2014 ◽  
Vol 67 (1) ◽  
pp. 142 ◽  
Author(s):  
You Wei Zhang ◽  
Yan Chen ◽  
Jiong Xin Zhao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Acrylic Acid ◽  
Electrostatic Interactions ◽  
Minimum Size ◽  
Core Shell ◽  
Nanoparticle Dispersion ◽  
Shell Nanoparticles ◽  
Transmission Electron ◽  
Core Shell Nanoparticles

Antibacterial core–shell nanoparticles based on poly(hexamethylene guanidine hydrochloride) (PHMG) oligomers and poly(acrylic acid) (PAA) networks are efficiently fabricated via a facile one-step co-polymerization of acrylic acid and N,N′-methylenebisacrylamide on PHMG templates in aqueous solution. Dynamic light scattering, Fourier-transform infrared spectroscopy, and transmission electron microscopy observations were used to characterize the size, morphology, and structure of the nanoparticles, as well as the interactions between the components. Also, the stability of the nanoparticle dispersion against storage, pH value, salt, and temperature was investigated. The results show that the crosslinked PAA/PHMG nanoparticles are stabilized by electrostatic interactions. The core–shell structure of the nanoparticles was confirmed by transmission electron microscopy observation. The size of the nanoparticles increases substantially with extension of storage or with increase of the salt concentration. The nanoparticle dispersion is stable in a pH range of 2.0–4.0. The size change of the nanoparticles with pH of the medium is parabolic, and the minimum size is reached at pH 3.0. A rise of temperature leads to a slight and recoverable size increase of the nanoparticles. Antibacterial efficiency was evaluated quantitatively against Escherichia coli and Staphylococcus aureus by the plating method according to Standard JC/T 897–2002. The antibacterial activity against these two bacteria are both above 99.0 % at a nanoparticle concentration of 5 mg mL–1. This makes the nanoparticle dispersion a good candidate for the application of antibacterial water-based coatings and textiles coating.

Preparation and Characterization of Nickel(Ni)-Silver(Ag) Core-Shell Nanoparticles for Conductive Pastes

2012 ◽  
Vol 531 ◽  
pp. 211-214 ◽  
Author(s):  
Jun Jie Jing ◽  
Ji Min Xie ◽  
Hui Ru Qin ◽  
Wen Hua Li ◽  
Ming Mei Zhang
Keyword(s):  
Electron Microscopy ◽  
Inductively Coupled Plasma ◽  
Water Solution ◽  
Average Diameter ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Shell Nanoparticles ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Core Shell Nanoparticles

Nickel(Ni)-silver(Ag) core-shell nanoparticles with different shell thickness were synthesized with Ni nanoparticles by liquid phase reduction technique form water solution. The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and inductively coupled plasma spectroscopy (ICP). The results showed that the Ni nanoparticles are in sphere shape and the average diameter is 104nm , the nickel(Ni)-silver(Ag) core-shell nanoparticles has good crystallinity and the thinkness of Ag nanoshells could be effectively controlled by changing the concentration of silver nitrate. The product can be used for nickel-based conductive paste preparation because of the surface character of Ag and the magnetic property of Ni

In situ TEM observation of Au–Cu2O core–shell growth in liquids

Nanoscale ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 10486-10492 ◽  
Author(s):  
Fu-Chun Chen ◽  
Jui-Yuan Chen ◽  
Ya-Hsuan Lin ◽  
Ming-Yu Kuo ◽  
Yung-Jung Hsu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Shell Growth ◽  
Core Shell ◽  
In Situ Tem ◽  
Shell Nanoparticles ◽  
Transmission Electron ◽  
Liquid Cell ◽  
Different Shapes ◽  
Core Shell Nanoparticles

The formation of different shapes Au–Cu2O core–shell nanoparticles was investigated by in situ liquid cell transmission electron microscopy (LCTEM).

Synthesis and Characterization of MoO2 Nanoplates Prepared by Thermal Evaporation of MoO3 and S Powders

2016 ◽  
Vol 697 ◽  
pp. 3-6
Author(s):  
Han Qing Li ◽  
Zhi Jian Peng ◽  
Jing Wen Qian ◽  
Zhen Guang Shen ◽  
Xiu Li Fu
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Thermal Evaporation ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Super Capacitor ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Battery Electrode

MoO2 has been widely used in many fields such as catalyst, gas-senor, super capacitor and Li-ion battery electrode. In this paper, MoO2 nanoplates were synthesized in high density and large scale on silicon substrates via simple thermal evaporation of MoO3 and S powders at 950 °C in a tube furnace. The morphology, composition and structure of the nanoplates were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The results indicate that the as-synthesized nanoplates are of well crystalline structure, and the thickness of these nanoplates is in the range of 100-300 nm. The growth mechanism of the nanoparticles was proposed as a vapor-solid process.

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