Synthesis of TiO2@Ag Nano-Composite Particles Using Pulsed Laser Gas Phase Evaporation-Liquid Collection

2014 ◽  
Vol 670-671 ◽  
pp. 22-25 ◽  
Author(s):  
Sui Yuan Chen ◽  
Jin Huan Wang ◽  
Xian Zhou ◽  
Jing Liang ◽  
Chang Sheng Liu
Keyword(s):  
Liquid Phase ◽  
Gas Phase ◽  
Shell Structure ◽  
Energy Dispersive Spectrometer ◽  
Pulsed Laser ◽  
Core Shell ◽  
Synthesis Mechanism ◽  
Synthesis Time ◽  
Nanocomposite Particles ◽  
Core Shell Structure

The targets are micron-sized TiO2 powders and micron-sized Ag powders, TiO2@Ag nanocomposite particles with core-shell structure were synthesized by pulsed laser gas phase evaporation-liquid phase collecting method. The morphology, structure and synthesis mechanism of the samples were studied by means of transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), and X-ray diffraction technique (XRD). The results show that the pure TiO2 nanoparticles sol was firstly prepared as liquid phase collecting system using gas phase evaporation-liquid phase collecting method; then, the target was changed using Ag, and TiO2 @ Ag nanocomposite particles with core-shell structure, which are spherical or ellipsoidal, were successfully synthesized under certain conditions of laser synthesis parameters; the diameters of most TiO2@Ag nanocomposite particles covering synthesized after 2h range from 15nm to 35nm, the diameters of most TiO2 @Ag nanocomposite particles covering synthesized after 4h range from 25nm to 50nm, and the size of nanocomposite particles increases with the increase of covering synthesis time; TiO2 nanoparticles synthesized previously in liquid phase function as crystallized cores, while Ag atoms and their clusters are adsorbed to TiO2 surfaces and surround the surfaces to form TiO2 @ Ag nanocomposite particles.

Spectroscopic evidence of a core–shell structure in the earlier formation stages of Au–Ag nanoparticles by pulsed laser ablation in water

2008 ◽  
Vol 457 (4-6) ◽  
pp. 386-390 ◽  
Author(s):  
Giuseppe Compagnini ◽  
Elena Messina ◽  
Orazio Puglisi ◽  
Rosario Sergio Cataliotti ◽  
Valeria Nicolosi
Keyword(s):  
Laser Ablation ◽  
Shell Structure ◽  
Ag Nanoparticles ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Core Shell ◽  
Spectroscopic Evidence ◽  
Core Shell Structure

Pulsed-laser-activated impulse response encoder (PLAIRE): detection of core–shell structure of biomimetic micro gel-sphere

2018 ◽  
Vol 124 (9) ◽  
Author(s):  
Ryohei Yasukuni ◽  
Daiki Minamino ◽  
Tei Watanabe ◽  
Sohei Yamada ◽  
Takanori Iino ◽  
...  
Keyword(s):  
Impulse Response ◽  
Shell Structure ◽  
Pulsed Laser ◽  
Core Shell ◽  
Core Shell Structure

Liquid–liquid phase equilibrium and core–shell structure formation in immiscible Al–Bi–Sn alloys

2016 ◽  
Vol 122 (4) ◽  
Author(s):  
Mingyang Li ◽  
Peng Jia ◽  
Xiaofei Sun ◽  
Haoran Geng ◽  
Min Zuo ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Liquid Phase ◽  
Structure Formation ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

Nanocomposite particles for the preparation of advanced nanomaterials

1997 ◽  
Vol 501 ◽  
Author(s):  
P. Somasundaran ◽  
T. Chen
Keyword(s):  
Shell Structure ◽  
Advanced Technology ◽  
Core Shell ◽  
Nanocomposite Particles ◽  
The Core ◽  
Micron Size ◽  
Core Shell Structure ◽  
Shell Particles ◽  
Nano Size ◽  
Core Particles

ABSTRACTNew composites based on nano-size particles provide a promising route to the fabrication of novel materials for advanced technology applications. To produce desired materials, it is important to control the composition and distribution of nanoclusters within the bulk or surface coating of nanostructured materials. Towards this purpose, we have developed a novel method of processing nanocomposite materials utilizing colloidal chemistry techniques to tailor their microstructure. Unique composite aggregates of nanoparticles with a core-shell structure were prepared using a special scheme ofcontrolledpolymer adsorption. Polymers which specifically adsorb on both nano- and micron- size particles are used as tethers to enable desired coating of the later particles with the former and to enhance the cluster integrity. Nanocomposite particles consisting of micron-size alumina or silicon nitride as cores and nano-size alumina, titania, or iron oxide as shell particles have been successfully prepared using this process. The surface charge of the core particles is reversed after the adsorption of polyacrylic acid polymers. This promotes the interaction between the core and the shell particles and therefore nanoparticles added subsequently to the core particle suspension coat on core particles by electrostatic as well as possibly hydrogen bonding bridging mechanisms. Success of the process depends to a large extent on the absence of homoflocculation of nanoparticles and this is achieved by removing all the unadsorbed free polymers from the bulk solution before introducing them to coat on the polymer coated core particles. Coating itself is estimated by monitoring change in the zeta potential of core-shell structure. The coating scheme as well as the characterization of these nanocomposite particles are discussed in detail. This processing scheme provides a simple way for the preparation of both bulk and surface coatings with these engineered nanostructured particles as building blocks.

scholarly journals Transient Liquid Phase Behavior of Sn-Coated Cu Particles and Chip Bonding using Paste Containing the Particles

2017 ◽  
Vol 62 (2) ◽  
pp. 1143-1148 ◽  
Author(s):  
Jun Ho Hwang ◽  
Jong-Hyun Lee
Keyword(s):  
Liquid Phase ◽  
Phase Behavior ◽  
Shell Structure ◽  
Network Formation ◽  
Transient Liquid Phase ◽  
Core Shell ◽  
Bonding Pressure ◽  
Tlp Bonding ◽  
Core Shell Structure ◽  
Die Bonding

AbstractSn-coated Cu particles were prepared as a filler material for transient liquid phase (TLP) bonding. The thickness of Sn coating was controlled by controlling the number of plating cycles. The Sn-coated Cu particles best suited for TLP bonding were fabricated by Sn plating thrice, and the particles showed a pronounced endothermic peak at 232°C. The heating of the particles for just 10 s at 250°C destroyed the initial core-shell structure and encouraged the formation of Cu-Sn intermetallic compounds. Further, die bonding was also successfully performed at 250°C under a slight bonding pressure of around 0.1 MPa using a paste containing the particles. The bonding time of 30 s facilitated the bonding of Sn-coated Cu particles to the Au surface and also increased the probability of network formation between particles.

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