Synthesis and Characterization of Sn/Ag Nanoparticle Composite as Electro-Catalyst for Fuel Cell

Tan Wei Kang; Siti Husnaa Mohd Taib; Pooria Moozarm Nia; Mikio Miyake; Kamyar Shameli

doi:10.37934/jrnn.1.1.1221

Lead Free Paste with under 3um Solder Particles for Fine Pitch C4 bumping and pre-coating solder applications

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/2013dpc-tp25 ◽

2013 ◽

Vol 2013 (DPC) ◽

pp. 000862-000889

Author(s):

Hironori Uno ◽

Masayuki Ishikawa ◽

Akihiro Masuda ◽

Hiroki Muraoka ◽

Kanji Kuba

Keyword(s):

Chemical Reduction ◽

Average Particle Size ◽

Average Particle ◽

Solder Paste ◽

Chemical Reduction Method ◽

Property Evaluation ◽

Fine Pitch ◽

Solder Bumps ◽

Size Of Particles ◽

Average Size

The work to be detailed in this paper is our development of 96.5mass%Sn-3.0mass%Ag-0.5mass%Cu fine solder particles with an average particle size of under 3um (D50), using a chemical reduction method. An evaluation was conducted on the properties of the particles. The average size of particles appeared to be under 3um with a higher yield compared to particles using the conventional gas atomization method. The melting temperature of fine solder particles using this method was its eutectic temperature, which is same as using the gas–atomized particles. 120um pitch solder bumps from the solder paste using the above mentioned fine solder particles were created on the substrate. As a result of property evaluation, it was turned out that the solder paste created a superior printing shape and coplanarity compared to the conventional paste with gas-atomized particles. In order to investigate the superior printing property generated by the paste with fine solder particles, the rheology of the paste was evaluated.It was verified that the anisotropic shape of particles has contributed to prevent the printed paste from slumping, which has resulted in the improvement of printed shape. It also shows that the filling characteristic of the paste was improved by the smaller particles and the better coplanarity was observed. The importance of finer solder particles for finer pitch assembly will be presented.

Download Full-text

Synthesis and Consolidation of Nano-Sized NiCo Powder by Powder Technology Rout

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.1425 ◽

2007 ◽

Vol 561-565 ◽

pp. 1425-1428 ◽

Cited By ~ 2

Author(s):

W.M. Daoush

Keyword(s):

Composite Powder ◽

Chemical Reduction ◽

Average Particle Size ◽

Complexing Agent ◽

Average Particle ◽

Chemical Reduction Method ◽

Homogeneous Microstructure ◽

Electrical And Magnetic Properties ◽

Saturation Induction ◽

Metallic Salt

Nano sized Co-20wt%Ni composite powder was synthesized by electroless chemical reduction method using metallic salt precursors and hypophosphite as a reducing agent in alkaline tartarate bath as a complexing agent. The synthesized powder provide better sinterability, mechanical, electrical and magnetic properties with homogeneous microstructure. The nano-sized powder could be obtained, which have the average particle size of 40 nm, with a saturation magnetization (Bs ) of 97.95 which was increased by heat treatments of powder in hydrogen to 127 emu/g due to the exclusion of the precipitated phosphrous in the composite powder. The powder underwent cold compaction at 600 Mpa and sintering at 1050 oC for 30 min. The saturation induction for the sintered material of 149.3 emu/g higher than the synthesized powder and has electrical resistivity value of 7.6 μcm.

Download Full-text

Electrical Properties of Silver Paste Prepared from Nanoparticles and Lead-Free Frit

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2007.059 ◽

2007 ◽

Vol 7 (11) ◽

pp. 3917-3919 ◽

Cited By ~ 9

Author(s):

Sung Hyun Park ◽

Dong Seok Seo ◽

Jong Kook Lee

Keyword(s):

Silver Nanoparticles ◽

Electrical Properties ◽

Screen Printing ◽

Chemical Reduction ◽

Silver Powder ◽

Average Particle Size ◽

Average Particle ◽

Chemical Reduction Method ◽

Silver Paste ◽

Thermal And Electrical Properties

Recently, PbO containing glass systems in commercial silver paste have been used due to their low glass transition temperature, good thermal and electrical properties. However, PbO is a hazardous material to both health and the environment. In this study, Pb-free silver paste was prepared by mixing commercial silver powder and silver nanoparticles. The commercial powder has an average particle size of 1.6 μm. The silver nanoparticles with particles size of 20–50 nm were synthesized by a chemical reduction method using surfactant. Pb-free frit was added into the mixed silver powder as the amounts of 3, 6 and 9 wt%. Using the obtained paste, thick films were fabricated by a screen printing on alumina substrate and the films were fired at temperature from 400 to 550 °C. The films had thickness of 6–11 μm and sheet resistivity of about 4–11 μΩ cm.

Download Full-text

Solar Energy as Renewable Energy for the Degradation of Pollutants using High Active Ag@TiO2/α-Fe2O3 Ternary Nanocomposite Photocatalyst

10.21203/rs.3.rs-1099297/v1 ◽

2021 ◽

Author(s):

Nesrine Ben Saber

Keyword(s):

Reduction Method ◽

Chemical Reduction ◽

Average Particle Size ◽

Visible Region ◽

Metallic Silver ◽

Average Particle ◽

Chemical Reduction Method ◽

Ternary Nanocomposite ◽

Photo Response ◽

Chemical Procedure

Abstract In this work, ternary Ag@TiO2/α-Fe2O3 nanocomposite were synthesized via solvothermal chemical reduction method using N,N-dimethylformamide (DMF) as solvent and reducing agent. The chemical procedure involves the use of only metals precursors without the need to use any other surfactants or capping agents. Physicochemical properties of the designed photocatalyst are found by means of various modern techniques. XRD data confirmed the high crystallinity of the obtained ternary nanocomposite. On the other hand, using TEM and HRTEM instruments, the shape and morphology of the Ag@TiO2/α-Fe2O3 nanocomposite were found to be spherical with an average particle size of 150 nm. The UV-Vis measurement shows that Ag@TiO2/α-Fe2O3 as photocatalyst exhibited good photo response in the visible region. The effect of preparation method and the performance of the designed photocatalyst were evaluated by photodegradation measurements of MB under visible light irradiation. We observed that the combination of metallic silver nanoparticles (AgNPs) and hematite iron oxide (α-Fe2O3) with titanium dioxide (TiO2) enhance the photocatalytic activity of the ternary Ag@TiO2/α-Fe2O3 photocatalyst compared to bare TiO2 suggesting its potential for many purification applications.

Download Full-text

Preparation and Characterization of Core-Shell γ-Fe2O3/Au Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.299-300.722 ◽

2011 ◽

Vol 299-300 ◽

pp. 722-726

Author(s):

Wen Chang Zhuang ◽

Yu Xiao Wang

Keyword(s):

Chemical Reduction ◽

Average Particle Size ◽

Visible Spectrum ◽

Core Shell ◽

Average Particle ◽

X Ray Diffraction ◽

X Ray ◽

X Ray Scattering ◽

Uv Visible

Composites have achieved much attention because of their excellent qualities. Core-shell γ-Fe2O3/Au nanoparticles were prepared by chemical reduction. Their optical properties and morphology were characterized by UV-visible spectrum (UV-vis), X-ray diffraction (XRD) and Transmission Electronic Microscopy (TEM). Furthermore, the average particle size and interface structure were also analyzed using small angle X-ray scattering (SAXS).

Download Full-text

Simple One-Step Synthesis of Uniform Disperse Copper Nanoparticles

MRS Proceedings ◽

10.1557/proc-879-z6.3 ◽

2005 ◽

Vol 879 ◽

Cited By ~ 4

Author(s):

Chunwei Wu ◽

Brian P. Mosher ◽

Taofang Zeng

Keyword(s):

Ascorbic Acid ◽

Copper Nanoparticles ◽

Chemical Reduction ◽

Average Particle Size ◽

Average Particle ◽

Face Centered Cubic ◽

Chemical Reduction Method ◽

Disperse Copper ◽

One Step ◽

Face Centered

AbstractIn this paper, we describe a simple and rapid solution-phase chemical reduction method with no inert gas protection, for preparing stable copper nanoparticle colloid with average particle size of 3.4 nm and narrow size distribution. In our synthesis route, ascorbic acid, natural vitamin C (VC), serves as both a reducing agent and an antioxidant to reduce copper salt precursor and effectively prevent the general oxidation process occurring to the newborn nanoparticles. XRD and UV/vis confirm the formation of pure face-centered cubic (fcc) copper nanoparticles and the excellent antioxidant ability of ascorbic acid.

Download Full-text

Preparation and Characterization of Ag@TiO2/α-Fe2O3 Ternary Nanocomposite for enhanced visible light photocatalytic performance

10.21203/rs.3.rs-814762/v1 ◽

2021 ◽

Author(s):

Nesrine Ben Saber ◽

Amine Mezni

Keyword(s):

Visible Light ◽

Chemical Reduction ◽

Average Particle Size ◽

Visible Region ◽

Metallic Silver ◽

Average Particle ◽

Ternary Nanocomposite ◽

Photo Response ◽

Chemical Procedure

Abstract In this work, ternary Ag@TiO2/α-Fe2O3 nanocomposite were synthesized via solvothermal chemical reduction method using N,N-dimethylformamide (DMF) as solvent and reducing agent. The chemical procedure involves the use of only metals precursors without the need to use any other surfactants or capping agents. Physicochemical properties of the designed photocatalyst are found by means of various modern techniques. XRD data confirmed the high crystallinity of the obtained ternary nanocomposite. On the other hand, using TEM and HRTEM instruments, the shape and morphology of the Ag@TiO2/α-Fe2O3 nanocomposite were found to be spherical with an average particle size of 150 nm. The UV-Vis measurement shows that Ag@TiO2/α-Fe2O3 as photocatalyst exhibited good photo response in the visible region. The effect of preparation method and the performance of the designed photocatalyst were evaluated by photodegradation measurements of MB under visible light irradiation. We observed that the combination of metallic silver nanoparticles (AgNPs) and hematite iron oxide (α-Fe2O3) with titanium dioxide (TiO2) enhance the photocatalytic activity of the ternary Ag@TiO2/α-Fe2O3 photocatalyst compared to bare TiO2 suggesting its potential for many purification applications.

Download Full-text

Synthesis and Characterization of Water-Soluble Monolayer-Protected Gold Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.415-417.617 ◽

2011 ◽

Vol 415-417 ◽

pp. 617-620 ◽

Cited By ~ 1

Author(s):

Yan Su ◽

Ying Yun Lin ◽

Yu Li Fu ◽

Fan Qian ◽

Xiu Pei Yang ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Particle Size ◽

Gold Nanoparticles ◽

Average Particle Size ◽

Water Soluble ◽

Synthesis And Characterization ◽

Average Particle ◽

Transmission Electron

Water-soluble gold nanoparticles (AuNPs) were prepared using 2-mercapto-4-methyl-5- thiazoleacetic acid (MMTA) as a stabilizing agent and sodium borohydride (NaBH4) as a reducing agent. The AuNPs product was analyzed by transmission electron microscopy (TEM), UV-vis absorption spectroscopy and Fourier transform infrared spectroscopy (FTIR). The TEM image shows that the particles were well-dispersed and their average particle size is about 5 nm. The UV-vis absorption and FTIR spectra confirm that the MMTA-AuNPs was stabilized by the carboxylate ions present on the surface of the AuNPs.

Download Full-text

Preparation and characterization of domperidone nanoparticles for dissolution improvement

Iraqi Journal of Pharmaceutical Sciences ( P-ISSN 1683 - 3597 E-ISSN 2521 - 3512) ◽

10.31351/vol27iss1pp39-52 ◽

2018 ◽

Vol 27 (1) ◽

pp. 39-52

Author(s):

Mohammed Sabar Al-lami ◽

Malath H. Oudah ◽

Firas A. Rahi

Keyword(s):

Particle Size ◽

Average Particle Size ◽

In Vitro Release ◽

Methyl Cellulose ◽

Precipitation Method ◽

Average Particle ◽

Antisolvent Precipitation ◽

Stirring Time

This study was carried out to prepare and characterize domperidone nanoparticles to enhance solubility and the release rate. Domperidone is practically insoluble in water and has low and an erratic bioavailability range from 13%-17%. The domperidone nanoparticles were prepared by solvent/antisolvent precipitation method at different polymer:drug ratios of 1:1 and 2:1 using different polymers and grades of poly vinyl pyrolidone, hydroxy propyl methyl cellulose and sodium carboxymethyl cellulose as stabilizers. The effect of polymer type, ratio of polymer:drug, solvent:antisolvent ratio, stirring rate and stirring time on the particle size, were investigated and found to have a significant (p? 0.05) effect on particle size. The best formula was obtained with lowest average particle size of 84.05. This formula was studied for compatibility by FTIR and DSC, surface morphology by FESEM and crystalline state by XRPD. Then domperidone nanoparticles were formulated into a simple capsule dosage form in order to study of the in vitro release of drug from nanoparticles in comparison raw drug and mixture of polymer:drug ratios of 2:1. The release of domperidone from best formula was highly improved with a significant (p? 0.05) increase.

Download Full-text