Performance Comparison of High Temperature Pt-Based Sensor Using Pt Core-Shell Powder and Paste

2016 ◽  
Vol 2016 (1) ◽  
pp. 000700-000704
Author(s):  
Richard Stephenson ◽  
Kyle Bandaccari ◽  
Howard Imhof
Keyword(s):  
Oxygen Sensor ◽  
Chemical Precipitation ◽  
Performance Comparison ◽  
Core Shell ◽  
Powder Materials ◽  
Ceramic Core ◽  
Conductive Materials ◽  
Powder Characteristics ◽  
Overall Performance ◽  
Shell Powder

Abstract Platinum core-shell powder materials are compared and discussed in an oxygen sensor application. The conductive layer materials are prepared by chemical precipitation in the absence or presence of substrate powders, such as YSZ or alumina, to produce platinum powders or platinum/ceramic core/shell composites, respectively. Physical and bulk powder characteristics are presented and discussed. An oxygen sensor is constructed and overall performance is presented to compare the different conductive materials using HTCC tapes and pre-fired substrates.

Novel Core-Shell Conductive Materials for LTCC Metallizations

2016 ◽  
Vol 2016 (1) ◽  
pp. 000721-000725
Author(s):  
Richard Stephenson ◽  
Kyle Bandaccari ◽  
Howard Imhof
Keyword(s):  
Chemical Precipitation ◽  
Process Conditions ◽  
Core Shell ◽  
Powder Materials ◽  
Reliability Data ◽  
Conductive Materials ◽  
The Core ◽  
Shell Powder ◽  
Core Materials

Abstract Silver and copper core-shell powder materials are introduced and discussed for application in LTCC. Properties of the core-shell powders are reviewed and suggested process conditions are shown. The conductive core-shell materials are fabricated using chemical precipitation technology in the presence of core materials comprised of LTCC tape body powder. Result of application of the conductive core-shell materials are presented on various commercial tapes along with corresponding reliability data.

scholarly journals Electrochemical Processing and Thermal Properties of Functional Core/Multi-Shell ZnAl/Ni/NiP Microparticles

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 834
Author(s):  
David Svetlizky ◽  
Honorata Kazimierczak ◽  
Bar Ovadia ◽  
Ariel Sharoni ◽  
Noam Eliaz
Keyword(s):  
Electroless Deposition ◽  
Core Shell ◽  
Powder Materials ◽  
Functional Coatings ◽  
Surface Layers ◽  
Standard Potential ◽  
Scanning Calorimetry ◽  
Step Process ◽  
Shell Powder ◽  
Deposition Conditions

Electroless deposition on zinc and its alloys is challenging because of the negative standard potential of zinc, the formation of poor surface layers during oxidation in aqueous solutions, and extensive hydrogen evolution. Therefore, there are only few reports of electroless deposition on Zn and its alloys, neither of them on micro/nano powders. Here, we propose a two-step process that allows the formation of compact, uniform, and conformal Ni/NiP shell on Zn-based alloy microparticles without agglomeration. The process utilizes controlled galvanic displacement of Ni deposition in ethanol-based bath, followed by NiP autocatalytic deposition in an alkaline aqueous solution. The mechanism and effect of deposition conditions on the shell formation are discussed. Thermal stability and functional analysis of core-shell powder reveal a thermal storage capability of 98.5% with an encapsulation ratio of 66.5%. No significant morphological change of the core-shell powder and no apparent leakage of the ZnAl alloy through the Ni shell are evident following differential scanning calorimetry tests. Our two-step process paves the way to utilize electroless deposition for depositing metallic-based functional coatings on Zn-based bulk and powder materials.

New Low Temperature Alloy Core-Shell Structures for Joining Applications

2016 ◽  
Vol 2016 (1) ◽  
pp. 000705-000710
Author(s):  
Richard Stephenson ◽  
Kyle Bandaccari ◽  
Howard Imhof
Keyword(s):  
Low Temperature ◽  
Lead Free ◽  
Shell Structures ◽  
Process Conditions ◽  
Core Shell ◽  
Powder Materials ◽  
Application Process ◽  
The Core ◽  
Fracture Area ◽  
Shell Powder

Abstract Silver and copper core-shell powder materials are introduced and discussed in low temperature joining applications. Properties of the core-shell powders are reviewed and suggested process conditions are shown. Examination of ductile fracture area corroborate bonding strength results for both silver and copper core-shell materials. Selectable materials sets are presented to address different application process needs for lead-free systems.

scholarly journals One-step Synthesis of Magnetic Metal-ceramic Core-shell Nanoparticles by RF Thermal Plasma

2013 ◽  
Vol 50 (7) ◽  
pp. 495-501 ◽  
Author(s):  
Keitaro Nakamura ◽  
Akihiro Kinoshita ◽  
Shu Watanabe ◽  
Naohito Uemura ◽  
Kiyoshi Takahashi
Keyword(s):  
Thermal Plasma ◽  
Core Shell ◽  
Ceramic Core ◽  
Shell Nanoparticles ◽  
Magnetic Metal ◽  
Metal Ceramic ◽  
One Step ◽  
Rf Thermal Plasma ◽  
Core Shell Nanoparticles

Monodisperse Fe3O4/Fe Core/Shell Nanoparticles with Enhanced Magnetic Property

2011 ◽  
Vol 306-307 ◽  
pp. 410-415
Author(s):  
Li Sun ◽  
Fu Tian Liu ◽  
Qi Hui Jiang ◽  
Xiu Xiu Chen ◽  
Ping Yang
Keyword(s):  
Average Diameter ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Shell Nanoparticles ◽  
X Ray ◽  
Transmission Electron ◽  
Shell Particles ◽  
Core Shell Nanoparticles

Core/shell type nanoparticles with an average diameter of 20nm were synthesized by chemical precipitation method. Firstly, Monodisperse Fe3O4 nanoparticles were synthesized by solvethermal method. FeSO4ž7H2O and NaBH4 were respectively dissolved in distilled water, then moderated Fe3O4 particles and surfactant(PVP) were ultrasonic dispersed into the FeSO4ž7H2O solution. The resulting solution was stirred 2 h at room temperature. Fe could be deposited on the surface of monodispersed Fe3O4 nanoparticles to form core-shell particles. The particles were characterized by using various experimental techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), AGM and DTA. The results suggest that the saturation magnetization of the nanocomposites is 100 emu/g. The composition of the samples show monodisperse and the sides of the core/shell nanoparticles are 20-30nm. It is noted that the formation of Fe3O4/Fe nanocomposites magnetite nanoparticles possess superparamagnetic property.

Activation of B as a sintering aid and its improved microstructure modification by using Ni-B coated Ti core-shell powder

Materialia ◽  
2019 ◽  
Vol 5 ◽  
pp. 100182
Author(s):  
S.F. Li ◽  
Y.F. Yang ◽  
K. Kondoh ◽  
S. Kariya ◽  
Q.S. Zhu ◽  
...  
Keyword(s):  
Core Shell ◽  
Sintering Aid ◽  
Microstructure Modification ◽  
Shell Powder

Synthesis and Characterization of ZnS: Fe/ZnS Core-Shell Nanocrystals

2011 ◽  
Vol 148-149 ◽  
pp. 900-903
Author(s):  
Li Hua Li ◽  
Yong Jun Gu ◽  
Rui Shi Xie ◽  
Jian Guo Zhu
Keyword(s):  
Chemical Precipitation ◽  
Precipitation Method ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Pl Spectra ◽  
Zinc Blende ◽  
Diffraction Peaks ◽  
Zns Nanocrystals ◽  
Zinc Blende Structure

ZnS:Fe and ZnS:Fe/ZnS core-shell nanocrystals were synthesized by chemical precipitation method. It was found that the ZnS: Fe based nanocrystals possess zinc blende structure. Compared to ZnS: Fe nanocrystals, the intensity of the X-ray diffraction peaks of ZnS: Fe/ZnS nanocrystals reduced and these peaks moved to lower angles. TEM images show that ZnS: Fe based nanocrystals are spheroidal and the average particles size is about 3~4 nm. PL spectra of ZnS: Fe nanocrystals revealed several mission bands, ~406nm, ~444nm, ~416nm, However, PL spectra of ZnS: Fe/ZnS nanocrystals showed several mission bands, ~420nm, ~432nm, ~449nm.

The Development of Latent Fingermarks for Visualization by Using AuNPs@AuNCs Core/Shell Nanoparticles

NANO ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. 2050132
Author(s):  
Yan Jun Liu ◽  
Ling Yan Zhang
Keyword(s):  
Core Shell ◽  
Light Sources ◽  
Shell Nanoparticles ◽  
Uniform Size ◽  
In Situ Preparation ◽  
Latent Fingermark ◽  
Core Shell Nanoparticles ◽  
Shell Powder ◽  
Good Contrast

A method for in situ preparation of fluorescent AuNPs@AuNCs core/shell nanoparticles by the template of BSA coated gold nanoparticles was developed. The as-prepared AuNPs@AuNCs core/shell nanoparticles possessed advantages such as uniform size, improved monodispersity and excellent fluorescence. The AuNPs@AuNCs core/shell nanoparticles in powder and suspension form were applied to the detection of latent fingermark due to the above properties. The developed latent fingermarks by AuNPs@AuNCs core/shell powder on various surfaces can exhibit excellent ridge details with good contrast between the fingermarks and the substrate. Moreover, under alternative light sources, the latent fingermarks developed with AuNPs@AuNCs core/shell powder work well.

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