Synthesis and characterization of Ni–Au bimetallic nanoparticles

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540006 ◽  
Author(s):  
N. R. Nik Roselina ◽  
A. Azizan ◽  
Koay Mei Hyie ◽  
Mardziah Che Murad ◽  
Abdul Hakim Abdullah
Keyword(s):  
Shell Structure ◽  
Sodium Citrate ◽  
Bimetallic Nanoparticles ◽  
Reducing Agent ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Transmission Electron ◽  
Structure Of Nanoparticles ◽  
Core Shell Structure

Bimetallic structure of nanoparticles is of great interest due to their extraordinary properties, especially in combining the specialty of the core and its shell. This work reports the effect of pH on the synthesis of Ni – Au (nickel–gold) bimetallic nanoparticles. The synthesis involves a two-step process where Ni nanoparticles were first synthesized using polyol method with hydrazine as the reducing agent. This was followed by the process of reducing [Formula: see text] to Au in the solution containing pre-prepared Ni to form Ni – Au bimetallic nanoparticles using sodium citrate as the reducing agent. The results obtained from Transmission Electron Microscopy (TEM) show that the process can possibly produce either core-shell structure, or mixture of Ni and Au nanoparticles. Magnetic property of core-shell structure investigated using Vibrating Sample Magnetometer (VSM) demonstrated typical characteristic of ferromagnetic with an increased magnetization as compared to Ni nanoparticles. The saturation magnetization (Ms) and coercivity (Hc) were obtained as 19.1 emu/g and 222.3 Oe, respectively.

Investigation of Redox-Transmetallation Process for Coating of Gold(Au)-Shell on Nickel(Ni)-Core Nanoparticles

2014 ◽  
Vol 607 ◽  
pp. 55-60
Author(s):  
N.R. Nik Roselina ◽  
Azizan Aziz ◽  
Koay Mei Hyie ◽  
Che Murad Mardziah ◽  
Zuraida Salleh
Keyword(s):  
Shell Structure ◽  
Sodium Citrate ◽  
Size Range ◽  
Reducing Agent ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Spectra Analysis ◽  
The Core ◽  
Core Shell Structure ◽  
Core Nanoparticles

Core-shell nanoparticle has created great interest among researchers due to their various unique properties. The new properties created are combination of both the core and the shell. In this work, pre-prepared Nickel (Ni) nanoparticles were coated with Gold (Au) to produce core-shell structure. Formation mechanism of the core-shell structure is investigated via UV-Vis spectrum of the as-synthesized particles and its supernatants. Ni nanoparticles were synthesized using polyol method with hydrazine as the reducing agent. Coating of Au was conducted using sodium citrate as the reducing agent and acid citric to control the pH of the mixture. UV-Vis absorption spectra analysis of as-synthesized nanoparticles and the supernatant results revealed that the coating happened via redox-transmetallation process with a very broad peak at about 540 nm and size range of 26 - 40 nm. XPS results suggest that the coating consists of Au compound.

Preparation and Characterization of Chain-Like and Peanut-Like Fe3O4@SiO2 Core–Shell Structure

2013 ◽  
Vol 13 (10) ◽  
pp. 6953-6960 ◽  
Author(s):  
Haowei Shi ◽  
Yan Huang ◽  
Chao Cheng ◽  
Guoyuan Ji ◽  
Yuxiang Yang ◽  
...  
Keyword(s):  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

Synthesis and characterization of upconversion nanoparticles with shell structure and ligand-free hydrophilic modification

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 83149-83154 ◽  
Author(s):  
Di Kang ◽  
Xiaoyan Song ◽  
Jinfeng Xing
Keyword(s):  
Rare Earth ◽  
Shell Structure ◽  
Synthesis And Characterization ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Hydrophilic Modification ◽  
Ligand Free ◽  
Core Shell Structure

Rare-earth upconversion nanoparticles (UCNPs) with α and β phases were prepared. UCNPs with core–shell structure were prepared and modified to be hydrophilic by ligand-free hydrophilic modification.

scholarly journals Characterization of Metallic Core-Shell Structure of Electro-Catalysts

2010 ◽  
Vol 16 (S2) ◽  
pp. 1804-1805
Author(s):  
D Su ◽  
L Wu ◽  
H Inada ◽  
JX Wang ◽  
W Zhou ◽  
...  
Keyword(s):  
Shell Structure ◽  
Core Shell ◽  
Metallic Core ◽  
Core Shell Structure

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

scholarly journals Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

2019 ◽  
Vol 8 (1) ◽  
pp. 133-147 ◽  
Author(s):  
Suzana Filipović ◽  
Vera P. Pavlović ◽  
Miodrag Mitrić ◽  
Steva Lević ◽  
Nebojša Mitrović ◽  
...  
Keyword(s):  
Shell Structure ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Core Shell Structure

scholarly journals Facile Preparation and Characterization of Carbon Fibers with Core-Shell Structure from Graphene-Dispersed Isotropic Pitch Compounds

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 521
Author(s):  
Dong Lee ◽  
Yong-Hwan Choi ◽  
Kyong Rhee ◽  
Kap Yang ◽  
Byung-Joo Kim
Keyword(s):  
Carbon Fibers ◽  
Shell Structure ◽  
Thermal Characteristics ◽  
Surface Region ◽  
Petroleum Residue ◽  
Core Shell ◽  
Isotropic Pitch ◽  
Core Shell Structure ◽  
Tga Analysis

In this study, isotropic pitch-based carbon fibers were prepared from a mixture of petroleum residue and graphene nanoplatelets with different contents. The softening point and synthetic yield of synthesized isotropic pitches were analyzed and compared to characterize the nature of the pitches. The surface and thermal characteristics of the fibers were observed using scanning electron microscopy and thermogravimetric analysis (TGA), respectively. From the results, it was observed that the prepared carbon fibers had an interesting core-shell structure. In the TGA analysis with air, the carbon fiber having 0.1 wt.% of graphene showed a higher residue yield than that of the sample having 1.0 wt.% of graphene. This result can be explained due to the graphene being placed on the surface region of the carbon fibers and directly helping to increase the surface area of the carbon fibers, resulting in rapid oxidation due to the enhanced contact area with oxygen.

scholarly journals Recent progress in characterization of the core–shell structure of black titania

2019 ◽  
Vol 34 (07) ◽  
pp. 1138-1153 ◽  
Author(s):  
Mengkun Tian ◽  
Chenze Liu ◽  
Jingxuan Ge ◽  
David Geohegan ◽  
Gerd Duscher ◽  
...  
Keyword(s):  
Shell Structure ◽  
Recent Progress ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure ◽  
Image Position

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