Synthesis and characterization of Ni–Au bimetallic nanoparticles

Autor:	A. Azizan, Koay Mei Hyie, Abdul Hakim Abdullah, N.R. Nik Roselina, Mardziah Che Murad
Rok vydání:	2015
Předmět:	Materials science Reducing agent Nanoparticle Statistical and Nonlinear Physics Nanotechnology Coercivity Condensed Matter Physics chemistry.chemical_compound Magnetization chemistry Chemical engineering Ferromagnetism Transmission electron microscopy Sodium citrate Bimetallic strip
Zdroj:	International Journal of Modern Physics B. 29:1540006
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s0217979215400068
Popis:	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.
Databáze:	OpenAIRE
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