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Nickel nanoparticles obtained by a modified polyol process: synthesis, characterization, and magnetic properties
Giselle G Couto1, João J Klein, Wido H Schreiner
1Departamento de Química, Universidade Federal do Paraná (UFPR), CP 19081, CEP 81531-990 Curitiba-PR, Brazil.
Journal of Colloid and Interface Science
|April 17, 2007
Summary
Researchers synthesized nickel nanoparticles using poly(N-vinilpyrrolidone) (PVP) as a protective agent. The resulting face-centered cubic nickel nanoparticles exhibited superparamagnetism, indicating potential applications in magnetic materials.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Poly(N-vinilpyrrolidone) (PVP) is a versatile polymer used for stabilizing nanoparticles.
- Nickel nanoparticles (NiNPs) possess unique magnetic and catalytic properties.
- Controlled synthesis of NiNPs is crucial for their application.
Purpose of the Study:
- To synthesize nickel nanoparticles using PVP as a protective agent.
- To characterize the structural, chemical, and magnetic properties of the synthesized NiNPs.
- To investigate the influence of the nickel/PVP ratio on NiNP characteristics.
Main Methods:
- Modified polyol route synthesis using nickel chloride and sodium borohydride.
- X-ray diffraction (XRD) for crystal structure analysis.
- Transmission electron microscopy (TEM) for size and morphology.
- Fourier transformed infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) for surface chemistry.
- Magnetic measurements for magnetic properties.
Main Results:
- Face-centered cubic metallic nickel nanoparticles with a mean diameter of 3.8 nm were synthesized.
- Good size dispersion and effective interaction between NiNP surface and PVP carboxyl oxygen atoms were observed.
- Magnetic measurements indicated single-domain nonideal superparamagnetism due to dipolar magnetic coupling.
Conclusions:
- The polyol route effectively synthesizes PVP-protected nickel nanoparticles.
- The synthesized NiNPs exhibit desirable structural and magnetic properties for potential applications.
- The nickel/PVP ratio influences the characteristics of the resulting nanoparticles.
