TY - JOUR
T1 - Synthesis and characterization of nickel nanoparticles by hydrazine reduction in ethylene glycol
AU - Wu, Szu Han
AU - Chen, Dong Hwang
N1 - Funding Information:
This work was performed under the auspices of the National Science Council of the Republic of China, under Contract NSC 90-2214-E006-009, to which the authors wish to express their thanks.
PY - 2003/3/15
Y1 - 2003/3/15
N2 - The synthesis of nickel nanoparticles by the hydrazine reduction of nickel chloride in ethylene glycol at 60°C without soluble polymer as a protective agent was studied. It was found that an appropriate amount of NaOH was necessary for the formation of pure nickel nanoparticles. Also, it was not necessary to perform the reaction under a nitrogen atmosphere. By the analyses of X-ray diffraction, high-resolution transmission electron microscopy, and electron diffraction pattern, the resultant particles were characterized to be pure crystalline nickel with a face-centered cubic (fcc) structure. By transmission electron microscopy, it was observed that the mean diameter decreased with increasing the ratio of [N2H5OH]/[NiCl2] and approached a constant when [N2H5OH]/[NiCl2]>12. In addition, the resultant nickel nanoparticles could be magnetically recovered and re-dispersed in ethylene glycol without size change and agglomeration. The magnetic measurements indicated they were superparamagnetic with a saturation magnetization of 22 emu/g, a remanent magnetization of 6.4 emu/g, and a coercivity of 0.1 Oe at a mean diameter of 9.2 nm. Also, the magnetization increased with decreasing temperature due to the decrease in thermal energy. All the observed magnetic properties essentially reflected the nanoparticle nature. Furthermore, it was found that hydrazine was catalytically decomposed to hydrogen and nitrogen gases by the resultant nickel nanoparticles. The corresponding decomposition rate at 25°C and 1 atm was 3.1 nmol/(h mg of Ni).
AB - The synthesis of nickel nanoparticles by the hydrazine reduction of nickel chloride in ethylene glycol at 60°C without soluble polymer as a protective agent was studied. It was found that an appropriate amount of NaOH was necessary for the formation of pure nickel nanoparticles. Also, it was not necessary to perform the reaction under a nitrogen atmosphere. By the analyses of X-ray diffraction, high-resolution transmission electron microscopy, and electron diffraction pattern, the resultant particles were characterized to be pure crystalline nickel with a face-centered cubic (fcc) structure. By transmission electron microscopy, it was observed that the mean diameter decreased with increasing the ratio of [N2H5OH]/[NiCl2] and approached a constant when [N2H5OH]/[NiCl2]>12. In addition, the resultant nickel nanoparticles could be magnetically recovered and re-dispersed in ethylene glycol without size change and agglomeration. The magnetic measurements indicated they were superparamagnetic with a saturation magnetization of 22 emu/g, a remanent magnetization of 6.4 emu/g, and a coercivity of 0.1 Oe at a mean diameter of 9.2 nm. Also, the magnetization increased with decreasing temperature due to the decrease in thermal energy. All the observed magnetic properties essentially reflected the nanoparticle nature. Furthermore, it was found that hydrazine was catalytically decomposed to hydrogen and nitrogen gases by the resultant nickel nanoparticles. The corresponding decomposition rate at 25°C and 1 atm was 3.1 nmol/(h mg of Ni).
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U2 - 10.1016/S0021-9797(02)00135-2
DO - 10.1016/S0021-9797(02)00135-2
M3 - Article
C2 - 16256507
AN - SCOPUS:0037444133
VL - 259
SP - 282
EP - 286
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 2
ER -