TY - JOUR
T1 - Synthesis of platinum ultrafine particles in AOT reverse micelles
AU - Chen, Dong Hwang
AU - Yeh, Jiunn Jiun
AU - Huang, Ting Chia
N1 - Funding Information:
This work was performed under the auspices of the National Science Council of the Republic of China, under Contract NSC 87-2214-E006-010, to which the authors wish to express their thanks.
PY - 1999/7/1
Y1 - 1999/7/1
N2 - The synthesis of platinum ultrafine particles by the reduction of H2PtCl6 with hydrazine in AOT/isooctane reverse micellar solutions has been studied. By high-resolution electron microscope, electron diffraction pattern, and XRD analyses, the resultant particles have been found to be pure platinum of fcc structure. Their sizes were observed to increase with the increases in the molar ratio of water to AOT (ω(O)) and in the concentration of H2PtCl6, while they decreased with the increase of hydrazine concentration. At a constant ω(O) value, the size of platinum ultrafine particles was not affected significantly when the concentration ratio of hydrazine to H2PtCl6 was above 10, the AOT concentration increased from 0.1 to 0.6 M, and the temperature varied from 15 to 35 °C. Furthermore, the kinetic study of particle formation indicated that the nucleation time needed several minutes. The time for the growth of platinum ultrafine particles to their final size after nucleation was about one to several hours. It was observed that the formation rates increased with the increase of ω(O) value and the concentrations of AOT and H2PtCl6, but they were not affected by hydrazine concentration when the concentration ratio of hydrazine to H2PtCl6 was above 10.
AB - The synthesis of platinum ultrafine particles by the reduction of H2PtCl6 with hydrazine in AOT/isooctane reverse micellar solutions has been studied. By high-resolution electron microscope, electron diffraction pattern, and XRD analyses, the resultant particles have been found to be pure platinum of fcc structure. Their sizes were observed to increase with the increases in the molar ratio of water to AOT (ω(O)) and in the concentration of H2PtCl6, while they decreased with the increase of hydrazine concentration. At a constant ω(O) value, the size of platinum ultrafine particles was not affected significantly when the concentration ratio of hydrazine to H2PtCl6 was above 10, the AOT concentration increased from 0.1 to 0.6 M, and the temperature varied from 15 to 35 °C. Furthermore, the kinetic study of particle formation indicated that the nucleation time needed several minutes. The time for the growth of platinum ultrafine particles to their final size after nucleation was about one to several hours. It was observed that the formation rates increased with the increase of ω(O) value and the concentrations of AOT and H2PtCl6, but they were not affected by hydrazine concentration when the concentration ratio of hydrazine to H2PtCl6 was above 10.
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U2 - 10.1006/jcis.1999.6239
DO - 10.1006/jcis.1999.6239
M3 - Article
AN - SCOPUS:0033167309
SN - 0021-9797
VL - 215
SP - 159
EP - 166
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 1
ER -