TY - JOUR
T1 - Toward to branched platinum nanoparticles by polyol reduction
T2 - A role of poly(vinylpyrrolidone) molecules
AU - Tsuji, Masaharu
AU - Jiang, Peng
AU - Hikino, Sachie
AU - Lim, Seongyop
AU - Yano, Ryuto
AU - Jang, Sang Min
AU - Yoon, Seong Ho
AU - Ishigami, Naoki
AU - Tang, Xinling
AU - Kamarudin, Khairul Sozana Nor
N1 - Funding Information:
We thank Prof. Hiroki Ago of our institute for the use of his SEM. This work was supported by JST-CREST, Joint Project of Chemical Synthesis Core Research Institutions, and Grant-in-Aid for Scientific Research on Priority Areas “unequilibrium electromagnetic heating” and Grant-in-Aid for Scientific Research (B) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (Nos. 19033003 and 19310064).
PY - 2008/3/20
Y1 - 2008/3/20
N2 - Branched Pt nanoparticles with nanometer sizes have been successfully synthesized by reduction of H2PtCl6·6H2O precursor in ethylene glycol (EG) in the presence of small amounts of NaNO3 and PVP. Morphologies of the Pt nanoparticles can be systematically evolved from regular octahedron, and triangular plate via tri-pod, penta-pod, and octa-pod to multi-pod needle-like shapes only by decreasing concentrations of H2PtCl6·6H2O and NaNO3 at a constant NaNO3/H2PtCl6·6H2O molar ratio and the same PVP concentration. To the best of knowledge, this is the first report for the synthesis of Pt penta-pod. High resolution transmission electron microscope (TEM) observation of the Pt nanoparticles demonstrates that the Pt branches actually extendedly grow out from certain angles of triangular plates, octahedrons, and decahedrons, respectively. Multi-branched needle-like Pt nanocrystals are believed probably to originate from further anisotropic growth of the Pt octa-pods or overlap of small branched Pt nanoparticles. PVP molecules have been found to play an important role in controlling morphologies of the branch-like Pt nanoparticles besides NaNO3. It probably is the cooperated kinetic adsorption and desorption of PVP molecules and various anions on particle surfaces that influence the growth of the Pt nanoparticles. A reasonable growth mechanism has been suggested to explain the evolution of the Pt branches, in which the difference among growth rates along various crystallographic directions of face-centered cubic Pt crystal probably determines final morphologies of the Pt nanocrystals.
AB - Branched Pt nanoparticles with nanometer sizes have been successfully synthesized by reduction of H2PtCl6·6H2O precursor in ethylene glycol (EG) in the presence of small amounts of NaNO3 and PVP. Morphologies of the Pt nanoparticles can be systematically evolved from regular octahedron, and triangular plate via tri-pod, penta-pod, and octa-pod to multi-pod needle-like shapes only by decreasing concentrations of H2PtCl6·6H2O and NaNO3 at a constant NaNO3/H2PtCl6·6H2O molar ratio and the same PVP concentration. To the best of knowledge, this is the first report for the synthesis of Pt penta-pod. High resolution transmission electron microscope (TEM) observation of the Pt nanoparticles demonstrates that the Pt branches actually extendedly grow out from certain angles of triangular plates, octahedrons, and decahedrons, respectively. Multi-branched needle-like Pt nanocrystals are believed probably to originate from further anisotropic growth of the Pt octa-pods or overlap of small branched Pt nanoparticles. PVP molecules have been found to play an important role in controlling morphologies of the branch-like Pt nanoparticles besides NaNO3. It probably is the cooperated kinetic adsorption and desorption of PVP molecules and various anions on particle surfaces that influence the growth of the Pt nanoparticles. A reasonable growth mechanism has been suggested to explain the evolution of the Pt branches, in which the difference among growth rates along various crystallographic directions of face-centered cubic Pt crystal probably determines final morphologies of the Pt nanocrystals.
UR - http://www.scopus.com/inward/record.url?scp=38949179823&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38949179823&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2007.09.030
DO - 10.1016/j.colsurfa.2007.09.030
M3 - Article
AN - SCOPUS:38949179823
SN - 0927-7757
VL - 317
SP - 23
EP - 31
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 1-3
ER -