Digitale Medien
Springer
Journal of inorganic and organometallic polymers and materials
10 (2000), S. 145-156
ISSN:
1572-8870
Schlagwort(e):
shape control
;
Pt nanoparticle
;
linear polymer
;
reduction rate
;
tetrahedron
;
truncated octahedron
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract A preparative method to control the shape of platinum (Pt) nanoparticles in the presence of sodium polyacrylate (PAA) or poly(N-vinyl-2-pyrrolidone) (PVP) is described. Regardless of the kind of protective polymer used, the dominant shape of Pt nanoparticles was controlled by changing the reduction rate of Pt4+ ions. Tetrahedral particles predominated by using H2 reduction of H2[PtCl6]. Methanol reduction generated mainly truncated octahedral particles. It seems that the slow H2 reduction of Pt4+ ions favorably leads to the formation of tetrahedral Pt nuclei enclosed with four {111} planes that have the lowest surface energy. The truncated octahedral nuclei are formed by the faster reduction with methanol. The selective growth of the {111} planes takes place at a lower polymer concentration and results in the generation of cubic nanoparticles.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1009476128466
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