Abstract
Fivefold symmetry appears only in small particles and quasicrystals because internal stress in the particles increases with the particle size. However, a typical Marks decahedron with five re-entrant grooves located at the ends of the twin boundaries can further reduce the strain energy. During hydrothermal synthesis, it is difficult to stir the reaction solution contained in a digestion high-pressure tank because of the relatively small size and high-temperature and high-pressure sealed environment. In this work, we optimized a hydrothermal reaction system by replacing the conventional drying oven with a homogeneous reactor to shift the original static reaction solution into a full mixing state. Large Marks-decahedral Pd nanoparticles (~90 nm) have been successfully synthesized in the optimized hydrothermal synthesis system. Additionally, in the products, round Marks-decahedral Pd particles were also found for the first time. While it remains a challenge to understand the growth mechanism of the fivefold twinned structure, we proposed a plausible growth-mediated mechanism for Marks-decahedral Pd nanoparticles based on observations of the synthesis process.
This is a stepwise growth mechanism for Marks-decahedral Pd nanoparticles. First, many truncated tetrahedrons are formed. Then, two adjacent {111} facets of a truncated single tetrahedron simultaneously grow epitaxially, forming a truncated tri-tetrahedron. A Marks decahedron is formed directly by epitaxial growth of both concave {111} facets of a truncated tri-tetrahedron.
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This study was funded by the National Nature Science Foundation of China (grant number 21373273).
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Zhao, H., Qi, W., Ji, W. et al. Large Marks-decahedral Pd nanoparticles synthesized by a modified hydrothermal method using a homogeneous reactor. J Nanopart Res 19, 162 (2017). https://doi.org/10.1007/s11051-017-3856-0
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DOI: https://doi.org/10.1007/s11051-017-3856-0