Abstract
Growth of Cu polyhedral structures with well-defined and controllable shapes faced tremendous synthetic challenges in colloid nanocrystal synthesis in the past few decades. In this article, we report a facile approach for the synthesis of Cu nanocrystals with systematic morphological evolution. Transitional truncated octahedral, edge- and corner-truncated octahedral, all-corner-truncated octahedral, and octahedral structures were obtained in a solution-based reduction reaction by precise tuning reaction time. Four distinct morphologies of nanocrystals have been characterized by SEM technique. The optical properties of these various morphologies of nanocrystals were also investigated, and it indicates that the SPR band shifts red while the shape of nanoparticles evolves from transitional truncated octahedral to octahedral, whose resonant bands are transferred from 590 nm to 620 nm.
Highlights
Nanomaterials have aroused significant attention over the past decades due to their unique physical and chemical properties and technical applications
Most efforts have been devoted to the synthesis of nanoparticles which are bounded by lowindex {111} and {100} facets
Highresolution Transmission electron microscopy (TEM) (HRTEM) and selected area electron diffraction (SAED) images were obtained by a JEOL JEM 2100F electron microscope with an accelerating voltage of 200 kV
Summary
Nanomaterials have aroused significant attention over the past decades due to their unique physical and chemical properties and technical applications. Rational shape-controlled synthesis of metal nanoparticles is a crucial issue to understand their shape-dependent properties and growth mechanism. The synthesis of metal nanoparticles enclosed by high-energy facets is an important and difficult task because these high-energy facets can exhibit higher activity, improving their potential applications in catalysis. Xiong and Xia have synthesized various shapes of Pd nanocrystals by controlling the crystalline seeds and the growth rates of different. Tanori and Pileni had synthesized Cu nanocrystals with different shapes by mixing reverse micelles with excess reducing agents and tried to understand their growth mechanism [26]. Transitional truncated octahedron, edge- and corner-truncated octahedron, all-corner-truncated octahedron, and octahedron can be obtained with different reaction times These nanoparticles can be readily prepared without the use of any seeds or extra metal ions, but with oleylamine and trioctylphosphine as ligands only
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