Selective formation of tetrahedral Pt nanocrystals from K2PtCl6/PVP |
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作者姓名: | YUYingtao XUBoqing |
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作者单位: | DepartmentofChemistry,TsinghuaUniversity,Beijing100084,China |
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基金项目: | 科技部资助项目,国家自然科学基金,清华大学校科研和教改项目 |
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摘 要: | Tetrahedral platinum (Pt) nanocrystals (3-8 nm) are synthesized in high selectivity (ca. 80%) from hydrogen reduction of aqueous K2PtCI6 by using polyvinylpyr-rolidone (PVP: Mw≈360000) as a protector. Morphology (TEM) measurements of the metal colloids and UV-Vis absorption of the colloidal solution are employed to monitor the tetrahedron formation during the syntheses with varying K2PtCl6/PVP ratios. The results clearly show a two-stage process for the selective formation of tetrahedral nanocrystals. Rapid nucleation and crystal formation at the early stage result in round-like crystallites and the external facet evolution in thereafter slow crystal growth leads selectively to the formation of the tetrahedrons.
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关 键 词: | 纳米晶体 铂 Pt 四面体结构 纳米技术 |
收稿时间: | 23 April 2008 |
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