Formation of Hexagonal-Close Packed (HCP) Rhodium as a Size Effect

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• 作者：Jing Lu Huang ; Zhi Li ; Hao Hong Duan ; Zhi Ying Cheng ; Ya Dong Li ; Jing Zhu ; Rong Yu
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：139
• 期：2
• 页码：575-578
• 全文大小：352K
• ISSN：1520-5126

文摘

Previous studies on the structural and functional properties of rhodium are based on the face-centered-cubic (fcc) structure in the bulk form. Here we report the first discovery of the hexagonal-close packed (hcp) rhodium in the nanoparticle form. The hcp Rh can be directly synthesized by solvothermal reaction or by electron-beam induced decomposition of Rh monolayers. The hcp Rh nanoparticles are stable under electron beam irradiation. Compared with the fcc structure, the hcp Rh nanoparticles show a large lattice expansion (6% larger atomic volume). The first-principles calculations suggest that the lower surface energy of hcp Rh leads to the size effect in the crystal structure.