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Synthesis of Metallic Nanocrystals: From Noble Metals to Base Metals

1
Zhumadian Academy of Industry Innovation and Development, Huanghuai University, Zhumadian 463000, China
2
State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
3
Department of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(9), 1497; https://doi.org/10.3390/ma12091497
Received: 4 April 2019 / Revised: 3 May 2019 / Accepted: 3 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Growth and Design of Inorganic Crystal)
Metallic nanocrystals exhibit superior properties to their bulk counterparts because of the reduced sizes, diverse morphologies, and controllable exposed crystal facets. Therefore, the fabrication of metal nanocrystals and the adjustment of their properties for different applications have attracted wide attention. One of the typical examples is the fabrication of nanocrystals encased with high-index facets, and research on their magnified catalytic activities and selections. Great accomplishment has been achieved within the field of noble metals such as Pd, Pt, Ag, and Au. However, it remains challenging in the fabrication of base metal nanocrystals such as Ni, Cu, and Co with various structures, shapes, and sizes. In this paper, the synthesis of metal nanocrystals is reviewed. An introduction is briefly given to the metal nanocrystals and the importance of synthesis, and then commonly used synthesis methods for metallic nanocrystals are summarized, followed by specific examples of metal nanocrystals including noble metals, alloys, and base metals. The synthesis of base metal nanocrystals is far from satisfactory compared to the tremendous success achieved in noble metals. Afterwards, we present a discussion on specific synthesis methods suitable for base metals, including seed-mediated growth, ligand control, oriented attachment, chemical etching, and Oswald ripening, based on the comprehensive consideration of thermodynamics, kinetics, and physical restrictions. At the end, conclusions are drawn through the prospect of the future development direction. View Full-Text
Keywords: nanocrystals; noble metal; base metal; synthesis method nanocrystals; noble metal; base metal; synthesis method
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MDPI and ACS Style

Bai, L.; Ouyang, Y.; Song, J.; Xu, Z.; Liu, W.; Hu, J.; Wang, Y.; Yuan, F. Synthesis of Metallic Nanocrystals: From Noble Metals to Base Metals. Materials 2019, 12, 1497.

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