Colloidal Metal Nanocrystals with Metastable Crystal Structures

In addition to the conventional knobs such as composition, size, shape, and defect structure, the crystal structure (or phase) of metal nanocrystals offers a new avenue for engineering their properties. Various strategies have recently been developed for the fabrication of colloidal metal nanocrystals in metastable phases different from their bulk counterparts. With a focus on noble metals, we begin with a brief introduction to their atomic packing, followed by a discussion about five major synthetic approaches to their colloidal nanocrystals in unconventional phases. We then highlight the success of synthesis in terms of mechanistic insights and experimental controls, as well as the enhanced catalytic properties. We end this Minireview with perspectives on the remaining issues and future opportunities.

Automated summary

This article discusses the importance of crystal structure in engineering the properties of metal nanocrystals, with a focus on noble metals. Various strategies for fabricating colloidal metal nanocrystals in unconventional phases have been developed, highlighting mechanistic insights, experimental controls, and enhanced catalytic properties. The article concludes with perspectives on remaining issues and future opportunities.