Wet-chemical synthesis is a classic method for metal nanostructures with scalability and relatively low cost. Various shapes, sizes, and crystal phases of metal nanocrystals can be obtained by simply tuning the reaction parameters. In this poster, our recent work on the crystal phase engineering of noble metal structures via wet-chemical routes is introduced. First, colloidal solution based syntheses of Au nanostructures with unconventional crystal phases, including hexagonal close-packed (hcp), 4H, and 4H/face-centered cubic (fcc) crystal phase heterostructures, are summarized. Second, we report the surface modification-induced phase transformation of Au nanosquare sheets from hcp to fcc and of Au nanoribbons from 4H to fcc. Third, the templated epitaxial growth of single- and multi-metallic 4H and 4H/fcc noble metals on 4H Au nanoribbons and 4H/fcc nanonrods to form various core-shell heterostructures are introduced. Both epitaxial growth and random continuous growth have be realized. Last but not the least, as a proof of concept, the superior catalytic performance of Au@PdAg nanoribbons on hydrogen evolution reaction and 4H/fcc Au@Pd nanorods on ethanol oxidation reaction are demonstrated.

Solution-based crystal phase engineering of noble metal nanostructures

256th National Meeting (2018)

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