Copper Can Still Be Epitaxially Deposited on Palladium Nanocrystals To Generate Core–Shell Nanocubes Despite Their Large Lattice Mismatch

Abstract

Here we report the synthesis of Pd@Cu core-shell nanocubes via epitaxial growth, where the lattice mismatch is 7.1%. The synthesis involved the use of Pd seeds with different shapes (including cubes, cuboctahedra, and octahedra) for the epitaxial growth of Cu shells. Different from the conventional growth mode, Cu atoms initially nucleated only on a few of the many faces of a Pd seed, onto which more Cu atoms were continuously added to generate Cu blocks. Later, the Cu atoms also started to nucleate and grow on other faces of the Pd seed until the entire surface of the seed was covered by a Cu shell. As a result, the Pd seed was rarely located in the center of each core-shell structure. The final product took a cubic shape enclosed by {100} facets regardless of the type of Pd seeds used because of the selective capping of Cu(100) surface by hexadecylamine. The edge lengths of the Pd@Cu nanocubes could be tuned from 50 to 100 nm by varying the amount of Pd seeds while keeping the amount of CuCl(2) precursor.

Unconventional solution-phase epitaxial growth of organic-inorganic hybrid perovskite nanocrystals on metal sulfide nanosheets

“…It has been known that to realize epitaxial heterostructures, a small misfit in both lattice symmetry and lattice parameters is usually required to achieve a minimum interfacial energy. Some exceptions have also been reported especially in recent cases of using van der Waals layered materials as substrates which are free from surface dangling bonds to effectively tolerate strains arising from a large symmetry/lattice mismatch [49][50][51][52][53]. Examples include recent demonstrations of epitaxial overgrowth of Pt(101) on MoS 2 (001) [49] and PbSe(001) on Bi 2 Se 3 (001) [50].…”

Shape-Controlled Synthesis of Colloidal Metal Nanocrystals: Thermodynamic versus Kinetic Products

“…For example, we found that surface diffusion had a great impact on the asymmetric growth of Cu on a Pd cubic seed. 67 The growth of Cu involved the reduction of CuCl 2 by glucose at 100 °C in the presence of 18-nm Pd cubes as seeds and hexadecylamine as a capping agent for Cu{100} facet. In the initial stage ( Figure 15A), Cu atoms only nucleated and grew on one or two of the side faces of a Pd cubic seed.…”

Shape control of bimetallic nanocatalysts through well-designed colloidal chemistry approaches

“…25 In a very recent work of Xia and co-workers, Cu could still be epitaxially deposited on Pd seeds to form Pd@Cu core-shell nanocubes in hexadecylamine, despite the lattice mismatch between Cu and Pd being 7.1%. 32 This result may be due to the strong affinity between Pd and Cu. Another driving force is the decrease of the surface energy of NCs.…”