Structurally well-defined heteronanoparticles have received great attention because their distinct structural features can be altered to achieve unprecedented properties. The cation exchange reaction, one of the most powerful techniques to synthesize heteronanoparticles, can tune the regiospecific composition of nanoparticles while maintaining the overall morphology of the template. Herein, we demonstrate that the nascent interface between the cation-exchanged region and the unchanged template can induce a significant tensile or compressive strain on the lattice of the template so that the cation exchange process at the interface can be greatly facilitated. The fate of the overall cation exchange reaction can be dictated by placing the initial cation exchange sites on the template regioselectively. Via a careful kinetic and thermodynamic control of the cation exchange, we could prepare two completely different nanostructures of Cu5FeS4/Cu2-xS/Cu5FeS4 nanosandwich and Cu5FeS4/Cu2-xS Janus nanoparticle. The synthetic concept described in this study could be further extended to the synthesis of various rationally designed multiphasic nanoparticles with exciting physicochemical properties.
Bibliographical noteFunding Information:
This work was supported by NRF-2017R1A2B3005682, NRF-2019R1A6A1A11044070, NRF-2019R1A6A3A03033404, and the Korea Basic Science Institute under the R&D program (project no. C38530) supervised by the Ministry of Science. The authors thank the Korea Basic Science Institute (KBSI) for the usage of their HRTEM instrument.
© 2019 American Chemical Society.
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- Materials Chemistry