Janus nanoparticle structural motif control via asymmetric cation exchange in edge-protected Cu1.81S@IrxSy hexagonal nanoplates

Jongsik Park, Jisol Park, Jaeyoung Lee, Aram Oh, Hionsuck Baik, Kwangyeol Lee

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Post-synthetic transformation of nanoparticles has received great attention, because this approach can provide an unusual route to elaborately composition-controlled nanostructures while maintaining the overall structure of the template. In principle, anisotropic heteronanoparticles of semiconductor materials can be synthesized via localized, that is, single site, cation exchange in symmetric nanoparticles. However, the differentiation of multiple identical cation exchange sites in symmetric nanoparticles can be difficult to achieve, especially for semiconductor systems with very fast cation exchange kinetics. We posited that single-site cation exchange in semiconductor nanoparticles might be realized by imposing a significant kinetic hurdle to the cation exchange reaction. The different atomic arrangements of the core and crown in core-crown structures might further differentiate the surface energies of originally identical cation exchange sites, leading to different reactivities of these sites. The first cation exchange site would be highly reactive due to the presence of a formed interface, thereby continuing to act as a site for cation exchange propagation. Herein, we present the proof-of-concept synthesis of Janus nanoparticles by using edge-protected Cu1.81S@IrxSy hexagonal nanoplates. The Janus nanoparticles comprising {Au2S-Cu1.81S}@IrxSy or {PdS-Cu1.81S}@IrxSy exhibited dissimilar structural motifs due to the disparate cation exchange directions. This synthetic methodology exploiting cation exchange of surface-passivated semiconductor nanoparticles could fabricate the numerous symmetry-controlled Janus heterostructures.

Original languageEnglish
Pages (from-to)7996-8005
Number of pages10
JournalACS nano
Issue number8
Publication statusPublished - 2018 Aug 28

Bibliographical note

Funding Information:
This work was supported by NRF-2017R1A2B3005682, Korea University Future Research Grant (KU-FRG), Korea University Grant, KBSI project E38300, and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6A3A01008861, 2018R1A6A3A01013426). The authors thank Korea Basic Science Institute (KBSI) for the usage of their HRTEM instrument.

Publisher Copyright:
© 2018 American Chemical Society.


  • Janus nanoparticle
  • asymmetric
  • binary metal sulfide
  • cation exchange reaction
  • copper sulfide

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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