Janus to Core-Shell to Janus: Facile Cation Movement in Cu2-xS/Ag2S Hexagonal Nanoplates Induced by Surface Strain Control

Taekyung Kim, Jongsik Park, Yongju Hong, Aram Oh, Hyunsuck Baik, Kwangyeol Lee

Research output: Contribution to journalArticle

Abstract

Nanocrystals with multiple compositions and heterointerfaces have received great attention due to promising multifunctional and synergistic physicochemical properties. In particular, heterointerfaces have been at the focal point of nanocatalyst research because the strain caused by lattice mismatches between different phases is the dominant determinant of surface energy and catalytic activity. The ensemble effects of different material phases have also contributed to the interest in heterointerfaced multicomponent materials. Until now, heterointerfaces have largely been regarded as static, and the dynamic movement of components within the multicomponent material phases has received little attention, although the dynamic movement of individual components within multicomponent materials can revise the interpretation of the catalytic behaviors of these materials and lead to fascinating opportunities for nanostructure synthesis. In this study, we demonstrate unprecedented cation migrations within a sulfide matrix induced by surface strain modulation initiated by cation exchange. Specifically, Cu and Ag cations in the sulfide matrix were initially segregated to form a Janus structure. This Janus configuration was then transformed into a core-shell Cu2-xS@Ag2S structure via surface Pt doping. When the surface strain was relieved by a reduced Pt concentration at the nanoparticle surface, the core-shell transitioned back into a Janus structure. We expect that the facile composition fluctuations in multiphasic nanostructures will expand synthetic methodologies for the design and synthesis of intricate nanostructures with useful physicochemical properties.

Original languageEnglish
Pages (from-to)11834-11842
Number of pages9
JournalACS Nano
Volume13
Issue number10
DOIs
Publication statusPublished - 2019 Oct 22

Fingerprint

Strain control
Janus
Cations
Positive ions
cations
Nanostructures
sulfides
Sulfides
Shells (structures)
synthesis
matrices
Lattice mismatch
determinants
surface energy
catalytic activity
nanocrystals
Chemical analysis
Interfacial energy
Nanocrystals
methodology

Keywords

  • cation exchange
  • copper sulfides
  • heterostructure
  • Janus nanoparticle
  • surface strain

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Janus to Core-Shell to Janus : Facile Cation Movement in Cu2-xS/Ag2S Hexagonal Nanoplates Induced by Surface Strain Control. / Kim, Taekyung; Park, Jongsik; Hong, Yongju; Oh, Aram; Baik, Hyunsuck; Lee, Kwangyeol.

In: ACS Nano, Vol. 13, No. 10, 22.10.2019, p. 11834-11842.

Research output: Contribution to journalArticle

Kim, Taekyung ; Park, Jongsik ; Hong, Yongju ; Oh, Aram ; Baik, Hyunsuck ; Lee, Kwangyeol. / Janus to Core-Shell to Janus : Facile Cation Movement in Cu2-xS/Ag2S Hexagonal Nanoplates Induced by Surface Strain Control. In: ACS Nano. 2019 ; Vol. 13, No. 10. pp. 11834-11842.
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