Transformative two-dimensional layered nanocrystals

Sohee Jeong, Jae Hyo Han, Jung Tak Jang, Jung Wook Seo, Jin Gyu Kim, Jinwoo Cheon

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


Regioselective chemical reactions and structural transformations of two-dimensional (2D) layered transition-metal chalcogenide (TMC) nanocrystals are described. Upon exposure of 2D TiS2 nanodiscs to a chemical stimulus, such as Cu ion, selective chemical reaction begins to occur at the peripheral edges. This edge reaction is followed by ion diffusion, which is facilitated by interlayer nanochannels and leads to the formation of a heteroepitaxial TiS2-Cu2S intermediate. These processes eventually result in the generation of a single-crystalline, double-convex toroidal Cu2S nanostructure. Such 2D regioselective chemical reactions also take place when other ionic reactants are used. The observations made and chemical principles uncovered in this effort indicate that a general approach exists for building various toroidal nanocrystals of substances such as Ag2S, MnS, and CdS.

Original languageEnglish
Pages (from-to)14500-14503
Number of pages4
JournalJournal of the American Chemical Society
Issue number37
Publication statusPublished - 2011 Sept 21

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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