Dimension-controlled synthesis of CdS nanocrystals: From 0D quantum dots to 2D nanoplates

Jae Sung Son, Kunsu Park, Soon Gu Kwon, Jiwoong Yang, Moon Kee Choi, Junhyeong Kim, Jung Ho Yu, Jin Joo, Taeghwan Hyeon

Research output: Contribution to journalArticlepeer-review

106 Scopus citations

Abstract

The dimension-controlled synthesis of CdS nanocrystals in the strong quantum confinement regime is reported. Zero-, one-, and two-dimensional CdS nanocrystals are selectively synthesized via low-temperature reactions using alkylamines as surface-capping ligands. The shape of the nanocrystals is controlled systematically by using different amines and reaction conditions. The 2D nanoplates have a uniform thickness as low as 1.2 nm. Furthermore, their optical absorption and emission spectra show very narrow peaks indicating extremely uniform thickness. It is demonstrated that 2D nanoplates are generated by 2D assembly of CdS magic-sized clusters formed at the nucleation stage, and subsequent attachment of the clusters. The stability of magic-sized clusters in amine solvent strongly influences the final shapes of the nanocrystals. The thickness of the nanoplates increases in a stepwise manner while retaining their uniformity, similar to the growth behavior of inorganic clusters. The 2D CdS nanoplates are a new type of quantum well with novel nanoscale properties in the strong quantum confinement regime.

Original languageEnglish
Pages (from-to)2394-2402
Number of pages9
JournalSmall
Volume8
Issue number15
DOIs
StatePublished - 6 Aug 2012

Keywords

  • clusters
  • nanocrystalline materials
  • nanoplates
  • nanorods
  • quantum dots

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