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Dimension‐Controlled Synthesis of CdS Nanocrystals: From 0D Quantum Dots to 2D Nanoplates
Author(s) -
Son Jae Sung,
Park Kunsu,
Kwon Soon Gu,
Yang Jiwoong,
Choi Moon Kee,
Kim Junhyeong,
Yu Jung Ho,
Joo Jin,
Hyeon Taeghwan
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201200506
Subject(s) - nanocrystal , quantum dot , nucleation , materials science , nanotechnology , photoluminescence , absorption (acoustics) , absorption spectroscopy , nanoscopic scale , potential well , solvent , chemical physics , chemical engineering , optoelectronics , chemistry , composite material , optics , physics , organic chemistry , engineering
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.