期刊
CHEMISTRY OF MATERIALS
卷 25, 期 8, 页码 1443-1449出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm3035592
关键词
tetrapods; continuous precursor injection; halide ligands; kinetic growth; shape control
资金
- NRF
- MEST
- BK21Program
- SNU Brain Fusion
- MKE for renewable energy research
- National Creative Research Initiative Center for Intelligent Hybrids [20100018290]
- WCU Program [R31-10013]
- Technology Development Program to Solve Climate Changes [NRF-2009-C1AAA001-2009-0093282]
- Leading Foreign Research Institute Recruitment Program [2011-0030065]
- IRTG: Self Organized Materials for Optoelectronics
- DFG (Germany)
- NRF (Korea)
We report scalable controlled synthesis of CdSe tetrapods with high morphological uniformity based on the continuous precursor injection (CPI) approach with halide ligands. The CPI approach involves the successive injection of precursors into the seed solution at a controlled rate so that the reaction condition remains in the kinetic growth regime. To initiage the successful development of tetrapod structure, the controlled amount of halide ligands are added during the reaction, which triggered the formation of wurtzide arms on {111}-facets of the zincblende seeds. The formation of the wurtzite phase is responsible for the halide-mediated displacement of oleate ligands, destabilizing the embryonic CdSe phase on the zincblende seeds enabling the phase transformation to more stable wurtzite phase on the hexagonal {111}-facets. On the basis of these halide-mediated phase transformation of CdSe nanocrystals and the persistent kinetic growth induced by the CPI approach, well-defined CdSe tetrapods with controlled arm length and diameter have been produced in large quantity.
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