Individual mesoscopic structures studied with sub-micrometer optical detection techniques: CdSe nanocrystals capped with TOPO and zns-overcoated system
作者： Kenichi Hashizume , Masayuki Matsubayashi , Martin Vacha , Toshiro Tani
DOI: 10.1016/S0022-2313(02)00251-X
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摘要: Abstract The synthesis of semiconductor nanocrystals (CdSe) by pyrolysis organometallic reagents and their optical properties are reported. By controlling the relative amount precursors to be injected into coordinating solvent, e.g. TOPO, we have modified sizes quality successfully, spectrum which shows fairly sharp excitonic spectral features even in a limited size range. Passivation with overcoating ZnS provides large enhancement fluorescence intensity, i.e. quantum efficiency reaches over 50% at room temperature best case. To prepare larger than ∼4.0 nm, 2-step injection CdSe seems suitable, where some TOPO is added separately reaction vessel prior secondary injection. With this additional process ZnS-overcoated high can obtained reproducibility.
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