CdSe-Dot/CdS-Rod/PbS-Dot Nanocrystals by Partial Cation Exchange Reaction
arxiv(2024)
摘要
Dual-emissive nanorods with fluorescence in both, the visible and infrared
range are prepared by a combination of a CdSe-nanocrystal-seeded growth of CdS
nanorods, and a successive partial Cd-to-Pb cation exchange. We show that the
exchange reaction, which involves Pb halides in oleylamine, starts at the tip
of the rods, leading to the formation of CdSe-dot/CdS-rod/PbS-dot nanocrystals
(DRDs). Besides these DRDs, the reaction product also contains shorter nanorods
and spherical quantum dots. Their fraction strongly depend on the amount of
lead halide precursor and the reaction time. The reaction mechanism is
investigated in detail, such that by carefully adjusting the reaction
conditions, it is possible to synthesize DRDs of distinct PbS-dot sizes with
yields over 95
CdSe-fluorescence band in the visible range at 600 nm, and also a fluorescence
band in the NIR at 1440 nm, resulting from the PbS part of the rods.
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