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[摘要]：The kinetics and mechanism of Bi-nanocrystal growth from the precursor Bi[N(SiMe3)(2)](3) are determined at various Na[N(SiMe3)(2)] additive concentrations. The results establish that aggregative nucleation and growth processes dominate Bi-nanocrystal formation. The time dependence of the aggregative nucleation rate-the nucleation function-is determined over the range of Na[N(SiMe3)(2)] concentrations studied. The time width of aggregative nucleation (Delta t(n)) is shown to remain reasonably narrow, and to correlate with the final Bi-nanocrystal size distribution. The maximum aggregative nucleation rate (Gamma(max)) is shown to vary systematically with Na[N(SiMe3)(2)] concentration, producing a systematic variation in the final nanocrystal mean size. The Na[N(SiMe3)(2)] additive functions as both a nucleation-control agent and an Ostwald-ripening agent. |
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