Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
In depth understanding of nucleation and growth kinetics in nanocrystal synthesis is particularily important for discovery of novel materials as well as for the optimization of existing synthetic pathways. We present a continuous flow microfluidic reactor with integrated real-time absorbance detection that allows us to precisely control reaction temperature, reagent mixture as well as reaction time at sub-second precision. The use of this reactor in conjunction with a kinetic theory of nucleation and growth provides an elegant way to quantifiy the effects of precursor concentration, reaction temperature and additive concentration on the conversion, growth and diffusion rates in CdSe nanocrystal synthesis. After validating the model we show that precursor conversion obeys a first order rate law and that the influence of the reaction temperature on the growth rate is stronger than on the conversion rate. Furthermore, we confirm that diphenylphosphine, a common additive in CdSe synthesis, enhaces the reaction rate by accelerating the precursor conversion. Conversely, surfactant retards the reaction by hindering the diffusion of monomer to the growing crystals without affecting the conversion rate.
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