Publication date: 3rd July 2020
The role of the indium carboxylate precursor in the synthesis of monodisperse InP quantum dots has been investigated. We started our investigation by preparing pure, acid-free indium palmitate. The absence of any remaining palmitic acid was assessed by FTIR spectroscopy. Using high-temperature 31P-NMR, we monitored the reaction between this isolated, carboxylic-acid free indium palmitate and tris(trimethylsilyl)phosphine (P(TMS)3). Then we compared the reactivity in the presence of additional carboxylic acid. In the latter case, rapid protonation of P(TMS)3 led to the presence of the various HxP(TMS)3-x species, which in turned led to an ill-controlled formation of InP nanocrystals. The NMR study allowed us to propose optimized conditions for the synthesis of InP nanocrystals with low size dispersity using a simple heat-up process. Indeed, in the absence of free carboxylic acid, InP nanocrystals were generated in a size-focusing regime, without detrimental ripening processes. This key aspect brings a new understanding of InP nanocrystal formation.
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