Aminophosphines derived from N,N’-disubstitutedethylenediamines (R–N(H)CH2CH2N(H)–R; R = o-tolyl, phenyl, benzyl, i-propyl, n-octyl) adjust the kinetics of InP nanocrystal formation by more than an order of magnitude. UV-Visible absorption and 31P nuclear magnetic resonance measurements demonstrate that the rate of nanocrystal formation is limited by the precursor reactivity. At low temperature (180 °C) crystal nucleation is concurrent with growth throughout the reaction, rather than occurring in a burst at early times. Higher temperatures (up to 270 °C) promote growth to larger sizes and shorten the nucleation period, creating conditions where the final size is controlled by the precursor conversion reactivity. The narrow size distributions obtained from reactions without separation of nucleation and growth and the influence of temperature on the final size can be explained by monomer attachment kinetics that are more rapid at small crystal sizes.

Control over InP nanocrystal size using aminophosphine derivatives with tunable reactivity: Continuous nucleation and size dependent growth kinetics

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.