Templated Growth of InP Nanocrystals with a Polytwistane Structure

Abstract

We have synthesized InP nanocrystals of an unprecedented crystal phase at low temperature (35-100 °C) by templated growth of InP magic-sized clusters. With the addition of stoichiometric equivalents of P(SiMe ) to the starting cluster, we demonstrate nanocrystal growth mediated through a partial dissolution and recrystallization pathway. This growth process was monitored using a combination of in situ UV/Vis and P NMR spectroscopy, revealing the intermediacy of smaller cluster species of higher symmetry. The nanocrystals that result from this templated growth exhibit a crystal structure that is neither zincblende nor wurtzite, and instead is derived from the original cluster. This structure is best described as a 3D polytwistane phase as deduced from a combination of X-ray diffraction, Raman, and solid-state NMR spectroscopy methods.

Fragmentation of Magic‐Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures

“…[21] Our findings provide ap ractical means to synthesize small-size QDs with enhanced particle yield via the fragmentation of the PC of MSCs at low temperatures.W ith the two-pathway model, [19] we have been able to understand better the synthetic procedure and result. Embracing the advances in the classical and non-classical nucleation theories and in the QD synthesis, [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]56] the nanocrystal synthesis is transforming from an empirical art to science.…”

Fragmentation of Magic‐Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures

“…With the two‐pathway model, we have been able to understand better the synthetic procedure and result. Embracing the advances in the classical and non‐classical nucleation theories and in the QD synthesis, the nanocrystal synthesis is transforming from an empirical art to science.…”

Gewinner der ACS National Awards 2019

“…Sie stellen Moleküle und Materialien her, die Licht abstrahlen oder sich für katalytische Anwendungen eignen, zum Beispiel III‐V‐Nanostrukturen und ‐Cluster, und sie entwerfen kolloidale und homogene Katalysatoren und elektrokatalytische Grenzflächen. In einer Angewandte‐Chemie ‐Zuschrift berichteten sie über den Aufbau von InP‐Nanokristallen mit Polytwistan‐Struktur …”