Evolution of Two Types of CdTe Magic-Size Clusters from a Single Induction Period Sample

The Journal of Physical Chemistry Letters
Chaoran LuanKui Yu

Abstract

There are two types of colloidal semiconductor nanocrystals (NCs) that exhibit band gap absorption that is relatively sharp compared to conventional quantum dots (QDs). One type displays an absorption doublet, while the other displays an absorption singlet. Here, we report the evolution of the two types of NCs at room temperature from a single CdTe sample extracted during the induction period (IP) prior to nucleation and growth of conventional QDs. The resulting NCs exhibit band gap absorption peaking at ∼371 nm and are magic-size clusters (MSCs), labeled as dMSC-371 and sMSC-371 for the doublet and singlet cases, respectively. We demonstrate that dMSC-371 (with another peak at ∼350 nm) evolves when the sample is incubated. When the sample is dispersed without incubation into a toluene and octylamine mixture, dMSC-371 or sMSC-371 grows depending on the amine amount. We propose that dMSC-371 and sMSC-371 are a pair of polymorphs (with identical CdTe core compositions). The present study brings insight into the formation relationship between dMSCs and sMSCs.

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Citations

Jun 20, 2020·Angewandte Chemie·Hai ZhangKui Yu
Feb 4, 2021·Accounts of Chemical Research·Li HeKui Yu
Feb 25, 2021·Research : a Science Partner Journal·Evan T VickersJin Z Zhang
Apr 27, 2021·The Journal of Physical Chemistry Letters·W Y Córdoba-CamachoV S Stolyarov
Feb 1, 2020·ACS Nano·Cristina PalenciaKlaus Boldt
Oct 24, 2018·The Journal of Physical Chemistry Letters·Yuanyuan LiuKui Yu
Jul 23, 2019·The Journal of Physical Chemistry Letters·Chaoran LuanKui Yu
May 15, 2019·The Journal of Physical Chemistry Letters·Jing ZhangKui Yu
May 16, 2019·The Journal of Physical Chemistry Letters·Yuanyuan LiuKui Yu
Dec 17, 2019·The Journal of Physical Chemistry Letters·Shangpu LiuBin Liang
Nov 30, 2021·Angewandte Chemie·Yusha YangKui Yu

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