Issue 45, 2020

An in situ and real time study of the formation of CdSe NCs

Abstract

Magic Size Clusters (MSCs) have been identified in the last few years as intermediates in the synthesis of nanocrystals (NCs), and ever since there has been increased interest in understanding their exact role in the NC synthesis. Many studies have been focused on understanding the influence of precursors or ligands on the stability of MSCs and on whether the presence of MSCs influences the reaction pathway. However, their kinetic nature calls for an in situ temporal evolution study of the reaction, from the first seconds until the formation of regular nanocrystals, in order to unravel the role of MSCs in the formation of NCs. We have studied the synthesis of CdSe nanocrystals (NCs) in a continuous-flow reactor with in situ optical and small angle X-ray scattering characterization (SAXS). Our results show that MSCs are always formed, regardless the temperature, as necessary intermediates in the formation of CdSe NCs, and that their accumulation in solution depends only on the reaction time. These results explain why MSCs were, in some cases, not observed in some previous studies.

Graphical abstract: An in situ and real time study of the formation of CdSe NCs

Supplementary files

Article information

Article type
Communication
Submitted
10 aug 2020
Accepted
23 okt 2020
First published
26 okt 2020
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2020,12, 22928-22934

An in situ and real time study of the formation of CdSe NCs

C. Palencia, R. Seher, J. Krohn, F. Thiel, F. Lehmkühler and H. Weller, Nanoscale, 2020, 12, 22928 DOI: 10.1039/D0NR05879C

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