EDTA-directed CdS nanoparticle formation and agglomeration
In-situ experiments of nanoparticle (NP) formation have been in the focus of research over the last decade to track particle size, shape, structure and properties. For long-term stability of NPs in applications, ligands are added. However, most studies of nucleation and crystallization were carried out without ligands. In earlier studies on the formation of CdS NPs from aqueous solutions of CdCl2 and Na2S, it was found, that two steps occur. First, 1 nm precursors form in < 100 µs, which then assemble to particles of ca. 2.5 nm in diameter, further growing over time. In presence of the ligand EDTA (ethylenediaminetetraacetate), the nucleation and growth process is altered. While SAXS and TEM data indicate the existence of ca. 6 nm particles only, recent in-situ SANS measurements showed an increasing structure with ca. 120 nm diameter on the timescale of hours against our expectations. We hypothesize that the EDTA molecules create agglomerates of 120 nm which yet seem to be stable in dispersion over hours or days. With this proposal we want to investigate the evolution and kinetics of these EDTA-CdS-agglomerates and use contrast matching to highlight the CdS cores and ligand shells.
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Mirijam Zobel; ECKARDT Mirco; KRAUSS Sebastian and SCHWEINS Ralf. (2019). EDTA-directed CdS nanoparticle formation and agglomeration. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-485
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