Publication date: 17th July 2025
For nearly two decades, CdSe nanoplatelets (NPLs) have captured the spotlight as promising materials for optoelectronic applications, from LEDs to displays, thanks to their exceptional optical properties. Yet, lacks in understanding their formation often lead to low yields, unwanted side products, and unclear surface chemistry – limiting their use in devices. We demonstrate that the preparation method of the cadmium carboxylate precursors plays a critical role in the quality and optical properties of the formed NPLs. We focused our study on cadmium oleate and myristate, the most commonly used precursors in CdSe NPLs synthesis. Using a combination of thermal analysis (TGA), FT-IR and SAXS, we reveal clear differences in the structure and crystallinity of these precursors. In situ SAXS studies show that these structural variations affect the precursor’s dissolution kinetics during synthesis, ultimately affecting NPLs thickness and uniformity. These findings are supported by UV-Vis spectroscopy and TEM, highlighting the strong link between precursor structure and NPLs properties.
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