Multiscale structuring of CdSe/CdS/ZnS quantum dots in spin-coated and Langmuir films

A comparative analysis of the features of multiscale structuring of Langmuir and spin-coated films from stabilized TOPO (trioctylphosphine oxide) quantum dots CdSe/CdS/ZnS was carried out using optical, probe and electron microscopy methods, including high-resolution microscopy and elemental energy-dispersive analysis. The chemical structure was studied by Raman scattering, IR Fourier spectroscopy, and X-ray diffractometry. It was shown that Langmuir nanofilms built on the phenomena of self-organization are characterized by higher continuity and homogeneity, while in spin-coated films they form clusters with sizes ranging from tens to hundreds of nanometers. Calculations ab initio were performed using the electron density functional method for Cd$_n$Se$_n$ nuclei, which indicated the dominance of hexagonal close packing.