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    Spatiotemporal analysis of structured Langmuir films formed from stabilised CdSe/CdS/ZnS quantum dots

    Year: 2023

    Journal: Materials Letters, Volume 333, 01/02/2023, page 133472

    Authors: Novikov, Evgeny; Kuzmenko, Alexander; Pugachevskii, Maxim; Rodionov, Vladimir; Zavodinsky, Victor; Gorkusha, Olga; Anikin, Dmitry; Syuy, Alexander; Krylsky, Dmitry; Than, Myo Min

    Keywords: Langmuir-Blodgett film; Calculations ab-initio; CdSe/CdS/ZnS; Kinetic formation; Quantum dots; Semiconductor core/double shells

    Langmuir-Blodgett Films (LBFs) were studied using X-ray Diffraction (XRD), Raman Scattering (RS), Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDX), Transmission Electron Microscopy (TEM), High Resolution TEM (HRTEM), Electronic Data Processing (EDP), Atomic Force Microscopy (AFM), and ab-initio simulations. Unlike in the classical form of compression isotherms π(t), the transition to the time dependence Δπ(t) = π(t2) - π(t1) made it possible to reveal the "liquid–solid phase" transition starting from 500 s to 650 s, and nanofilm collapse after 1400 s as illustrated by Brewster images. According to AFM, HRTEM images, and XRD data, it is established that the formation of an LBF from CdSe/CdS/ZnS quantum dots is accompanied by a structural transition from sphalerite to dominant wurtzite close packing, which is in qualitative agreement with the results from combinatorial geometry and ab-initio calculations. The dominance of the wurtzite crystal structure was established by X-ray diffraction, HRTEM and RS methods.
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