Установлено десятикратное увеличение квантового выхода дефектной люминесценции в области 750 nm при одновременном росте времени ее затухания с 4 до 200 ns, обусловленные декорированием поверхности квантовых точек (КТ) Ag2S/SiO2 (5.0±1.5 nm) наночастицами (НЧ) Au (2.0±0.5 nm). На основе анализа кинетики люминесценции при температурах 77 и 300 K сделано заключение о том, что такое неспецифичное проявление плазмон-экситонного взаимодействия вызвано влиянием поляризационных эффектов от НЧ Au на свойства мелких ловушек, участвующих в формировании кинетики дефектной люминесценции КТ Ag2S/SiO2. Ключевые слова: ИК люминесценция; кинетика затухания люминесценции; квантовые точки, плазмонные наночастицы, плазмон-экситонное взаимодействие.
The paper presents regularities that demonstrate the effect of passivating ligands formation of thioglycolic acid and L-cysteine (TGA, L-Cys) and dielectric shells (SiO2) on Ag2S nanocrystals interface on the photostability of their IR luminescence. Using FTIR absorption spectroscopy, the interaction manifestations of passivating ligands molecules of TGA and L-Cys with Ag2S nanocrystals, as well as the formation of SiO2 shell due to the process of replacing organic ligands with a silica ligand (MPTMS) ("ligand exchange"), were found. In the case of replacing TGA with MPTMS, an increase in the luminescence quantum yield of Ag2S quantum dots (QDs) and its resistance to long-term exposure to exciting radiation was found. In the case of replacing L-Cys with MPTMS, the formation of a fragmentary SiO2/L-Cys shell on Ag2S nanocrystals was observed due to the partial replacement of L-Cys with MPTMS, which contributes to the reverse photodegradation of Ag2S QDs luminescence of as a result of SiO2/L-Cys shell photodestruction.
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