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Luminescent Properties of Colloidal Ag2S Quantum Dots for Photocatalytic Applications
Physics of the Solid State ( IF 0.9 ) Pub Date : 2022-05-18 , DOI: 10.1134/s1063783422010140
O. V. Ovchinnikov , M. S. Smirnov , S. V. Aslanov , A. S. Perepelitsa

Abstract

The structural and optical properties of colloidal Ag2S quantum dots in different environments are studied. With the help of transmission electron microscopy, X-ray diffraction analysis, and X-ray Energy-Dispersive analysis, the formation of Ag2S quantum dots with average size of 2–3 nm with monoclinic crystal lattice, and Ag2/SiO2 core–shell systems based on them, has been enstablished. A change in the luminescence quantum yield of the quantum dots in the case of a change of the surface environment is shown. Decoration of TiO2 nanoparticles with a size of 10–15 nm with Ag2S quantum dots is performed and the effect of the structure of the interfaces of the quantum dots and their environment (2-mercaptopropionic acid, water, ethylene glycol, SiO2 dielectric shells with thicknesses of 0.6 and 2.0 nm) on the formation of TiO2–Ag2S heterosystem is analyzed. The signs of charge phototransfer upon adsorption onto the surface of TiO2 nanoparticles are found for the Ag2S quantum dots passivated with 2-mercaptopropionic acid. The signs of appearance of reactive oxygen species as a result of charge phototransfer in a TiO2–Ag2S heterosystem are found based on the observation of photobleaching of methylene blue upon excitation of the system from the region outside of TiO2 fundamental absorption.



中文翻译:

用于光催化应用的胶体 Ag2S 量子点的发光特性

摘要

研究了胶体Ag 2 S量子点在不同环境中的结构和光学性质。借助透射电子显微镜、X射线衍射分析和X射线能量色散分析,形成了平均尺寸为2-3 nm的具有单斜晶格的Ag 2 S量子点,以及Ag 2 /SiO 2基于它们的核壳系统已经建立。示出了在表面环境改变的情况下量子点的发光量子产率的变化。用Ag 2修饰尺寸为10-15 nm的TiO 2纳米粒子进行了S量子点以及量子点界面结构及其环境(2-巯基丙酸、水、乙二醇、厚度为0.6和2.0 nm的SiO 2介电壳)对TiO 2形成的影响-Ag 2 S 异质系统被分析。对于用 2-巯基丙酸钝化的 Ag 2 S 量子点,发现了吸附到 TiO 2纳米颗粒表面后电荷光转移的迹象。TiO 2 –Ag 2中电荷光转移导致活性氧物质出现的迹象S 异质系统是基于在从 TiO 2基本吸收之外的区域激发系统时观察到亚甲蓝的光漂白而发现的。

更新日期:2022-05-18
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