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Environmentally benign nanocrystals: challenges and future directions
함동효,Donghyun Ko,정병국,Sohee Jeong,Jaehoon Lim,Wan Ki Bae,Changhee Lee,Kookheon Char 한국정보디스플레이학회 2019 Journal of information display Vol.20 No.2
Colloidal semiconductor nanocrystals, referred to as quantum dots (QDs), have unique and superb photophysical properties, promising a variety of applications ranging from optoelectronics and energy harvesting to agriculture. The last decade witnessed a tremendous advance in QDs and their successful debut in displays, and now, QDs are equipped with environmental benignity to expand their territory to everyday life. From this perspective, the current research status and future perspective of environmentally benign QDs as building blocks for light-generating and light-harvesting applications are provided. Also provided is an overview of the progress made in the chemistry (colloidal synthesis, surface chemistry, and heterostructuring) and in their photophysical and electrical properties from the viewpoint of their use in light-emitting or light-harvesting applications. Grounded on the current status of heavy-metal-free QDs compared with cutting-edge technologies, the perspective of environmentally benign QDs for practical use and future research directions is discussed.
Investigation of Surface Reaction Chemistry between Semiconductor Nanocrystals and Precursors
최영호,임재훈,함동효,장준혁,배완기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Formation and growth of semiconductor nanocrystals (NCs) have been first understood as an analogy to classical colloid theory based on thermodynamic aspects. And molecular spectroscopies enable to uncover the reaction chemistry of precursors behind their growth phenomena, for example, coordination of precursors or intermediates, surface coordination of ligands, and so on. However, there is a missing chain bridging the macroscopic NCs’ growth with the microscopic precursor reaction. To unveil the growth process of NCs in molecular scale, herein, we investigated the reaction intermediates produced from reaction precursors and NCs’ surface. Using <SUP>31</SUP>P NMR, ¹H DOSY and XPS, we discovered that the surface adsorption of precursors and their reaction accompany with the carboxylate transfer to incoming P-based ligands. This surface-initiated reaction pathway allows us not only to understand the growth mechanism of NCs, but also to apply it for preparing high quality core/shell quantum dots.