Synthesis of CdSe Quantum Dots Using Micro-Flow Reactor and Their Optical Properties

概要

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CdSe quantum dots (QDs) have been synthesized continuously at 200–320°C using a micro-flow reactor. Instead of the usual tri-$n$-octylphosphineoxide (TOPO)-tri-$n$-octylphosphine (TOP) solvent, octadecene (ODE)-oleic acid-TOP mixed solvent was used in the present study. Because the ODE-oleic acid-TOP solvent is in liquid form at room temperature, it enabled us to handle the reaction solution at room temperature. The particle size of the QDs synthesized at 250°C was controlled between 3.4 to 4.2 nm by changing the reaction time from 3 to 300 s. Clear photoluminescence was observed at 509 nm for 3.4 nm particles and at 578 nm for 4.2 nm particles. In comparison with the QDs synthesized using a small batch reactor, the particle size distribution of the QDs synthesized using the micro-flow reactor was distinctly sharp. The sharp particle distribution came from the accurate controllability of reaction temperature and time due to the short representative length of the micro-flow reactor.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-01-15