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

2005; Institute of Physics; Volume: 44; Issue: 1R Linguagem: Inglês

10.1143/jjap.44.452

1347-4065

Takahisa Omata, Katsuhiro Nose, Shinya Otsuka‐Yao‐Matsuo, Hiroyuki Nakamura, Hideaki Maeda,

Gold and Silver Nanoparticles Synthesis and Applications

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.