Synthesis of CdSe quantum dots using micro-flow reactor and their optical properties

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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 300s. 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.

Original languageEnglish
Pages (from-to)452-456
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number1 A
DOIs
Publication statusPublished - 2005 Jan 1
Externally publishedYes

Keywords

  • Cadmium selenide
  • Micro-flow reactor
  • Particle size
  • Photoluminescence spectra
  • Quantum dots
  • Semiconductor

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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