Photoluminescence of CdSe and CdSe/CdO · nH2O core/shell nanoparticles prepared in aqueous solution

Xingping Zhou, Zhiyu Shao, Yoshio Kobayashi, Xiaqin Wang, Noriaki Ohuchi, Motohiro Taketa, Atsuo Kasuya

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

CdSe sols with different colors were prepared by simply mixing CdSO4 and NaSSeO3 solutions under [Cd2+]/[Se2-] ratios of 2.0-0.4 at room temperature. The nanoparticles, with average sizes of 1.8-3.6 nm, showed relatively narrow photoemission peaks at 522-556 nm. The strongest photoluminescence with a FWHM of 35 nm was obtained under [Cd2+]/[Se2-] ratio of 1.2. The possible mechanism for achieving the strongest photoluminescence was proposed. Photoluminescence of these particles was greatly increased by surface modification of cadmium (II) hydrous oxide. The photoluminescence of these core-shell particles was kept constant in the pH range of 8.0-10.0, but dramatically decreased with an obvious blue-shifted peak while the pH was lower than 8.0. In addition, the photochemical oxidation of CdSe nanoparticles was markedly inhibited after they were modified with cadmium hydrous oxide.

Original languageEnglish
Pages (from-to)1048-1054
Number of pages7
JournalOptical Materials
Volume29
Issue number8
DOIs
Publication statusPublished - 2007 Jan 1

Keywords

  • Cadmium (II) hydrous oxide
  • CdSe
  • Photoluminescence (PL)
  • Stability
  • Surface modification
  • pH

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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  • Cite this

    Zhou, X., Shao, Z., Kobayashi, Y., Wang, X., Ohuchi, N., Taketa, M., & Kasuya, A. (2007). Photoluminescence of CdSe and CdSe/CdO · nH2O core/shell nanoparticles prepared in aqueous solution. Optical Materials, 29(8), 1048-1054. https://doi.org/10.1016/j.optmat.2006.04.003