Rapid microwave-enhanced hydrothermal synthesis and shape evolution of uniform NaGdF 4:Yb, Er (Tm/Ho) nanocrystals with upconversion and paramagnetic properties

Dong Wang*, Lei Ren, Xi Zhou, Xiao Zhong Wang, Jun Zhou, Yu Han, Ning Kang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

An efficient microwave-enhanced hydrothermal synthesis strategy was developed for the rapid synthesis of β-NaGdF 4:Ln 3+ (Ln=Yb, Er/Tm/Ho) nanocrystals (NCs) with multicolour upconversion luminescence and paramagnetic properties. It has been found that the uniform β-NaGdF 4:Ln 3+ NCs could be rapidly formed within a few minutes at 160°C and the shape of the NCs can be manipulated from uniform rod-like to spherical just by tuning the initial reactants concentration. In comparison to conventional hydrothermal routes, a burst homogeneous nucleation and higher growth rate as well as enhanced dimensional homogeneity of the NaGdF 4:Ln 3+ was achieved in microwave synthesis. A microwave-heating-based classical crystallization mode and surfactant-assisted anisotropic growth mechanism were proposed for the formation of β-NaGdF 4:Ln 3+ NCs.

Original languageEnglish (US)
Article number225705
JournalNanotechnology
Volume23
Issue number22
DOIs
StatePublished - Jun 8 2012

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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