Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 336, Issue 1, Pages 171-175Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2009.04.024
Keywords
Nanoparticles; Upconversion; NaYF4; Hexanedioic acid; Ligand exchange; Biological application
Categories
Funding
- NSFC of China [20603035, 60601014, 60601015]
- National High Technology Development Program [2006AA03Z335]
- CAS of China and KNAW of the Netherlands
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Water-soluble and carboxyl-functionalized up-converting rare-earth nanoparticles (UCNPs) are obtained via an efficient surface-ligand-exchange procedure. Hexanedioic acid molecules are employed to replace the original hydrophobic ligands in diethylene glycol solvent at high temperature. Various characterizations indicate the ligand-exchange process has negligible adverse effect on the quality of the UCNPs. The resulting hydrophilic UCNPs show small size, strong up-converting emission and high water stability. The specific molecular recognition capacity of avidin-modified hydrophilic UCNPs confirms that hydrophilic UCNPs are suitable for potential biological labeling. Crown Copyright (C) 2009 Published by Elsevier Inc. All rights reserved.
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