Himmelstoss, Sandy F. and Hirsch, Thomas (2019) Long-Term Colloidal and Chemical Stability in Aqueous Media of NaYF4-Type Upconversion Nanoparticles Modified by Ligand-Exchange. PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION, 36 (10): 1900235. ISSN 0934-0866, 1521-4117
Full text not available from this repository. (Request a copy)Abstract
Surface capping is an essential component of nanoparticles as it provides access to their outstanding properties in the real world. Upconversion nanoparticles are predominantly interesting for use in biological environments, due to their excellent optical properties such as the conversion of near-infrared excitation light into emissions in the visible or UV range of the spectrum, high photostability, and the absence of any intermittence. One of the most efficient upconversion nanoparticles, consisting of lanthanide doped NaYF4, suffers from limited stability in aqueous media. This study investigates a set of five types of surface coatings, ranging from small ligands to polymers of different charge and different coordinating groups, on monodisperse 28 +/- 0.9 nm sized NaYF4(Yb,Er) nanoparticles modified by a two-step ligand exchange mediated by NOBF4. Information on the long-term chemical and colloidal stability for highly diluted aqueous dispersions of these particles is acquired by transmission electron microscopy, dynamic light scattering, and luminescence spectroscopy. The findings are of importance for the development of probes and labels based on upconversion nanoparticles for biological applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DISINTEGRATION; NANOMATERIALS; NANOCRYSTALS; MECHANISM; ENERGY; PHASE; SHELL; chemical stability; colloidal stability; nanoparticles; surface modification; upconversion |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Apr 2020 05:40 |
| Last Modified: | 01 Apr 2020 05:40 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26458 |
Actions (login required)
 |
View Item |
