Smart Optical Composite Materials: Dispersions of Metal-Organic Framework@Superparamagnetic Microrods for Switchable Isotropic-Anisotropic Optical Properties

Journal article
(Original article)


Publication Details

Author(s): Mandel K, Granath T, Wehner T, Rey M, Stracke W, Vogel N, Sextl G, Mueller-Buschbaum K
Journal: Acs Nano
Publisher: American Chemical Society
Publication year: 2017
Volume: 11
Journal issue: 1
Pages range: 779-787
ISSN: 1936-0851


Abstract

A smart optical composite material with dynamic isotropic and anisotropic optical properties by combination of luminescence and high reflectivity was developed. This combination enables switching between luminescence and angle-dependent reflectivity by changing the applied wavelength of light. The composite is formed as anisotropic core/shell particles by coating superparamagnetic iron oxide-silica microrods with a layer of the luminescent metal-organic framework (MOF) 3$ınfty$[Eu2(BDC)3]·2DMF·2H2O (BDC2- = 1,4-benzenedicarboxylate). The composite particles can be rotated by an external magnet. Their anisotropic shape causes changes in the reflectivity and diffraction of light depending on the orientation of the composite particle. These rotation-dependent optical properties are complemented by an isotropic luminescence resulting from the MOF shell. If illuminated by UV light, the particles exhibit isotropic luminescence while the same sample shows anisotropic optical properties when illuminated with visible light. In addition to direct switching, the optical properties can be tailored continuously between isotropic red emission and anisotropic reflection of light if the illuminating light is tuned through fractions of both UV and visible light. The integration and control of light emission modes within a homogeneous particle dispersion marks a smart optical material, addressing fundamental directions for research on switchable multifunctional materials. The material can function as an optic compass or could be used as an optic shutter that can be switched by a magnetic field, e.g., for an intensity control for waveguides in the visible range.


FAU Authors / FAU Editors

Rey, Marcel
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Vogel, Nicolas Prof. Dr.
Professur für Partikelsynthese


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


External institutions with authors

Fraunhofer Institut für Silicatforschung (ISC)
Julius-Maximilians-Universität Würzburg


Research Fields

A1 Functional Particle Systems
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Mandel, K., Granath, T., Wehner, T., Rey, M., Stracke, W., Vogel, N.,... Mueller-Buschbaum, K. (2017). Smart Optical Composite Materials: Dispersions of Metal-Organic Framework@Superparamagnetic Microrods for Switchable Isotropic-Anisotropic Optical Properties. Acs Nano, 11(1), 779-787. https://dx.doi.org/10.1021/acsnano.6b07189

MLA:
Mandel, Karl, et al. "Smart Optical Composite Materials: Dispersions of Metal-Organic Framework@Superparamagnetic Microrods for Switchable Isotropic-Anisotropic Optical Properties." Acs Nano 11.1 (2017): 779-787.

BibTeX: 

Last updated on 2019-14-03 at 11:54