L. Maggini, M. Liu, Y. Ishida, D. Bonifazi,
Adv. Mater. (Weinheim, Ger.) 2013, 25, 2462-2467
The anisotropic emission properties of an Eu(III)-MWCNTs-based nanocomposite PNIPAAm hydrogel is induced upon application of a 10 T magnetic field, the latter dictating the alignment of the carbon nanotubes. This structuration creates directional highways for light to be preferentially absorbed, giving rise to orientation-dependent light emission intensity. Thermal control of the transparency of the aqueous matrix also allowed a stimulus-induced switching of the materials’ emission properties.