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Namyslak, Marek
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article
Luminescent cellulose fibers activated by Eu <sup>3+</sup>-doped nanoparticles
Abstract
<p>UV- active cellulose fibers were obtained by dry-wet method spinning an 8 % by weight α-cellulose solution in N-methylomorpholine-N-oxide (NMMO) modified by europium-doped gadolinium oxyfluoride Gd <sub>4</sub>O <sub>3</sub>F <sub>6</sub>:Eu <sup>3+</sup> containing 5 mol (%) of the dopant. Photoluminescent nanoparticles were introduced in the in powder form into a polymer matrix during the process of cellulose dissolution in NMMO. The dependencies of emission intensity on excitation energy and the concentration of Gd <sub>4</sub>O <sub>3</sub>F <sub>6</sub>:Eu <sup>3+</sup> nanoparticles in the final cellulosic products were examined by photoluminescence spectroscopy (excitation and emission). The fiber structure was studied by X-ray powder diffraction analysis. The size and dispersity of the nanoparticles in the polymer matrix were evaluated using scanning electron microscopy and X-ray microanalysis. The influence of different concentration particles (in the range from 0. 5 to 5 % by weight) on the mechanical properties of the fibers, such as tenacity and elongation at break, were determined. © 2012 The Author(s).</p>