Regensburg 2016 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 2: Nano- and microstructured dielectrics / thin films (DF, KR)
KR 2.6: Vortrag
Donnerstag, 10. März 2016, 11:30–11:50, H26
Electrospun dye-doped polymeric fiber networks for alcohol vapor detection — •Sarah Krämmer1, Fabrice Laye1, Christoph Vannahme2, Minh Tran1, Pascal Kiefer1, Felix Friedrich1, Cameron L. C. Smith2, Ana C. Mendes3, Ioannis S. Chronakis3, Anders Kristensen2, and Heinz Kalt1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 2Department of Micro- and Nanotechnology, Technical University of Denmark (DTU), 2800 Kgs., Lyngby, Denmark — 3Nano-BioScience Research Group, DTU-Food, Technical University of Denmark (DTU), 2800 Kgs., Lyngby, Denmark
Recently we have shown that random resonators within dye-doped electrospun polymeric fiber networks lead to lasing emission [1]. Here, we demonstrate that the narrow laser emission lines can be used as sensor signal. When the fiber networks are exposed to alcohol vapors, the alcohol molecules diffuse into the polymer and cause swelling of the fibers. This swelling process changes the effective refractive index of the fiber resonator and thus causes a spectral shift of the laser mode. In various sensing experiments we analyzed the spectral shift of the lasing modes for different concentrations of ethanol and methanol. For the investigated concentration range we found a linear dependency of the shift on the alcohol concentration. The time resolved signal reveals different saturation times for the different alcohols which are related to the different diffusion constants and allow a differentation of ethanol and methanol.
[1] Krämmer et al., Adv. Mater., 26, 8096-8100, 2014