Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Emerging Topics in Chemical and Polymer Physics, New Instruments and Methods

CPP 14.7: Vortrag

Dienstag, 6. September 2022, 11:00–11:15, H39

Photoluminescence spectroscopy for the detection of microplastics - the Nile Red approach — •Srumika Konde, Stefan Brackmann, Marina Gerhard, and Martin Koch — Department of Physics and Material Sciences Center, Philipps-University of Marburg, Germany

For the detection and classification of microplastics, most researchers commonly use FTIR or Raman spectroscopy. These state-of-the-art methods are, however, laborious, cost-intensive, and time-consuming. To establish a less arduous and inexpensive approach, we propose photoluminescence-based multispectral imaging. Based on the parallel research in our workgroup, we have found that the autofluorescence of plastics lies predominantly in the UV region. To accommodate the identification in the visible region we use a solvatochromic dye called Nile Red. PLE/PL spectra of stained plastics and stained natural materials have been analyzed to determine the right excitation and emission windows for building an imaging system. This analysis has been performed using LDA (linear discriminant analysis). Based on our analysis we propose a system consisting of a blue excitation LED, an RGB camera, and two bandpass filters which would yield about 98% accuracy in isolating plastics from natural materials.