LIBS and LA-SD-OES for the discrimination of technical polymers
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
12th Euro-Mediterranean Symposium on Laser-induced Breakdown Spectroscopy
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
Spark optical emission spectroscopy (spark OES) and Laser-induced breakdown spectroscopy (LIBS) are
advanced element analysis methods that are widely used in the metal industry (spark OES) and in many different
industry branches (LIBS [1]). While spark OES requires samples that are electrically conductive, LIBS can be
employed to nearly all kinds of materials. However, LIBS is suffering from the matrix effect, i.e. the sensitivity and
limits of detection depend on the structure and composition of the sample matrix. We combine electric spark
discharge and laser ablation for the excitation of analytical plasma and optical emission spectroscopy (Laser
Ablation Spark Discharge OES, LA-SD-OES). This combination has been shown to overcome the matrix effect for
high alloyed steel samples [2]. Here, we report on further advancements of the LA-SD-OES method to measure also
non-conductive samples. A low-to-mid energy laser pulse is applied to the sample inducing a faint plasma that
triggers an electric spark discharge between two electrodes. The optical emission of the laser-induced/spark
plasma is measured (Fig. 1).Different technical polymers (PA6, PC, PE-HD, PET, PMMA, POM, PP, PS, PTFE, PVC, UHMWPE, etc.) are
measured by LIBS and LA-SD-OES aiming to distinguish the materials by distinct spectral features. Molecular
emission bands of CN and C2 as well as atomic lines of O, N, H, and of some specific elements are measured and
the correlation of intensities is used for materials discrimination. For polymers containing halogens LA-SD-OES
outperforms LIBS. Measurements for flame retardant and UV-resistant additives are ongoing. The damage of the
polymer sample surfaces stays minimal as the electric spark discharge does not contribute to the ablation process.
Sprache der Kurzfassung:
Englisch
Vortragstyp:
Hauptvortrag / Eingeladener Vortrag auf einer Tagung
Forschungs-