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Fig. 5 | Environmental Sciences Europe

Fig. 5

From: Identification of microplastic fibres released from COVID-19 test swabs with Raman imaging

Fig. 5

Photo image (a), Raman spectrum (b) and images (c–e), SEM image (f), PCA spectrum (g) and images (h–j). The squared area in (a) of 10 μm × 10 μm was scanned. Raman spectra were collected under an objective lens of 100 × , integration time of 1 s for each pixel of 0.33 μm × 0.33 μm (to create a matrix of 30 × 30). In (b), a single spectrum and the average spectrum of the scanning spectrum matrix are presented along with the typical scanning spectra collected from the positions marked in (e). In (b, g), PA’s spectrum is shown as reference. (c) maps a blank wavenumber window as an internal reference image. (d, e) map the PA peak at ~ 2910 cm−1 (d) and the TiO2 peak at ~ 640 cm.−1 (e), respectively. (f) merges the SEM image with the PCA image (j). (g) is PCA spectra. (h–j) map PC1–PC3, individually. In (i), PC2’ loading coefficient is subject to reverse. The squared area in (j) is further checked in Fig. 6

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