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Scanning electron microscopy (SEM) images (magnification: 80×) (a) coupled with energy dispersive X-ray analysis for mapping of S (b) and Na (c) elements in the DAC/PVA ESNW matrices. Energy spectra (d) were recorded for the analysis areas and are indicated as dashed boxes in (a). Spec_1 and Spec_2 correspond to ESNWs spun from 0 wt% and 1 wt% NaHSO3, respectively.
