Fig. 8

Left panel: Analysis points investigated through Raman microscopy (highlighted as black circles over the colour picture of the sample). Right panel: Raman spectra of the samples G3. Layer 3 shows the presence of Anatase (147(vs), 198(vw), 396, 515, 640 cm−1). Layer 5 is composed by Zinc Oxide (332(w), 383(w) 438(s) cm−1), whereas Layer 4 is made of Lead Chromate (354(s), 375(m), 397(w), 839(vs) cm−1)