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. 2022 Aug 3;14(32):37051–37058. doi: 10.1021/acsami.2c09467

Figure 4.

Figure 4

Film-shaped polymeric sensor’s (POLYSEN) chemical structures in the different stages of the detection process: (A) starting material, (B) nitrosyl cation formation inside the film, (C) benzenediazonium salt formation, and (D) azo compound formation. *The formation of the azo compound is also possible in the p-OH position, but only the o-OH substitution is shown for clarity.