Figure 8. (A) Fluorescent intensity change of P1 with various metal ions. Insert: linear relationship between ΔI/I 0 and the Fe3+. Reproduced with permission: Copyright 2019, American Chemical Society.[43] (B) Emission spectra of HBPSi with different Fe3+ concentrations. Reproduced with permission: Copyright 2023, American Chemical Society.[47] (C) Color and fluorescent intensity change of HBPSi with Co2+. Reproduced with permission: Copyright 2022, American Chemical Society.[42] (D) Fabrication of BpaP and BpaD sensors and detection for 4-nitrophenol. Reproduced with permission: Copyright 2020, Elsevier.[61] (E) Photographs of the PMDF film and its sensing process for Fe3+. Reproduced with permission: Copyright 2021, Elsevier.[60] (F) Schematic illustration of the sensing mechanism of TPB-P towards nitroaromatic compounds. Right: TEM images of the TPB-P nanoparticles. Reproduced with permission: Copyright 2021, The Royal Society of Chemistry.[54] (G) Schematic illustration of the sensing mechanism of FMPS towards picric acid. Reproduced with permission: Copyright 2019, The Royal Society of Chemistry.[57]