1：Experimental Design and Method Selection:

A two-step hydrolysis method was used to deposit titanium dioxide on PET ion-track membranes, involving precipitation from titanium tetrachloride solutions and peptization with acids. The design rationale was to create nanostructured coatings for photocatalytic applications.

2：Sample Selection and Data Sources:

PET films (Hostaphan? type) were irradiated with Kr ions, etched, and modified with TiO2 hydrosols at concentrations of 0.5 wt%, 1 wt%, and 3 wt%. Samples were characterized using SEM, AFM, XRD, and UV-vis spectroscopy.

3：5 wt%, 1 wt%, and 3 wt%. Samples were characterized using SEM, AFM, XRD, and UV-vis spectroscopy. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included a cyclotron DC-60 for irradiation, UV lamp for sensitization, SEM (JEOL-7500F and Hitachi TM3030), AFM (NT-206), XRD (D8 ADVANCE ECO), and UV-vis spectrometer (Specord-250 BU). Materials included PET films, titanium tetrachloride, nitric acid, hydrochloric acid, isopropyl alcohol, NaOH, acetone, and distilled water.

4：Experimental Procedures and Operational Workflow:

PET films were irradiated, sensitized with UV, etched in NaOH, washed, and dried. TiO2 hydrosols were prepared by hydrolysis and peptization. Membranes were immersed in sols, washed, and heat-treated. Characterization involved SEM, AFM, XRD, and UV-vis measurements.

5：Data Analysis Methods:

Data were analyzed using software BrukerAXSDIFFRAC.EVAv.4.2 for XRD, with phase identification via ICDD PDF-2 database. SEM and AFM images were analyzed for morphology, and UV-vis spectra were recorded for absorption properties.