*2.4. Deposition of Ag/TiO2 onto Plasma-Activated Viscose*

As demonstrated in Figure 1, the plasma tool was applied to viscose fibers for 3 min at a power of 400 W and a constant pressure of 3 × <sup>10</sup>−<sup>3</sup> mbar [27]. The above-prepared solutions were then applied to the plasma-activated viscose fibers by the pad–dry–cure process. Both TiO2 NPs (0.1 g) and Ag0/TiO2 (0.1 g) were stirred in DW (150 mL) and homogenized for 45 min under ambient conditions. The plasma-activated fabric (15 cm × 15 cm) was soaked in the prepared solutions for 60 min, and subjected to pad–dry–cure. The viscose was then dried at 90 ◦C, subjected to curing at 120 ◦C, and finally rinsed with DW. The binding stability of Ag0/TiO2 and TiO2 onto viscose can be attributed to the electrostatic forces among Ti4+ existing on TiO2 or Ag0/TiO2, and the negative charges on the viscose surface. The negative charges on viscose could be attributed to the negatively charged substituents, such as O–O– and –COO– generated by plasma.

**Figure 1.** Schematic diagram representing the deposition of Ag0/TiO2 onto plasma-cured viscose fabric.

#### *2.5. Characterization Methods*

TEM (JEOL-1230, Akishima, Japan) was applied to inspect the morphology of the prepared TiO2 NPs. The morphologies of the coated viscose were explored by Quanta SEM FEG 250 (Brno-Cernovice, Czech Republic) linked to EDS (TEAM) to investigate ˇ the elemental contents of the viscose coated surface. FT-IR spectra were assessed by Nexus 670 (Nicolet; Watertown, MA, USA). UV/Vis absorption spectra and CIE Lab of the coated viscose were collected by UltraScanPro (Hunter Lab, Reston, VA, USA). The optical band gap was assessed from the absorbance spectrum utilizing Tauc's equation [ε*hν* =C(*hν*−Eg) n], where Eg is the average band gap, ε is molar extinction coefficient, C is a constant, and n relies on the transition type.

#### *2.6. Evaluation of Self-Cleaning*

The self-cleaning activity was assessed by the light-induced decay of methylthioninium chloride (MTC) under visible (410 nm) and ultraviolet irradiation (315–380 nm) according to previous literature procedures [28].
