Figure 8

UV–Vis absorption spectral changes of Procion MX-5B dye mixed with WO₃samples at different timings.a Rectangular slab WO₃+ Procion dye,b nanowire clusters WO₃ + Procion dye, andc rod-like WO₃ + Procion dye. Absorption spectra (a,b, andc), respectively, correspond to pure Procion MX-5B dye, Procion MX-5B dye in the dark for 24 h, and Procion MX-5B dye kept under UV illumination for 24 h, in the absence of WO₃nanostructure. Spectra (d–h) corresponds to UV illumination time; 3, 6, 9, 12, and 24 h in the presence of WO₃nanostructures