Figure 8.

UV–Vis absorption spectral changes of Procion MX-5B dye mixed with WO3samples at different timings.aRectangular slab WO3+ Procion dye,bnanowire clusters WO3 + Procion dye, andcrod-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 (dh) corresponds to UV illumination time; 3, 6, 9, 12, and 24 h in the presence of WO3nanostructures

Rajagopal et al. Nanoscale Research Letters 2009 4:1335-1342   doi:10.1007/s11671-009-9402-y