Figure 2From: New Hybrid Properties of TiO2 Nanoparticles Surface Modified With Catecholate Type LigandsAbsorption spectra of 3.5 mM TiO2 nanoparticles before and after surface modification with pyrogallol (0–1.23 mM in 0.06 mM steps). Inset: Absorption at 425 nm of TiO2–pyrogallol CT complex versus pyrogallol concentration (data recorded 20 h after surface modification). Solutions of TiO2 nanoparticles used for modification were freshly prepared (A) and 4-years-old (B)Back to article page