Figure 1.

Absorption spectra of surface modified 45 Å TiO2 nanoparticles (0.09 M, pH 2) with different ligands (2.5 mM): (A) bare TiO2; (B) catechol; (C) gallic acid; and (D) pyrogallol. Molecular structures of ligands are shown in Table 1

Janković et al. Nanoscale Research Letters 2009 5:81-88   doi:10.1007/s11671-009-9447-y