On the visible-light photoelectrochemical activity of double-walled TiO2 nanotubes obtained by anodization in ionic liquids - Wender, Heberton; Gonçalves, Renato Vitalino; Feil, Adriano; Migowski, Pedro; Dupont, Jairton; Teixeira, Sérgio (Materials Research Society Fall Meeting and Exhibit, 2018)