Semiconductor|melanin interfaces have received increasingly more attention in the fields of photocatalysis and applied electrochemistry because their facile synthesis, unique electrical properties, strong capability toward photosensitization. In this work, we describe electropolymerization quinone-rich polydopamine (PDA) on surface hydrogenated TiO2 nanotubes with enhanced photoactivity visible...

Several paired, localized gap states were observed in semiconducting single-wall carbon nanotubes using spatially resolved scanning tunneling spectroscopy. A pair of gap states is found far from the band edges, forming deep levels, while the other pair is located near the band edges, forming shallow levels. With the help of a first-principles study, the former is explained by a vacancy-adatom c...