Combining MWNTs with TiO2 can efficiently enhance light absorption and charge separation and then photocatalytic activity. This is due to the chemical bonding between the modified MWNTs and TiO2, derived from direct growth of TiO2 nanoparticles on the surface of the MWNTs during the hydrothermal process. Furthermore, the MWNT-TiO2 nanocomposites showed visible-light-driven photocatalytic activity, which is not observed for a simple mixture of MWNTs and TiO2 nanoparticles. This results from the different situation of phase contact between MWNTs and TiO2.

These findings are crucial for synthesis of photocatalysts with high conversion efficiency of solar light to the photocatalytic hydrogen production.

The researchers presented their work in Nanotechnology.