As shown in the figure, graphene-based crystalline anatase TiO2 nanocomposites have been formed in a precise and well controlled manner by the group. The synthesized graphene displays a porous structure with very thin wrinkles. After several tens of ALD-cycles, TiO2 nanoparticles of around 5 nm were uniformly deposited on both sides of the host material. Further ALD-cycles led to the formation of homogenous films.

Additionally, the team reported that the as-synthesized TiO2–graphene nanocomposites could be tuned in morphology as well as structure. A lower temperature (150 °C) contributed to amorphous TiO2 while a higher temperature (250 °C) produced crystalline anatase TiO2. Thus, ALD as a deposition technique offers an elegant way of fine-tuning the synthesis of graphene-based nanocomposites.

Further details can be found in the journal Nanotechnology.