One-dimensional Anodic TiO2 Nanotubes Coated by Atomic Layer Deposition: Towards Advanced Applications

•Atomic layer deposition (ALD) allows to uniformly coat surfaces by various materials.•Coating of high aspect ratio porous nanostructures is very attractive for applications.•The use of ALD for functionalization of anodic TiO2 nanotube (TNT) layers is reviewed.•Properties of TNT layers are strongly enhanced by coatings of various compositions.•Many different applications of the composite structures are presented and discussed.