Fig. 1From: A Review on the Electrochemically Self-organized Titania Nanotube Arrays: Synthesis, Modifications, and Biomedical ApplicationsResearch trend. The number of papers broken down per year related to TiO2 nanotubes differentiated by different synthesis methods from 2002 to 2017. (Data were collected from Science Citation Index Expanded using titania nanotubes, and anodization or hydrothermal methods or template-based methods as keywords)Back to article page