Figure 5. SEM images of nanoporous titanium dioxide layer (anodization time: 45 min) after heating to 350 °C (1: side view; 2: top view)

From

From Titanium Foil to Gas Sensor: Nanoporous Anodic Titania as a Functional Material

Edwin Bogdan, Christoph Weidmann, Thomas Waitz

World Journal of Chemical Education. 2023, 11(3), 54-59 doi:10.12691/wjce-11-3-6