Unprecedented ultra-high hydrogen gas sensitivity in undoped titania nanotubes

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Highly-ordered TiO2 nanotube arrays up to 220 µm in length: use in water photoelectrolysis and dye-sensitized solar cells (2007, background): “length exhibit an unprecedented 50 000 000 000% change in electrical resistivity [4, 5].”
An electrochemical strategy to incorporate nitrogen in nanostructured TiO2 thin films: modification of bandgap and photoelectrochemical properties (2006, background): “Higher anodization potentials were found to result in thicker films, which is desired for enhanced gas sensing [29], solar cell [30] and water photolysis properties [31], but the large anodization currents observed at higher voltages (>1 A cm−2 at 25 V) resulted in excessive anodic oxygen evolution ”
Gas Sensors Based on One Dimensional Nanostructured Metal-Oxides: A Review (2012, methodology): “7 orders of magnitude for 1,000 ppm H2 [79].”