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Summary of the nanotube dimensions under different voltage and pH conditions and their maximum resistance variation to 1,000 ppm H2 at room temperature. The anodization time was 17 h for all samples. Reprinted from [8] with permission. Copyright (2013) IOP Publishing Ltd.
| 10 V (30 nm pore size) | |||
|---|---|---|---|
| Length | Log(S) | Log(S) | |
| pH | (nm) | no Pd | with Pd |
| 1.1 | 350 | 7.2 | 7.3 |
| 3.0 | 730 | 8.0 | 8.7 |
| 4.0 | 990 | 8.7 | 8.3 |
| 4.5 | 1400 | 8.0 | 8.3 |
| 5.0 | 2000 | – | – |
