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Negative TOF-SIMS sputter depth profiles for air-TNTs and H2-TNTs treated with BSA.
Abbreviations: TOF-SIMS, time-of-flight secondary ion mass spectrometry; air-TNTs, air-annealed TiO2 nanotubes; H2-TNTs, hydrogenated TiO2 nanotubes; BSA, bovine serum albumin.
