고도로 정렬된 TiO2 나노튜브의 제조와 활용

초록

Titanium dioxide (TiO2) is one of the most intensively investigated materials in materials science. Mostly, TiO2 has been used in the form of nanoparticles, but recently new highly ordered TiO2 nanotubes (U-tube) has been introduced and applied to various applications due to their one-dimensional charge path way. In the present paper, we described the formation process and physical properties of U-tube then, gave examples of applications in sequence. Firstly, in photocatalysis, U-tube was used with Au/Pt co-catalysts and showed enhanced photogenerated H2 efficiency compared to bare TiO2. Secondly, photoelectrochemical performance of U-tube was evaluated with different heat-treatment temperatures. As a further application, two different types of electrical cell (Ti-TiO2-Pt and Ti-TiO2-PtNP) was configurated to observe memristive behavior of U-tube. Both cells behaved as switching electrodes and follow a memristive movement in the high and low resistance state extremely well with high reproducibility.

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