TiO2 Curved Crystal in NanoLetters
Another work using curved crystals has recently been published in Nano Letters by A. Miccio et al.. A curved rutile TiO2(110) crystal, produced by BihurCrystal, was used to investigate the presence and role of oxygen vacancies on the surface for different terrace widths using STM and ARPES.
Rutile is the most stable polymorph of titanium dioxide and is used in fields such as catalysis and memristors. TiO2‘s lattice defects — oxygen vacancies in particular — play an important role in many of its applications, because they turn the otherwise insulating material into an n-type semiconductor.
Thanks to the curved sample approach, the authors are able to explore the changing step edge morphology and the role of oxygen vacancies in vicinal rutile TiO2(110) for different terrace widths.
In the featured image, the curved TiO2 crystal is in its reduced state, which gives it a bluish color. The figure on the right (15nm x 15nm) shows a (110) terrace. Oxygen vacancies appear as bright, short features connecting bright Ti rows.
The paper has been added to BihurCrystal’s portfolio, where a summary can be found. The full paper can be found on the Nano Letters website.