Decoupling a Thin Well-Ordered TiO2(110) Layer from a TiO2(110) Substrate with a Ti + Ta Mixed Oxide Interlayer

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• 作者：Xin Song ; Elena Primorac ; Helmut Kuhlenbeck ; Hans-Joachim Freund
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 21, 2016
• 年：2016
• 卷：120
• 期：15
• 页码：8185-8190
• 全文大小：324K
• 年卷期：0
• ISSN：1932-7455

文摘

A well-ordered TiO₂(110) thin film has been successfully prepared on a rutile TiO₂(110) single crystal substrate with a Ti + Ta mixed oxide interlayer. LEED and STM experiments show that the surface structure of the TiO₂ thin film is the same as that of a regular TiO₂(110) single crystal sample, and methanol TPD studies indicate that the chemical activities of the surfaces are also essentially identical. The Ti + Ta oxide interlayer hinders Ti diffusion, and therefore the TiO₂ film can quickly be reduced and oxidized due to the small layer volume without changing the state of the substrate notably. This permits to study fully oxidized defect-free electrically insulating TiO₂(110) surfaces with methods employing charged particles without surface charging. Also, strongly reduced layers can be prepared without substrate reduction.