Titanium nitride/nitrogen-doped titanium oxide (TiN/N-doped TiO 2) composite films were synthesized for visible light photodegradation applications. Thin films of TiN were sputter-deposited on precleaned glass substrates in an admixture of argon and nitrogen gases. The grown TiN films were subsequently oxidized in air at 350 °C at 15, 30, and 60 min. Raman spectral analysis revealed the formation of TiO 2 with anatase structure at 15 min and transitioned to the rutile structure at longer oxidation times. X-ray photoelectron spectral analysis revealed the formation of N-doped TiO 2 from the oxidized Ti. Visible light-induced photodegradation of methylene blue as test analyte showed 30% removal efficiency after exposure to visible light after 2.5 h. The highest degradation efficiency was observed when the anatase phase of TiO 2 is the dominant phase in the film. Moreover, N-doping realized the visible light sensitivity of TiO 2. This makes the composite film ideal for solar light-driven photodegradation of organic contaminants in wastewater.

中文翻译：

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可见光活性光催化剂 TiN/N 掺杂 TiO2 复合薄膜的合成

氮化钛/氮掺杂的氧化钛（TiN/N掺杂的TiO 2 ）复合膜被合成用于可见光光降解应用。在氩气和氮气的混合物中，将 TiN 薄膜溅射沉积在预清洁的玻璃基板上。随后将生长的 TiN 薄膜在 350°C 的空气中氧化 15、30 和 60 分钟。拉曼光谱分析揭示了在 15 分钟时形成锐钛矿结构的 TiO 2 并在更长的氧化时间转变为金红石结构。X 射线光电子能谱分析揭示了由氧化的 Ti 形成 N 掺杂的 TiO 2 。作为测试分析物的亚甲基蓝的可见光诱导光降解在暴露于可见光 2.5 小时后显示 30% 的去除效率。当TiO 2 的锐钛矿相是薄膜中的主要相时，观察到最高的降解效率。此外，N 掺杂实现了 TiO 2 的可见光敏感性。这使得复合膜非常适合太阳能光驱动的废水中有机污染物的光降解。