在各种金红石 TiO2 表面上调制单层 MoS2 的光致发光：对光催化应用的启示,ACS Applied Nano Materials

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在各种金红石 TiO2 表面上调制单层 MoS2 的光致发光：对光催化应用的启示
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-05-10 , DOI: 10.1021/acsanm.2c01754
Miaomiao Xiang ₁ , Chenxi Huang ₁ , Yue Xing ₁ , Huihui Liu ₁ , Xiang Shao ₁

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与氧化物半导体的杂化为定制二维材料 (2DM) 的物理化学性质提供了一种通用策略。然而，特定界面交互的直接影响尚未得到很好的分类，特别是在原子级别上。在目前的工作中，通过化学气相沉积 (CVD) 方法，我们成功地在具有 (100)、(110) 和 (001) 末端的原子级光滑金红石 TiO ₂单晶上生长了单层 MoS _2薄片。我们发现，只有通过微调生长参数才能在所有 TiO ₂基板上制造可比的高质量 MoS _{2 。}此外，MoS _{2的光致发光}也随着衬底终端的变化而变化，显示出按照 (100) > (110) > (001) 的顺序逐渐降低的 A ⁰ / A ^{-激子比。}详细的 X 射线光电子能谱测量显示 MoS ₂ /TiO ₂样品中 Ti 和 O 的结合能变化趋势相同，这归因于在 MoS ₂ /TiO _{2处建立的不同偶极场}接口。我们的工作不仅强化了界面电荷再分布在定制杂化体系性能中的重要作用，而且强调了刻面效应可以作为优化组合体系光催化活性的有效策略。

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Modulated Photoluminescence of Single-Layer MoS2 on Various Rutile TiO2 Surfaces: Implications for Photocatalytic Applications

Hybridization with oxide semiconductors provides a versatile strategy for tailoring physicochemical properties of two-dimensional materials (2DMs). However, the direct impacts of specific interface interactions have not yet been very well categorized, in particular at an atomic level. In the present work, through a chemical vapor deposition (CVD) method, we successfully grew monolayer MoS₂ flakes on an atomically smooth rutile TiO₂ single crystal with (100), (110), and (001) terminations. We found that the fabrication of comparable high-quality MoS₂ on all of the TiO₂ substrates can only be achieved via finely varying the growth parameters. Moreover, the photoluminescence of MoS₂ also changes against the substrate terminations, showing a gradually reduced A⁰/A^– exciton ratio following the sequence of (100) > (110) > (001). Detailed X-ray photoelectron spectroscopy measurements showed the same tendency for the binding energy shifts of both Ti and O in the MoS₂/TiO₂ samples, which were attributed to the varied dipole fields established at the MoS₂/TiO₂ interfaces. Our work not only reinforces the important role of interface charge redistribution in tailoring the properties of hybridized systems but also emphasizes that the facet effect may be applied as an efficient strategy for optimizing the photocatalytic activities of compositional systems.

更新日期：2022-05-10

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