Molybdenum oxides have attracted much interest due to their unique electronic properties. Here, we report a convenient and efficient method to synthesize centimeter-scale single crystal of MoO₃ ribbons through an atmospheric pressure physical vapor deposition approach. Optical microscopy, atomic force microscopy, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction, and x-ray diffraction measurements reveal that the MoO₃ ribbons grow along the MoO₃⟨100⟩ direction and the top surface is MoO₃(010) plane. Raman spectroscopy, x-ray photoelectron spectroscopy, and cross-sectional HRTEM results disclose that the surface of MoO₃ ribbons can be transformed from MoO₃ to MoO₂ through H₂ annealing treatment forming MoO₂/MoO₃ heterostructure. We found that the conductance and ultraviolet photoresponsivity of the MoO₃ ribbons can be improved by ∼11 and ∼5 orders of magnitude, respectively, after H₂ annealing treatment, which will be helpful for the applications of MoO₃ in the optoelectronic field.

中文翻译：

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用于高性能紫外光电探测器的厘米级单晶 MoO3 带的生长

钼氧化物由于其独特的电子特性而引起了人们的极大兴趣。在这里，我们报告了一种通过大气压物理气相沉积方法合成厘米级 MoO ₃带状单晶的方便有效的方法。光学显微镜、原子力显微镜、高分辨率透射电子显微镜 (HRTEM)、选区电子衍射和 X 射线衍射测量表明，MoO ₃带沿 MoO ₃ ⟨100⟩ 方向生长，顶面为 MoO ₃ (010) 飞机。拉曼光谱、X 射线光电子能谱和横截面 HRTEM 结果表明 MoO ₃带的表面可以从 MoO 转化₃到MoO ₂通过H ₂退火处理形成MoO ₂ /MoO ₃异质结构。我们发现，经过H ₂退火处理后，MoO ₃带的电导率和紫外光响应性可以分别提高~11 和~5 个数量级，这将有助于MoO ₃在光电领域的应用。