<br>在 4A 沸石上获得的 Pb/Pb3O4 金属-半导体纳米复合材料─光学和结构性能,ACS Omega

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在 4A 沸石上获得的 Pb/Pb3O4 金属-半导体纳米复合材料─光学和结构性能
ACS Omega ( IF 3.7 ) Pub Date : 2024-02-09 , DOI: 10.1021/acsomega.3c07247
Ricardo Britto-Hurtado ₁ , Eduardo Larios-Rodriguez ₂ , Rafael Ramírez-Bon ₃ , Luis Patricio Ramírez Rodríguez ₄ , Temístocles Mendívil Reynoso ₄ , Mario Flores Acosta ₅ , M Cortez-Valadez ₁

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这项工作描述了一种使用合成沸石 4A 获得 Pb/Pb ₃ O ₄纳米复合材料的受控且低成本的合成方法。获得的纳米结构具有直径为 5-25 nm 的核壳结构。高分辨率透射电子显微镜（HRTEM）、BF、高角度环形暗场环形扫描透射电子显微镜（HAADF-STEM）、能量色散X射线能谱（EDS）、X射线光电子能谱（XPS）、并使用了紫外可见（UV-vis）表征技术。使用 HRTEM 确定核的晶面 (111)、(200) 和 (220) 以及壳的晶面 (110) 和 (211)，分别对应于 Pb 和 Pb ₃ O ₄的 FCC 和四方结构。 HAADF-STEM 图像允许分析与原子数量成比例的强度对比图像。 XPS 光谱分析显示铅和氧化铅的 Pb 4f _7/2和 Pb 4f _5/2之间的结合能差异为 4.8 eV。 EDS 元素图、XPS 和紫外可见光谱分析表明，同一结构中同时存在铅和氧化铅。获得的壳带隙确定为 4.50 eV。因此，Pb/Pb ₃ O ₄纳米复合材料对高能光子表现出更高的响应，使其适合紫外光催化应用。

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Pb/Pb3O4 Metal–Semiconductor Nanocomposite Obtained on 4A Zeolite─Optical and Structural Properties

This work describes a controlled and low-cost synthesis method to obtain Pb/Pb₃O₄ nanocomposites using synthetic zeolite 4A. The nanostructures obtained have a core–shell configuration with 5–25 nm diameters. High-resolution transmission electron microscopy (HRTEM), BF, high-angle annular dark-field annular scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and ultraviolet–visible (UV–vis) characterization techniques were used. Crystallographic planes (111), (200), and (220) for the core and planes (110) and (211) for the shell, corresponding to FCC and tetragonal structures for Pb and Pb₃O₄, respectively, were determined using HRTEM. The HAADF-STEM images allowed the analysis of intensity contrast images proportional to the number of atoms. XPS spectral analysis showed a 4.8 eV difference in binding energy between Pb 4f_7/2 and Pb 4f_5/2 for lead and lead oxide. EDS elemental mapping, XPS, and UV–vis spectroscopy analyses revealed the simultaneous presence of lead and lead oxide in the same structure. The band gap obtained for the shell was determined to be 4.50 eV. Consequently, Pb/Pb₃O₄ nanocomposites show a higher response to high-energy photons, making them suitable for UV photocatalysis applications.

更新日期：2024-02-09

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