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首页> 外文期刊>RSC Advances >Hierarchical growth of ZnO nanorods over SnO2 seed layer: insights into electronic properties from photocatalytic activity
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Hierarchical growth of ZnO nanorods over SnO2 seed layer: insights into electronic properties from photocatalytic activity

机译：SnO2种子层ZnO纳米棒的分层生长：从光催化活动中的电子性质见解

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摘要

The use of nanostructured heterojunctions has been a promising option for hindering the charge recombination and thus enhancing the photocatalytic performance of catalysts. Here we present a simple strategy to hierarchically grow heterostructures using a hydrothermal treatment route. A buffer SnO2 film was produced by a sol-gel derived method, resulting in a film of approximately 100 nm composed of 5-10 nm nanoparticles. X-ray diffraction and scanning electron microscopy revealed preferential growth of the nanorod-like structures along the c-axis perpendicular to the SnO2 film, with an average nanorod diameter and length of approximately 160 nm and 1.5 mu m, respectively. The photoluminescence spectra of ZnO-SnO2 revealed a reduction in UV emission compared to individual ZnO nanorods, indicating that the recombination of the photogenerated carriers was inhibited in the heterojunction. This behavior was confirmed by evaluating the photocatalytic performance of such films against methylene blue degradation, showing that the as-prepared ZnO-SnO2 heterojunction was superior to the individual semiconductors, ZnO and SnO2.
机译：使用纳米结构的异质结局部是妨碍电荷重组的有希望的选择，从而提高催化剂的光催化性能。在这里，我们展示了一种使用水热处理路线的分层生长异质结构的简单策略。通过溶胶 - 凝胶衍生方法制备缓冲器SnO2薄膜，导致薄膜由5-10nm纳米颗粒组成约100nm。 X射线衍射和扫描电子显微镜显示沿着垂直于SnO2膜的C轴的纳米棒状结构的优先生长，平均纳米棒直径分别为约160nm和1.5μm。与单独的ZnO纳米棒相比，ZnO-SnO2的光致发光光谱显示UV排放的降低，表明在异质结中抑制了光致携带者的重组。通过评估这种薄膜对亚甲基蓝色降解的光催化性能来证实该行为，表明，制备的ZnO-SnO2异质结优于各个半导体，ZnO和SnO2。

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  • 来源
    《RSC Advances》 |2016年第3期|共7页
  • 作者

    Da Silva Luis F.; Lopes Osmando F.; Catto Ariadne C.; Avansi Waldir Jr.; Bernardi Maria I. B.; Li Maximo Siu; Ribeiro Caue; Longo Elson;

  • 作者单位

    Univ Estadual Paulista Inst Quim LIEC BR-14800900 Araraquara SP Brazil;

    EMBRAPA Instrumentacao BR-13560970 Sao Carlos SP Brazil;

    Univ Sao Paulo Inst Fis Sao Carlos BR-13566590 Sao Carlos SP Brazil;

    Univ Fed Sao Carlos Inst Fis BR-13565905 Sao Carlos SP Brazil;

    Univ Sao Paulo Inst Fis Sao Carlos BR-13566590 Sao Carlos SP Brazil;

    Univ Sao Paulo Inst Fis Sao Carlos BR-13566590 Sao Carlos SP Brazil;

    EMBRAPA Instrumentacao BR-13560970 Sao Carlos SP Brazil;

    Univ Estadual Paulista Inst Quim LIEC BR-14800900 Araraquara SP Brazil;

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  • 正文语种 eng
  • 中图分类 化学;
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