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首页> 外文会议>Solar hydrogen and nanotechnology VI >One-dimensional plasmonic nano-photocatalysts: Synthesis,characterization and photocatalytic activity
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One-dimensional plasmonic nano-photocatalysts: Synthesis,characterization and photocatalytic activity

机译：一维等离激元纳米光催化剂的合成，表征与光催化活性

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This study describes a simple two-step approach to coat gold nanorods with a silica/titania shell. Gold nanorods with an aspect ratio of 2.5 (L=48±2 and d=19±1) are synthesized by a silver-seed mediated growth approach according to our previously reported procedure (Hunyadi Murph ACS Symposium Series, Volume 1064, Chapter 8, 2011, 127-163 and reference herein). Gold nanorods are grown on pre-formed gold nano-seeds in the presence of surfactant, cetyltrimethylammonium bromide (CTAB), and a small amount of silver ions. A bifunctional linker molecule which has a thiol group at one end and a silane group at the other is used to derivatize gold nanorods. The silane group is subsequently reacted with both sodium silicate and titanium isopropoxide to a silica/titania shell around the gold nanorods. By fine tuning the reaction conditions, the silica/titania shell thickness can be controlled from ～5 to ～40nm. The resulting nanomaterials are stable, amenable to scale up and can be isolated without core aggregation or decomposition. These new materials have been characterized by scanning electron microscopy, energy dispersive X-ray analysis, UV-Vis spectroscopy and dynamic light scattering analysis. Photocatalytic activity of Au-silica/titania nanomaterials under visible and UV illumination is measured via degradation of a model dye, methyl orange (MO) under visible and UV illumination. The results indicate a 3 fold improvement in the photocatalytic decomposition rate of MO under visible illumination vs. UV illumination.
机译：这项研究描述了一种简单的两步法，用二氧化硅/二氧化钛壳包被金纳米棒。根据我们先前报道的程序（Hunyadi Murph ACS Symposium Series，第1064卷，第8章），通过银种子介导的生长方法合成了长宽比为2.5（L = 48±2和d = 19±1）的金纳米棒。 2011，127-163和此处引用）。在表面活性剂，十六烷基三甲基溴化铵（CTAB）和少量银离子存在下，金纳米棒在预先形成的金纳米种子上生长。使用在一端具有巯基且在另一端具有硅烷基的双功能连接分子来衍生金纳米棒。硅烷基团随后与硅酸钠和异丙醇钛反应成金纳米棒周围的二氧化硅/二氧化钛壳。通过微调反应条件，可以将二氧化硅/二氧化钛壳厚度控制在约5至约40nm。所得到的纳米材料是稳定的，适合放大的并且可以被分离而没有核的聚集或分解。这些新材料的特征在于扫描电子显微镜，能量色散X射线分析，UV-Vis光谱和动态光散射分析。通过在可见光和紫外光下降解模型染料甲基橙（MO）来测量Au-二氧化硅/二氧化钛纳米材料在可见光和紫外光下的光催化活性。结果表明，在可见光照射下，相对于紫外线照射，MO的光催化分解速率提高了3倍。

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