Facile synthesis of monodispersed Au nanoparticles-coated on Stöber silica
Facile synthesis of monodispersed Au nanoparticles-coated on Stöber silica
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DOI：
10.1016/j.colsurfa.2013.02.056
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
Jingjie Luo;W. Chu;S. Sall;C. Petit
中科院分区：
文献类型：
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作者：
Jingjie Luo;W. Chu;S. Sall;C. Petit
采用均匀且微小的胶体金纳米颗粒（2-4nm）作为前体，并通过简单的方法涂覆在无孔 Stöber 二氧化硅上。首次在不使用有机硅烷或硫醇化合物的情况下完成包覆过程，这限制了金材料在催化领域的应用。为了更好地理解，进一步分析了合成过程的机理。在涂覆过程中，被羟基物质包围的聚乙烯醇（PVA）保护的金纳米粒子在Stöber二氧化硅的表面上更加分散。接下来的煅烧促进了 PVA 和二氧化硅结构中羟基物质的联合去除，以及由 Stöber 二氧化硅表面上残留羟基物质锚定的金纳米颗粒。即使在煅烧后，大部分约3nm的小颗粒仍保持其尺寸，这恰好满足一些反应（例如CO氧化）的尺寸。这种简单且环保的合成方法为合成尺寸非常小且有序的金催化剂提供了一种可行的策略，可用于催化领域的进一步研究。
The homogeneous and tiny colloidal gold nanoparticles (2–4nm) were utilized as the precursor and coated onto the non-porous Stöber silica by a facile method. For the first time, the coating process is fulfilled without either organosilanes or thiols compounds, which was invariably applied for Stöber silica to fix the gold particles and thus limited the application of the gold material in catalysis field. For better understanding, the mechanism of the synthesis process was further analyzed. During the coating process, the gold nanoparticles protected by polyvinyl alcohol (PVA) surrounded with hydroxyl species were higher dispersed on the surface of Stöber silica. The following calcination facilitated the combining removal of hydroxyl species in both PVA and silica structure, and the gold nanoparticles anchored by residual hydroxyl species on the surface of Stöber silica. Major of the small particles about 3nm remained their sizes even after calcination, which was just the satisfied size for some reactions such as CO oxidation. This simple and environmental synthesis method provided an available strategy for synthesizing gold catalysts with very small and orderly sizes that can be used for further investigation in the catalysis field.