Manufacture of Mesoporous Silicon from Living Plants and Agricultural Waste: An Environmentally Friendly and Scalable Process
Manufacture of Mesoporous Silicon from Living Plants and Agricultural Waste: An Environmentally Friendly and Scalable Process
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DOI：
10.1007/s12633-012-9129-8
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发表时间：
2012-10-01
期刊：
影响因子：
3.4
通讯作者：
Coffer, J. L.
中科院分区：
文献类型：
--
作者：
Batchelor, L.;Loni, A.;Coffer, J. L.
我们展示了一种从一系列陆地植物如常见的草，竹，甘蔗和水稻中实现介孔硅的过程。这些植物就像“天然工厂”，将土壤中大量的可溶性硅转化和浓缩成纳米结构形式的二氧化硅，存在于它们的根、茎、枝或叶中。这种多孔生物二氧化硅被化学提取，然后使用镁蒸气热还原为多孔硅。重要的是，对于较大的批量，加入廉价的热缓和剂如作为盐，以控制反应速率并使烧结最小化。例如，已经从竹子提取物获得了具有8 nm宽孔的> 350 m2/g的中孔硅。同样的过程适用于各种各样的“硅蓄电池厂”。这种“天然衍生的”多孔硅的纯度很可能被提高到电子和太阳能电池技术之外的广泛的大批量应用可接受的水平。
We demonstrate a process for realising mesoporous silicon from a range of land-based plants such as common grasses, bamboos, sugarcane and rice. Such plants act as "natural factories", converting and concentrating vast quantities of soluble silicon in soil into nanostructured forms of silica in their roots, stems, branches or leaves. This porous biogenic silica is chemically extracted and then thermally reduced to porous silicon using magnesium vapor. Importantly, for larger batch size, an inexpensive thermal moderator such as salt, is added for control of the reaction exotherm and minimization of sintering. Mesoporous silicon of > 350 m(2)/g with 8 nm wide pores has been obtained from a bamboo extract, for example. The same process is applicable to a wide range of "silicon accumulator plants". The purity of this "naturally derived" porous silicon is likely to be raised to a level acceptable for a wide range of high volume applications outside of electronics and solar cell technology.