Porous semiconducting gels and aerogels from chalcogenide clusters
Porous semiconducting gels and aerogels from chalcogenide clusters
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DOI：
10.1126/science.1142535
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发表时间：
2007-07-27
期刊：
影响因子：
56.9
通讯作者：
Kanatzidis, Mercouri G.
中科院分区：
文献类型：
--
作者：
Bag, Santanu;Trikalitis, Pantelis N.;Kanatzidis, Mercouri G.
无机多孔材料正被开发用于分子筛、离子交换剂和催化剂，但大多数是氧化物。我们表明，各种硫化物和硒化物簇，当绑定到金属离子，产生凝胶具有多孔框架。这些凝胶在用二氧化碳超临界干燥后转化为气凝胶。气凝胶具有高的内表面积（高达327平方米/克）和宽的孔径分布，这取决于所使用的前体。这些硫化物和硒化物材料的孔隙优先吸收重金属。这些材料具有窄的能隙（在0.2和2.0电子伏之间）和低密度，并且它们可以用于光电子学，作为光催化剂，或用于从水中去除重金属。
Inorganic porous materials are being developed for use as molecular sieves, ion exchangers, and catalysts, but most are oxides. We show that various sulfide and selenide clusters, when bound to metal ions, yield gels having porous frameworks. These gels are transformed to aerogels after supercritical drying with carbon dioxide. The aerogels have high internal surface area ( up to 327 square meters per gram) and broad pore size distribution, depending on the precursors used. The pores of these sulfide and selenide materials preferentially absorb heavy metals. These materials have narrow energy gaps ( between 0.2 and 2.0 electron volts) and low densities, and they may be useful in optoelectronics, as photocatalysts, or in the removal of heavy metals from water.