Application of Aqueous-Based Covalent Crosslinking Strategies to the Formation of Metal Chalcogenide Gels and Aerogels
Application of Aqueous-Based Covalent Crosslinking Strategies to the Formation of Metal Chalcogenide Gels and Aerogels
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DOI：
10.1515/zpch-2018-1171
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发表时间：
2018-08-01
影响因子：
2.5
通讯作者：
Brock, Stephanie L.
中科院分区：
文献类型：
--
作者：
Hewavitharana, Indika K.;Brock, Stephanie L.
报道了一种水基金属离子交联方法将金属硫族化物纳米颗粒组装成坚固的凝胶。短硫族配体（S2-）与金属盐（Sn4+）交联形成凝胶[NP/S2-/Sn4+](n) （NP = PbTe, PbS, CdS, CdSe）。相应的气凝胶网络保留了天然构建块的结晶度和量子约束效应，同时获得了优异的孔隙率[brunauer - emmet - teller （BET）表面积为160-238 m(2)/g]。用过量的Sn4+处理硫化物覆盖的PbTe纳米颗粒会导致离子交换并形成无定形的“SnTe”凝胶。
An aqueous-based metal ion crosslinking approach for assembly of metal chalcogenide nanoparticles (NPs) into robust gels is reported. Short chalcogenide ligands (S2-) undergo crosslinking with metal salts (Sn4+) to form a gel [NP/S2-/Sn4+](n) (NP = PbTe, PbS, CdS, CdSe). The corresponding aerogel networks retain the crystallinity and quantum confinement effects of the native building blocks while achieving excellent porosity [Brunauer-Emmett-Teller (BET) surface areas of 160-238 m(2)/g]. Treatment of sulfide-capped PbTe nanoparticles with an excess of Sn4+ leads to ion exchange and formation of an amorphous "SnTe" gel.