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An aqueous-based metal ion crosslinking approach for assembly of metal chalcogenide nanoparticles (NPs) into robust gels is reported. Short chalcogenide ligands (S 2− ) undergo crosslinking with metal salts (Sn 4+ ) to form a gel [NP/S 2− /Sn 4+ ] 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 Sn 4+  leads to ion exchange and formation of an amorphous “SnTe” gel.

Application of Aqueous-Based Covalent Crosslinking Strategies to the Formation of Metal Chalcogenide Gels and Aerogels