The insulating organic ligands used in colloidal synthetic routes preclude efficient electrical transport in assemblies, limiting potential application in solid state devices. Oxidative assembly routes have the benefit of eliminating intervening ligands, but the resulting architectures are subject to dispersion by chemical reductants. An alternative approach is to replace the organic ligands with chalcogenides, and then cross-link the chalcogenides with metal ions. However, the reactivity of the ligands (chalcogenides) and crosslinking ions can lead to ion-exchange, producing new compositions of nanoparticles or aerogels. In this presentation, the shape-dependent reactivity of PbTe nanocrystals to sulfide ligands will be presented, along with metal-ion crosslinking strategies. Access of new chalcogenide aerogel compositions by ion-exchange of cross-linked aerogels will also be described and discussed in the context of developing a chemical tool-box for rational targeting of desired compositions with robust interfaces.

New chalcogenide aerogel compositions from covalent crosslinking + ion-exchange

255th National Meeting (2018)

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