Reversible cation exchange on macroscopic CdSe/CdS and CdS nanorod based gel networks

Over the past decades, cation exchange reactions applied to nanoparticles have opened up synthetic pathways to nanocrystals, which were not accessible by other means before. The limitation of cation exchange on the macroscopic scale of bulk materials is given by the limited ion diffusion within the...

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Bibliographic Details
Published in:Nanoscale 2020-02, Vol.12 (8), p.538-547
Main Authors: Lübkemann, Franziska, Rusch, Pascal, Getschmann, Sven, Schremmer, Björn, Schäfer, Malte, Schulz, Marcel, Hoppe, Bastian, Behrens, Peter, Bigall, Nadja C, Dorfs, Dirk
Format: Article
Language:English
Subjects:
Aerogels
Cadmium selenides
Cadmium sulfide
Cation exchanging
Crystal structure
Destabilization
Ion diffusion
Ions
Nanocrystals
Nanomaterials
Nanoparticles
Nanorods
Porous materials
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Summary:Over the past decades, cation exchange reactions applied to nanoparticles have opened up synthetic pathways to nanocrystals, which were not accessible by other means before. The limitation of cation exchange on the macroscopic scale of bulk materials is given by the limited ion diffusion within the crystal structure. Lyogels or aerogels are macroscopic, highly voluminous, porous materials composed of interconnected nanoscopic building blocks and hence represent a type of bridge between the macroscopic and the nanoscopic world. To demonstrate the feasibility of cation exchange on such macroscopic nanomaterials, the cation exchange on CdSe/CdS core/shell and CdS nanorod based lyogels to Cu 2− x Se/Cu 2− x S and Cu 2− x S and the reversible exchange back to CdSe/CdS and CdS lyogels is presented. These copper-based lyogels can also be used as an intermediate state on the way to other metal chalcogenide-based macroscopic structures. By reversed cation exchange back to cadmium an additional proof is given, that the crystal structures remain unchanged. It is shown that cation exchange reactions can also be transferred to macroscopic objects like aerogels or lyogels. This procedure additionally allows the access of aerogels which cannot be synthesized via direct destabilization of the respective colloidal solutions. Nanoparticle-based lyogels or aerogels represent a type of bridge between the macroscopic and nanoscopic world, while these structures are used to demonstrate the feasibility of cation exchange reactions on such macroscopic nanomaterials.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr09875e