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Linking Semiconductor Nanocrystals into Gel Networks through All‐Inorganic Bridges
Author(s) -
Singh Amita,
Lindquist Beth A.,
Ong Gary K.,
Jadrich Ryan B.,
Singh Ajay,
Ha Heonjoo,
Ellison Christopher J.,
Truskett Thomas M.,
Milliron Delia J.
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201508641
Subject(s) - nanocrystal , colloid , cluster (spacecraft) , nanotechnology , polymer , semiconductor , phase (matter) , materials science , self assembly , chemical engineering , particle (ecology) , nanoscopic scale , chemistry , organic chemistry , optoelectronics , oceanography , geology , computer science , engineering , composite material , programming language
For colloidal semiconductor nanocrystals (NCs), replacement of insulating organic capping ligands with chemically diverse inorganic clusters enables the development of functional solids in which adjacent NCs are strongly coupled. Yet controlled assembly methods are lacking to direct the arrangement of charged, inorganic cluster‐capped NCs into open networks. Herein, we introduce coordination bonds between the clusters capping the NCs thus linking the NCs into highly open gel networks. As linking cations (Pt 2+ ) are added to dilute (under 1 vol %) chalcogenidometallate‐capped CdSe NC dispersions, the NCs first form clusters, then gels with viscoelastic properties. The phase behavior of the gels for variable [Pt 2+ ] suggests they may represent nanoscale analogues of bridged particle gels, which have been observed to form in certain polymer colloidal suspensions.