title: Linking Semiconductor Nanocrystals into Gel Networks through All-Inorganic Bridges.
abstract: 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.
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).
authors.forename: Amita
authors.initials: A
authors.lastname: Singh
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).
authors.forename: Beth A
authors.initials: BA
authors.lastname: Lindquist
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).|Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720 (USA).
authors.forename: Gary K
authors.initials: GK
authors.lastname: Ong
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).
authors.forename: Ryan B
authors.initials: RB
authors.lastname: Jadrich
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).
authors.forename: Ajay
authors.initials: A
authors.lastname: Singh
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).
authors.forename: Heonjoo
authors.initials: H
authors.lastname: Ha
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA).
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Ellison
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA). truskett@che.utexas.edu.
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Truskett
authors.affiliation: McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA). milliron@che.utexas.edu.
authors.forename: Delia J
authors.initials: DJ
authors.lastname: Milliron
keywords: bridging ligands; colloids; gels; phase behavior; semiconductor nanocrystals