Facet to Facet Linking of Shape Anisotropic Inorganic Nanocrystals with Site Specific and Stoichiometric Control

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Facet to Facet Linking of Shape Anisotropic Inorganic Nanocrystals with Site Specific and Stoichiometric Control
Title:
Facet to Facet Linking of Shape Anisotropic Inorganic Nanocrystals with Site Specific and Stoichiometric Control
Journal Title:
Nano Letters
Keywords:
Publication Date:
08 September 2016
Citation:
Nano Lett. 2016, 16, 10, 6431-6436
Abstract:
Nonclassical growth mechanisms such as selfassembly and oriented attachment are effective ways to build complex nanostructures from simpler ones. In the latter case, the nanoparticle components are electronically coupled; however, control over the attachment between nanoparticles is highly challenging and generally requires a delicate balance between dipole-, ligand-, and solvent-based interactions. To this end, we perform incomplete cation exchange with Ag+ (Cu+) on CdSe-seeded CdS nanorods and tetrapods to exclusively convert their tips into small Ag2S (Cu2S) domains. Selective removal of the ligands from these inorganic domains results in spontaneous, site-specific bridging of the nanoparticles. Using this method, we demonstrate the fabrication of polymer-like linear and branched nanoparticles with enhanced electrical properties, as well as the stoichiometric formation of nanoparticle homo- and heterodimers and tetramers. We show that linked structures can then be completely cation exchanged with Pb2+ to generate PbSe/PbS-based nanostructured photodetector media with enhanced properties.
License type:
PublisherCopyrights
Funding Info:
CO A*STAR Investigatorship grant (Project no. 1437C00135), A*STAR Science & Engineering Research Council Public Sector Funding (Project no. 1421200076), and a JSPS-NUS Joint Research Projects grant (WBS R143-000-611-133).
Description:
ISSN:
1530-6984
1530-6992
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