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Volume 143, 2009
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Free-standing porous supramolecular assemblies of nanoparticles made using a double-templating strategy

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Abstract

The formation of stable and ordered free-standing porous supramolecular assemblies of nanoparticles with sizes and geometries controlled at different length scales is demonstrated by a double-templating strategy. Our technique combines the directed assembly of particles, templating using nanoimprint lithography (NIL), and supramolecular layer-by-layer (LbL) assembly. First, 500-nm β-cyclodextrin (CD)-functionalized polystyrene (PS) particles were assembled by convective assembly onto a sacrificial polymer template patterned with a predefined geometry and size using NIL, forming a 3D crystal architecture of particles. LbL assembly of alternating supramolecular host- and guest-functionalized glues of CD-functionalized Au (Au-CD) nanoparticles and adamantyl (Ad) dendrimers, sized between 3–5 nm, within the preformed PS-particle crystal effectively bound the particles together into a particle composite. These particle composites were released from the substrate together with the polymer template, and transferred onto a target substrate. The particle crystal integrity, order and functionality were preserved. Rinsing the structure with dichloromethane removed the PS core material together with the polymer template, resulting in interconnected porous capsules, the sizes and shapes of which are fully determined by the PS core size and the polymer template definition. Again, integrity and shape were preserved in the rinsing step. These capsules were capable of storing organic fluorescent molecules using specific interactions.

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Article information


Submitted
10 Dec 2008
Accepted
09 Mar 2009
First published
30 Jun 2009

Faraday Discuss., 2009,143, 117-127
Article type
Paper

Free-standing porous supramolecular assemblies of nanoparticles made using a double-templating strategy

X. Y. Ling, I. Y. Phang, D. N. Reinhoudt, G. J. Vancso and J. Huskens, Faraday Discuss., 2009, 143, 117 DOI: 10.1039/B822156A

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