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Dendrimer Mediated ‘Bricks and Mortar’ Self-Assembly of Nanoparticles

Published online by Cambridge University Press:  11 February 2011

Benjamin L. Frankamp ,
Andrew K. Boal  and
Vincent M. Rotello
Benjamin L. Frankamp
Affiliation:
Department of Chemistry University of Massachusetts, Amherst Amherst MA, 01301
Andrew K. Boal
Affiliation:
Department of Chemistry University of Massachusetts, Amherst Amherst MA, 01301
Vincent M. Rotello
Affiliation:
Department of Chemistry University of Massachusetts, Amherst Amherst MA, 01301
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Abstract

Control of particle-particle spacing is a key determinant of optical, electronic, and magnetic properties of nanocomposite materials. We have used poly(amidoamine) (PAMAM) dendrimers to assemble carboxylic acid-functionalized mixed monolayer protected clusters (MMPCs) through acid/base chemistry between particle and polymer. IR spectroscopy and selective dendrimer staining, observed by Transmission Electron Microscopy (TEM), establish that the PAMAM dendrimers are the mortar in the assembly and act to space the MMPCs in the resulting aggregates. Small angle X-ray scattering (SAXS) was then used to establish average interparti cle distances; five generations of PAMAM dendrimer (0, 1, 2, 4, 6) were investigated and monotonic increase in interparticle spacing from 4.1 nm to 6.1 nm was observed.

Initial studies involving the application of this methodology to control the magnetic properties of 3-iron oxide nanoparticles have been completed. γ-Iron oxide nanoparticles (6.5 nm in diameter) have been assembled with PAMAM dendrimers generations 2.5, 4.5, and 6.5. The resulting aggregates were characterized with SAXS and magnetization obtained on a super conducting quantum interference devise (SQUID). An observed correlation between the blocking temperature (TB) and the average interparticle spacing suggests that our methodology could be used to tailor the magnetic profile of the nanoparticles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 739: Symposium H – Three-Dimensional Nanoengineered Assemblies , 2002 , H7.38
Copyright
Copyright © Materials Research Society 2003

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References

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