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Synthesis and Characterization of Resorcinarene-Encapsulated Nanoparticles

Published online by Cambridge University Press:  21 February 2011

Alexander Wei ,
Kevin B. Stavens ,
Stephen V. Pusztay  and
Ronald P. Andres
Alexander Wei
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907 (alexwei@purdue.edu)
Kevin B. Stavens
Affiliation:
Department of Chemical Engineering, Purdue University, West Lafayette, IN 47907
Stephen V. Pusztay
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907
Ronald P. Andres
Affiliation:
Department of Chemical Engineering, Purdue University, West Lafayette, IN 47907
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Abstract

A new strategy for stabilizing inorganic nanoparticles in nonpolar solutions is described. Resorcinarenes 1-3 were synthesized and evaluated as surfactants because of their large concave headgroups with multiple contact sites. Au nanoparticles ranging from 3-20 nm in diameter were generated in the vapor phase and dispersed into dilute hydrocarbon solutions of 1-3, where they were stabilized for up to several months. Chemisorption is most likely mediated by multiple Au-O interactions, as indicated by several control experiments and by surface-enhanced Raman spectroscopy. The resorcinarenes were readily displaced by dodecanethiol, which resulted in the precipitation of particles >5 nm as determined by absorption spectroscopy and transmission electron microscopy. This suggests that the mobility of the resorcinarene tailgroups are important for maintaining the larger nanoparticles in a dispersed state. Resorcinarene surfactants with stronger chemisorptive properties are currently being explored.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 59
Copyright
Copyright © Materials Research Society 2000

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References

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