Web Release Date: October 25,
Control of Stripelike and Hexagonal Self-Assembly of Gold Nanoparticles by the Tuning of Interactions between Triphenylene Ligands
and
Contribution from the School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi-shi, Ishikawa, 923-1292, Japan, and PRESTO/Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan
Received May 17, 2007
Abstract:
We describe the self-assembly of gold nanoparticles (Au NPs) protected with newly synthesized
discotic liquid crystalline molecules of hexaalkoxy-substituted triphenylene (TP) in mixed toluene/methanol
solvent. The stripelike (i.e., 2D consisting of linear 1D in stripe) self-assembly is realized successfully by
the aid of 
- stacking of TP ligand on Au NPs. The smaller Au NPs with TP (AuTP) or the longer alkyl
chain between TP and the gold core provide more free spaces among TP moieties. These spaces allow
easy insertion of TP on adjacent AuTPs to lead an interparticle - interaction to form the stripelike
arrangement. The solvent hydrophilicity can also serve as a controlled index to tune arrangement among
stripelike, hexagonal close packed (hcp), or disorder. We have changed the solvent hydrophilicity by
changing the ratio of methanol to toluene, which affects the balance of solution of AuTP (in toluene) and
deposition (in methanol). The larger space between TPs and appropriate solvent hydrophilicity realize
stripelike self-assembly caused by a strong - interaction between TPs, which was characterized by
TEM, as well as fluorescence, dynamic light scattering, and 1H NMR spectra.
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