Selective intercalation of functionalized nanoparticles into diblock copolymers

ANYL 188

Andrew N. Mangham1, Divya Goel, divyagoel@wisc.edu1, Huiman Kang, kangh@cae.wisc.edu2, Paul F. Nealey, nealey@engr.wisc.edu2, and Robert J. Hamers, rjhamers@facstaff.wisc.edu3. (1) Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, (2) Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Engineering Hall, 1415 Engineering Drive, Madison, WI 53706, (3) Department of Chemistry, University of Wisconsin - Madison, 1101 University Avenue, Madison, WI 53706
Thin films of diblock copolymers show long-range nanoscale order and offer a powerful route to self-assembled nanocomposites. We show that by tailoring the surface functionalization of CdSe nanoparticles, we can selectively intercalate nanoparticles into either domain of a PS-b-PMMA thin film. Scanning electron microscopy shows that CdSe nanoparticles functionalized with tetradecylphosphonic acid (TDPA) exhibit selective intercalation into the polystyrene domain of a thin film. We demonstrate that TDPA-modified nanoparticles that have undergone appropriate ligand exchange reactions can be induced to selectively intercalate into the polymethylmethacrylate domain. Nanoparticle functionalization was characterized using infrared spectroscopy to optimize ligand exchange and establish thermal stability under the annealing conditions. Application of these surface functionalization strategies to TiO2 nanoparticles demonstrates that interfacial interactions between nanoparticle ligands and diblock copolymer domains offers a flexible, powerful tool for self-assembled arrays of nanoscale materials.
 

Directed Assemblies Using Surface Templates
1:25 PM-4:45 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 335, Oral

Division of Analytical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008