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Golden potential for gold thin films
Date:4/27/2012

arch group have been advancing towards this goal for the past decade. In a study earlier this year, they were able to induce rod-shaped semiconductor nanocrystals to self-assemble into one-, two- and even three-dimensional macroscopic structures. With this latest application of their methods to thin films, they have moved into the realm of material forms that are required for device fabrication and are well-suited for scalable nanomanufacturing.

"This is the first time that 2-D nanoparticle assembly, similar to those obtained using DNA linkers and controlled solvent evaporation, can be clearly achieved in multi-layers in supramolecule-based nanocomposite thin films," Xu says. "Our supramolecular approach does not require chemical modification to any of the components in the composite system and, in addition to providing a means of building nanoparticle-based devices, should also provide a powerful platform for studying nanoparticle structure-property correlations."

The technique developed by Xu and her colleagues uses solutions of block co-polymer supramolecules to direct the self-assembly of nanoparticles. A supramolecule is a group of molecules that act as a single molecule able to perform a specific set of functions. Block copolymers are long sequences or "blocks" of one type of monomer bound to blocks of another type of monomer that have an innate ability to self-assemble into well-defined arrays of nano-sized structures over macroscopic distances.

"Block copolymer supramolecules self-assemble and form a wide range of morphologies that feature microdomains typically a few to tens of nanometers in size," Xu says. "As their size is comparable to that of nanoparticles, the microdomains of block copolymer supramolecules provide an ideal structural framework for the co-self-assembly of nanoparticles."

In this latest study, Xu and her colleagues incorporated gold nanoparticles into solutions of block co-polymer supramolecules to for
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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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