An experiment was conducted to construct plasmonic heterostructures in organized arrays through chemical pattern directed assembly, a combination of top-down lithographic and bottom-up assembly techniques. Cross-linkable PS was synthesized and contained 4% glycidyl methacrylate as a cross-linkable group. Arrays of Au nanostructures were fabricated on various substrates including Si, indium tin oxide (ITO)-polyethylene naphthalate (PEN), and ITO-glass which allows for optical characterization with dark-field microscopy. For adsorption of citrate-coated Au NPs onto active regions with PEG brushes, a solution of large Au NPs was first spotted on the patterned area. The substrate was then rinsed with water and dried. The adsorption process was repeated with the medium and small Au NPs for sequential, site-specific immobilization onto the medium and small spots of the chemical pattern, respectively, to generate multicomponent trimer heterostructures. The ability to fabricate arrays of chemical nanopatterns and hence arrays of nanostructures with a wide variety of geometry, spacing, and size on a single chip renders the fabrication scheme a valuable platform for high-throughput nanomaterials design toward desired optical technologies.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering