Guided Assembly of Block Copolymers in Three-Dimensional Woodpile Scaffolds.
Three-dimensional (3D) nanofabrication using the directed self-assembly of block copolymers (BCPs) holds great promise for the nanoscale device fabrication and integration into 3D architectures over large areas with high element densities. In this work, a robust platform is developed for building 3D BCP architectures with tailored functionality using 3D micron-scale woodpile structures (WPSs), fabricated by a multiphoton polymerization technique. By completely filling the spaces of the WPSs and using the interactions of the blocks of the BCPs with the struts of the WPS, well-developed 3D nanoscopic morphologies are produced. Metal ion complexation with one block of the copolymer affords a convenient stain to highlight one of the microdomains of the copolymer for electron microscopy studies but also, with the reduction of the complexing salt to the corresponding metal, a simple strategy is shown to produce 3D constructs with nanoscopic domain resolution.
['Choi|Jaewon|J|', 'Koo|Sangmo|S|', 'Sakellari|Ioanna|I|', 'Kim|Hyeyoung|H|', 'Su|Zhengliang|Z|', 'Carter|Kenneth R|KR|http://orcid.org/0000-0002-7081-2296', 'Farsari|Maria|M|', 'Grigoropoulos|Costas P|CP|', 'Russell|Thomas P|TP|http://orcid.org/0000-0001-6384-5826']
block copolymers directed self-assembly woodpile structures multiphoton polymerization laser direct writing