Tokyo Institute of Technology · Materials Science
Professor Teruaki Hayakawa's research lab specializes in the design and self-assembly of block copolymers to create functional nanostructured materials with precise control over morphology and surface properties. The lab focuses on developing advanced fabrication methods for vertically oriented nanostructures, such as lamellae and cylinders, using solvent annealing and plasma etching techniques. Key research directions include the creation of chemically and topologically heterogeneous surfaces, the integration of π-conjugated segments for optoelectronic applications, and the engineering of fluorinated end groups to tune thermal transitions and phase behavior. The work bridges polymer chemistry, nanofabrication, and materials science for applications in nanolithography, flexible electronics, and functional coatings.
Figures are computed from collected data and may differ slightly.
We report the self-assembly of organic-inorganic block copolymers (BCP) in thin-films by simple solvent annealing on unmodified substrates. The resulting vertically oriented lamellae and cylinders are converted to a hard silica mask by a single step highly selective oxygen plasma etching. The size of the resulting nanostructures in the case of cylinders is less than 10 nm.
Self-organization on three length scales is exhibited by a block copolymer of styrene and an oligothiophene-bearing isoprene in cast films. For example, a phase-separated nanostructure consisting of π-conjugated oligothiophene molecules is self-aligned perpendicular to the substrate, as revealed in a TEM image of a section through the film (see picture). Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2003/z19877_s.pdf or from the au
Poly(styrene-b-semifluorinated isoprene) block copolymers with −CF2H-terminated side groups were synthesized by the esterification reaction of a poly(styrene-b-hydroxylated 1,2-/3,4-isoprene) block copolymer with semifluorinated acid chlorides. Two distinct first-order transitions were observed by DSC measurements in the resulting block copolymers at temperatures below the glass transition of polystyrene. The transition temperatures of the longer fluorocarbon units (10 −CF2− units) were found to
A novel fabrication of the chemically and topologically heterogeneous patterns on the surface of polymeric films over an area of more than 1 square centimeter in a single step was demonstrated by using the self-organizing character of polystyrene-b-oligothiophene block copolymers. Hexagonally arranged open pores of a size of approximately 2 mum are spontaneously formed by casting the polymer solution under a moist air flow. The amphiphilic character of the polystyrene-b-oligothiophene block copo
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