| 초록 |
In this presentation latest developments concerning the use of self-assembled block copolymers for nanotechnology and nanofabrication are discussed. First, various simple routes to fabricate patterned inorganic nanostructures are presented using block copolymer thin films as templates. Asymmetric block copolymers provide a novel route by which ordered arrays of nanocylinders aligned normal to the film surface are produced by one-step spin coating from solution. Here poly(styrene-co-ethylene oxide) block copolymer (PS-b-PEO) and poly(styrene-co-2-vinyl pyridine) block copolymer (PS-b-P2VP) were employed as scaffolds to incorporate inorganic materials within the cylindrical PEO and VP domains. Highly dense arrays of hexagonally-packed silica, titania, and composite titania/gold dots were fabricated by chemical vapor deposition (CVD) methodology or sol-gel chemistry. The lateral spacing, i.e. the center-to-center distance between the dots and the size of the dots, were fine tuned by controlling the ralative amount of inorganic precursors to the block copolymers. Such site-specific inorganic dot arrays patterned on a nanometer scale can have widespread uses for sensory and optoelectronic applications. Second, the potential application of block copolymer thin films as a planar optical waveguide is considered. To this end, thin films of poly(styrene-co-methyl methacrylate) block copolymer (PS-b-PMMA) with cylindrical PMMA nanodomains oriented normal to the substrate were coupled to glass prism in Kretschmann configuration. Thus, the operation for guiding optical coupling modes by the film and processes occuring inside the film were studied by optical waveguide lightmode spectroscopy (OWLS). |
