title: Fabrication of nanobeads from nanocups by controlling scission/crosslinking in organic polymer materials.
abstract: The development of several kinds of micro/nanofabrication techniques has resulted in many innovations in the micro/nanodevices that support today's science and technology. With feature miniaturization, the fabrication tools have shifted from light to ionizing radiation. Here, we propose a simple micro/nanofabrication technique for organic materials using a scanning beam (SB) of ionizing radiation. By controlling the scission/crosslinking of the material via three-dimensional energy-deposition distribution of the SB, appropriate solvents can easily peel off only the crosslinked region from the bulk material. The technique was demonstrated using a focused ion beam and a chlorinated organic polymer. The polymer underwent main-chain scission upon irradiation, but it crosslinked after high-dose irradiation. Appropriate solvents could easily peel off only the crosslinked region from the bulk material. The technique, 'nanobead from nanocup', enabled the production of desired structures such as nanowires and nanomembranes. It can be also applied to the micro/nanofabrication of functional materials.
authors.affiliation: Quantum Beam Science Directorate, Japan Atomic Energy Agency, Takasaki, Gunma, Japan. t.oyama2@kurenai.waseda.jp
authors.forename: Tomoko Gowa
authors.initials: TG
authors.lastname: Oyama
authors.forename: Akihiro
authors.initials: A
authors.lastname: Oshima
authors.forename: Masakazu
authors.initials: M
authors.lastname: Washio
authors.forename: Seiichi
authors.initials: S
authors.lastname: Tagawa
mesh_terms: D003432:Cross-Linking Reagents / Q000737:chemistry* / Q000528:radiation effects; D020450:Heavy Ions; D046911:Macromolecular Substances / Q000737:chemistry / Q000528:radiation effects; D008422:Materials Testing; D008968:Molecular Conformation; D054118:Nanospheres / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects; D010316:Particle Size; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties / Q000528:radiation effects
chemical_list: D003432:Cross-Linking Reagents; D046911:Macromolecular Substances; D009930:Organic Chemicals; D011108:Polymers