期刊
RADIATION PHYSICS AND CHEMISTRY
卷 142, 期 -, 页码 100-106出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2017.02.052
关键词
Ion beam; Nanowires; Radiation-induced polymerization; Radiation-induced crosslinking; Dissociative electron attachment
资金
- MEXT, Japan [26249145]
- Sekisui Chemical Grant Program
- Foundation for The Promotion of Ion Engineering
- Amada Foundation
- Grants-in-Aid for Scientific Research [15K06677, 26249145, 26102011, 15K21721] Funding Source: KAKEN
Irradiation of high-energy ion particles on organic films induced solid-state polymerization and crosslinking reactions of the materials along the ion trajectories, resulting in the formation of insoluble uniform nanowires with a precise diameter. The nanowires were isolated by the development process i.e. the irradiated film was immersed in organic solvents, and their morphology was visualized by atomic force microscopy. The target organic materials are 4-vinyltriphenylamine, poly(4-vinyltriphenylamine), and polystyrene derivatives with/without the partial substitutions by halogen atoms. It was found that 4-vinyltriphenylamines, in spite of their small molecular sizes, afforded nanowires more clearly than poly(4-vinyltriphenylamine)s. Moreover, the efficiency of demonstrated polymerization/crosslinking reactions obviously depends on the substituted halogen atom species. The averaged diameters of nanowires from bromo- or iodo-substituted 4-vinyltriphenylamine (9.3 and 9.4 rim, respectively) were larger than that obtained from simple 4-vinyltriphenylamine (6.8 nm). The remarkable effect of halogenation of aromatic compounds on the efficiency of the radiation-induced reactions was also observed for polystyrene derivatives. This contrast was considered to originate from the sum of the efficiency of elementary reactions including dissociative electron attachment.
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