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Shiga, Japan

Yokura M.,Mie University | Yokura M.,Adwel R and D Co. | Hanada K.,Mie University | Uehara K.,Mie University | And 6 more authors.
Japanese Journal of Applied Physics | Year: 2012

Poly(ethylene terephthalate) (PET) films can be bonded directly by oxygen plasma irradiation and heat press at low temperatures of 100-160 °C. The irradiated films were kept in the atmosphere for six years, yet they can be bonded tightly. The irradiated surface is extremely active just after the irradiation, and it is considerably active after five years. Dry- and wet-peel tests suggest hydrogen bonding and chemical bonding. The films are bonded by these two elements at lower press temperatures, while by the pure chemical bonding at higher temperatures. Fourier transform infrared spectroscopy (FTIR) results on the non-irradiated, irradiated and bonded samples indicate that OH and COOH groups are created at the surface, they are responsible for the both bondings. Dehydrated condensation reaction is proposed for the chemical bonding. The hydrogen bonding is broken by water penetration, causing smaller peel strength under the wet-peel test. Cross-linking layer may be the origin for the long lifetime. # 2012 The Japan Society of Applied Physics. © 2012 The Japan Society of Applied Physics. Source


Uehara K.,Mie University | Uehara K.,Adwel R and D Co. | Okada A.,Mie University | Okamoto A.,Mie University | And 10 more authors.
Japanese Journal of Applied Physics | Year: 2012

Hexagonal ZnO was grown on a hexagonal (001) sapphire substrate. Then cubic La(Sr)MnO3 (LSMO) was grown on a ZnO underlayer by ion beam sputtering at various substrate temperatures to obtain double-layers of LSMO/ZnO and to investigate hetero-epitaxial orientation growth. Out-of-plane (001)-oriented ZnO was grown with an in-plane orientation of [1010](001)ZnO k [1120](001)sapphire (B-mode). Three phases of LSMO with out-of-plane (001), (110), and (111) orientations were grown on (001) ZnO generally. However, each single phase of LSMO could be grown only by controlling the deposition conditions. We achieved the in-plane orientation growth of LSMO, [110](001)LSMO k [1010](001)ZnO (B-mode), [110](110)LSMO || [1010](001)ZnO (A-mode), and [110](111)LSMO k [1120](001)ZnO (B-mode). The A-mode is defined as the mode in which both in-plane fundamental axes are parallel. The B-mode entails no parallel axes. The LSMO(001)- and (110)-grains have three equivalent in-plane domains, and the LSMO(111)-grain has a single domain. Lattice matching calculation can be used to partially interpret the orientation growth. # 2012 The Japan Society of Applied Physics. © 2012 The Japan Society of Applied Physics. Source

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