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論文

Identification of structures of the deep levels in 4H-SiC

中根 浩貴*; 加藤 正史*; 市村 正也*; 大島 武

Materials Science Forum, 778-780, p.277 - 280, 2014/02

Annealing behavior of the carrier lifetime and the deep levels in electron irradiated n-type and semi-insulating hexagonal (4H) silicon carbide (SiC) was studied. As a result of photo induced current transient spectroscopy (PICTS) measurements, two peaks were observed for each sample. The height of those peaks depended on annealing temperature. Comparing the annealing behavior of the peak height with temperature dependence of concentrations of various defects reported previously, we speculated that the observed peaks originate from either divacancy of silicon vacancy and carbon vacancy (V$$_{Si}$$V$$_{C}$$) or pair of carbon antisite and carbon vacancy (C$$_{Si}$$V$$_{C}$$).

口頭

Emulsification technology of Aomori Hiba oil and its' antibacterial effect against staphylococci

岡部 敏弘*; 小野 浩之*; 畑山 一郎*; 和栗 敦*; 澤田 譲*; 津川 秀仁*; 市田 忠夫*; 中根 明夫*; 佐野 輝男*; 田中 和明*; et al.

no journal, , 

The oil extracted from Aomori Hiba has excellent antibacterial and insecticidal effects. To heighten the added value of the Aomori Hiba oil, the water-soluble nano-hiba oil with about 10 nm of particle size was developed by applying emulsification technology to the oil. The emulsified Aomori Hiba oils showed no signs of phase separation and remained intact even six months after its preparation. Since the nano-hiba oil can be sprayed quickly, antibacterial examinations were carried out to explore potential applications in preventions of hospital infection and damages caused by blight and insect in agricultural environments. Furthermore, a novel antibacterial material composed of nano-hiba oil and water-absorption gel was investigated. Hydroxypropyl cellulose hydrogels as support materials for the nano-hiba oil were prepared by irradiating their paste-like solutions. Subsequently, absorbability in nano-hiba oil as well as the antibacterial effects were evaluated. The hydrogels showed excellent antibacterial effect up to three weeks. Therefore, it was suggested that the hydrogels containing nano-hiba oil are suitable as antibacterial materials.

口頭

青森ヒバ油のエマルション化技術とナノヒバ油の応用

廣木 章博; 岩永 繁; 玉田 正男; 岡部 敏弘*; 小野 浩之*; 畑山 一郎*; 和栗 敦*; 澤田 譲*; 中根 明夫*; 佐野 輝男*

no journal, , 

青森県特産の青森ヒバから抽出される油「ヒバ油」は、細菌や真菌に対し優れた抗菌性が明らかにされているものの、水での希釈が困難なため利用範囲が一部の生活用品に留まっていた。そこで、利用範囲拡大のために水に均一に分散するヒバ油を得ることを目的として、乳化剤を用いたエマルション化について検討した。その結果、乳化条件を調節してヒバ油のエマルション粒径を200nm程度以下にすることで、半年に及ぶ経時安定性や希釈時の粒径安定性に優れた実用的なヒバ油製剤(ナノヒバ油)を開発することができた。開発したナノヒバ油は、ミスト状で噴霧することができ、ヒバ油と同程度の抗菌活性を示すことがわかった。さらに、ペースト状ヒドロキシプロピルセルロース水溶液に放射線照射することで得られたゲルをナノヒバ油の保持材とすることで、植物由来多糖類を原料とした環境に優しい抗菌ゲルを開発した。ゲルが吸収するナノヒバ油の量は、乾燥ゲル重量の5$$sim$$20倍量に達し、ナノヒバ油の種類により異なった。中でもシリカ含有ナノヒバ油を保持したゲルでは、シリカを含まないものに比べ約1.5倍の膨潤度を示し、白癬菌に対する抗菌活性は、約1か月前後も持続することが明らかとなった。

口頭

Deep levels in electron irradiated semi-insulating 4H-SiC; Electronic, optical and structural observation

中根 浩貴*; 加藤 正史*; 市村 正也*; 大島 武; Ivanov, I. G.*; Trinh, X. T.*; Son, N. T.*; Janz$'e$n, E.*

no journal, , 

Deep level defects in Silicon Carbide (SiC) were studied using photo-induced current transient spectroscopy (PICTS), electron paramagnetic resonance (EPR) and photoluminescence (PL). Deep levels were introduced into high-purity semi insulating 4H-SiC samples by 2 MeV-electron irradiation. After the electron irradiation, the samples were annealed between 200 and 1000 $$^{circ}$$C. In the samples annealed at 400 $$^{circ}$$C or higher temperatures, we observed six different peaks from PICTS measurements. We labeled these peaks as a, b, c, d, e and f. As a result of the dependence of the peak heights on annealing temperature, the heights of all peaks increase monotonically with annealing temperature. In our previous report, we observed peaks labeled as A and B, which were speculated to be related to C$$_{Si}$$V$$_{C}$$ and the EI4 center identified by EPR. Peak temperatures and annealing behavior of peaks A and B are similar to those of peaks d and f, respectively, while other peaks a, b, c and e were not observed in our previous studies. The PL peaks at 433 and 442 nm were observed in all the studied samples, whereas peaks at 428 and 429 nm were observed in the samples annealed above 200 $$^{circ}$$C, and a peak at 427 nm was observed in samples annealed above 400 $$^{circ}$$C. Considering the annealing temperature dependence of the PICTS and PL peaks, the PL peak at 427 nm may correspond to either one of PICTS peaks a, b, d, e, and f.

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