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예열 온도 변화에 따른 Sol-Gel 법에 의해 제작된 ZnO 박막의 물리적 특성 연구
김익주,한호철,이충선,송용진,태원필,서수정,김용성 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.2
출발물질로 zinc acetate dihydrate(Zn($CH_3$COO)$_2$$.$2$H_2O$)를 사용하였고, 이 물질을 isopropanol(($CH_3$)$_2$CHOH)-monoethanolamine(MEA:H$_2$NCH$_2$C$H_2O$H) 용액에 용해하여 균일하고 안정한 sol을 만들었다. Sol-gel spin-coating 법에 의해 ZnO 박막을 제조시 예열 온도에 따른 박막의 c-축 배향성과 그 물리적 특성을 조사하였다. c-축으로의 성장은 예열 온도의 변화에 따라 차이를 보였으며. 275$^{\circ}C$에서 예열 후 $650^{\circ}C$에서 최종 열처리한 ZnO 박막은 XRD 측정결과 기판에 수직한 (002) 방향으로 강한 배향성을 나타내었다 200∼30$0^{\circ}C$에서 예열 후, $650^{\circ}C$에서 최종 열처리한 ZnO 박막은 UV-vis측정결과 가시광선 영역에서 온도에 따른 투과도의 변화를 보이지만 평균 85% 이상의 높은 투과도를 보였다. 또한 370nm 부근에서 흡수단을 나타내었으며, 광학적 밴드갭은 약 3.22 eV로 나타났다. 발광방출(PL) 측정결과, 황색(620nm, 2.0 eV)발광이 관찰되어, 무기발광 소자로의 응용 가능성을 나타내었다. A homogeneous and stable ZnO sol was prepared by dissolving the zinc acetate dihydrate(Zn(CH$_3$COO)$_2$$.$2H$_2$O) in solution of isopropanol((CH$_3$)$_2$$.$CHOH) and monoethanolamine(MEA:H$_2$NCH$_2$CH$_2$OH). ZnO thin films were prepared by sol-gel spin-coating method and investigated for c-axis preferred orientation and physical properties with preheating temperature. The c-axis growth had a difference as increaing preheating temperature. ZnO thin film preheated at 275$^{\circ}C$ and post-heated at 650$^{\circ}C$ was highly oriented along the (002) plane. After preheating at 200∼300$^{\circ}C$ and post-heating at 650$^{\circ}C$, the transmittance of ZnO thin films by UV-vis. measurement was over 85% in visible range and exhibited absorption edges at about 370 nm. The optical band gap energy was obtained about 3.22 eV, The photoluminescence emission characteristics of ZnO thin film preheated at 275$^{\circ}C$ and post-heated at 650$^{\circ}C$ was found to orange emission(620 nm, 2.0 eV) by PL measurement, which revealed the possibility for application of inorganic photoluminescence device.
P형 4H-SiC 기판에 형성된 ZnO 박막/나노선 가스 센서의 300℃에서 CO 가스 감지 특성
김익주,오병훈,이정호,구상모,Kim, Ik-Ju,Oh, Byung-Hoon,Lee, Jung-Ho,Koo, Sang-Mo 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.2
ZnO thin films were deposited on p-type 4H-SiC substrate by pulsed laser deposition. ZnO nanowires were formed on p-type 4H-SiC substrate by furnace. Ti/Au electrodes were deposited on ZnO thin film/SiC and ZnO nanowire/SiC structures, respectively. Structural and crystallographical properties of the fabricated ZnO thin film/SiC and ZnO nanowire/SiC structures were investigated by field emission scanning electron microscope and X-ray diffraction. In this work, resistance and sensitivity of ZnO thin film/SiC gas sensor and ZnO nanowire/SiC gas sensor were measured at $300^{\circ}C$ with various CO gas concentrations (0%, 90%, 70%, and 50%). Resistance of gas sensor decreases at CO gas atmosphere. Sensitivity of ZnO nanowire/SiC gas sensor is twice as big as sensitivity of ZnO thin film/SiC gas sensor.
해양에서 열화된 완도선 수침고목재의 화학적.미시형태적 변화
김익주,Kim, Ik-Joo 국립문화재연구소 1990 保存科學硏究 Vol.11 No.-
Chemical and micro morphological changes of archaeological waterlogged woods from shipwrecked materials in marine situations were investigated which were submerged in seabed for over 900 years. Tested Wood species were Pinusdensiflora, Zelkova serrata, Quercus acutissima and Camellia japonica. The obtained results were summarized as follows; Chemical analysis showed that lignin content was increased, whereas the amout of holocellulose was heavily decreased in the degraded archaeological lwoods(DAW), when compared to the recent woods. The amount of alkalineextractives in the DAW was extremley high. IR spectra showed that disappearance of absortion band at $1,730㎝^-1$ intensity increase at 1,600, 1,500 and $1,270㎝^-1$ and the emergence of single band around $1,050㎝^-1$.Microscopic investigation showed that cell wall of latewood tracheids and fiber in the DAW were severely degraded while, early wood tracheids less degraded. Degradation in the cell wall was mainley occurred in $S_2$layer, while the middle lamella was the least degraded. The micro morphological characteristics of DAW were separation of secondary wall from middle lamella, cavities aligned with micro fibril angle in $S_2$layer and granular appearance of secondary wall by the bacterial attack.
김익주,Kim, Ik-Ju 국립문화재연구소 1986 保存科學硏究 Vol.7 No.-
The degradation of wood is maimly caused by biological and thermal factor. In general, the field of wood preservation can be divided into two broadcategories; namely the deterioration, protection of wood, and the teatment of wood with preservatives. Wood in sea or brackish water incurs marine borer damage, consisting of attack by marine animal and also wood on land suffers severely from insect damage. But the largest wood degradation is caused by microorganism. Animals that attack wood in a marine environment are especially destructive in warm water-regions, little was achieved in their control recently. Therefore this manuscript only introduce the importance of wood deterioration caused by marine animal.
4H-SiC 기판의 a-, c-, m-면방향에 따른 ZnO 나노선의 Photoluminescence 특성 분석
김익주,여인형,문병무,강민석,구상모,Kim, Ik-Ju,Yer, In-Hyung,Moon, Byung-Moo,Kang, Min-Seok,Koo, Sang-Mo 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.5
ZnO thin films were deposited on a-, c- and m- plane oriented 4H-SiC substrates by pulsed laser deposition. ZnO nanowires were formed on substrates by tube furnace. Shape and density of the ZnO nanowires were investigated by field emission scanning electron microscope. Average surface roughness and root mean square surface roughness were measure by atomic force microscope. Optical properties were investigated by Photoluminescence measurement. Density of ZnO nanowires grown on a-, c- and m-plane oriented 4H-SiC substrates were 17.89 ${\mu}m^{-2}$, 9.98 ${\mu}m^{-2}$ and 2.61 ${\mu}m^{-2}$, respectively.
강민혜, 조우현, 김익주 공주대 문화재보존과학연구소 2011 문화재과학기술 Vol.10 No.1
2009년 나주시 문화 류씨 문중선산에서 이장 도중 발굴된 류지경의 출토복식을 보존처리하였 다. 일부 유물은 직물의 강도 및 탄성회복력이 저하되어 있어 적은 힘의 물리력에도 쉽게 손상되었다. 고형오염물 때문에 한꺼번에 고착된 상태로 수습되었던 염습의는 유물의 안정적인 보존을 위해 분리 하고 개별 조사하였다. 고형오염물은 수작업으로 제거하였고 오염도에 따라 계면활성제의 양을 조절 하며 습식 세척하였다. 보강은 최소한으로 하였으며 심하게 파손된 부분을 중심으로 형태고정 및 보강 하였고, 완형복원은 하지 않았다.