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문태호,윤원기,이승윤,지광선,어영주,안세원,이헌민,Moon, Tae-Ho,Yoon, Won-Ki,Lee, Seung-Yoon,Ji, Kwang-Sun,Eo, Young-Joo,Ahn, Seh-Won,Lee, Heon-Min The Korean Vacuum Society 2010 Applied Science and Convergence Technology Vol.19 No.2
ZnO:Al 박막은 산소 압력을 조절한 두 번의 증착 과정을 이용하여, DC 펄스 마그네트론 스퍼터링 방법에 의해 증착되었다. 시드막은 다양한 Ar/$O_2$ 압력비에서 증착되었으며, 벌크막은 순수한 Ar가스를 사용하여 증착되었다. 시드막 증착시 산소 압력이 증가함에 따라, 결정성과 (002) 배향성의 정도는 증가했다. 비저항은 시드가 없는 샘플의 경우 $4.7\times10^4\Omega{\cdot}cm$ cm로부터 Ar/$O_2$ = 9/1 샘플의 경우 $3.7\times10^4\Omega{\cdot}cm$까지, 결정성의 증가와 함께 점차 감소했다. 에칭된 표면은 분화구 형상의 구조를 보여주었으며, 급격한 형상 변화가 결정성 증가와 함께 나타났다. Ar/$O_2$= 9/1 조건의 샘플은 500 nm 에서 88%의 매우 높은 haze 수치를 보여주었으며, 이는 AFM 이미지에서 보여지는 것처럼 큰 표면 구조 크기에 의해 설명된다. ZnO:Al films were deposited by DC-pulsed magnetron sputtering using a two-step process involving the control of the oxygen pressure. The seed layers were prepared with various Ar to oxygen flow ratios and the bulk layers were deposited under pure Ar. As the oxygen pressure during the deposition of the seed layer increased, the crystallinity and degree of (002) texturing increased. The resistivity gradually decreased with increasing crystallinity from $4.7\times10^4\Omega{\cdot}cm$ (no seed) to $3.7\times10^4\Omega{\cdot}cm$ (Ar/$O_2$ = 9/1). The etched surface showed a crater-like structure and an abrupt morphology change appeared as the crystallinity was increased. The sample deposited at an Ar/$O_2$ flow ratio of 9/1 showed a very high haze value of 88% at 500 nm, which was explained by the large feature size of the craters, as shown in the AFM image.
Off-gas Analyzer를 이용한 하수처리장 단일선회류 방식 포기시스템 산소전달 효율의 평가
박보화 ( Bo Hwa Park ),고광백 ( Kwang Baik Ko ),박재한 ( Jae Han Park ),임세호 ( Se Ho Lim ),신동록 ( Dong Rok Shin ),윤혜정 ( Hye Jung Yun ),이지영 ( Ji Young Lee ),문태호 ( Tae Hoon Moon ) 한국물환경학회 ( 구 한국수질보전학회 ) 2006 한국물환경학회지 Vol.22 No.3
The supply of oxygen for aeration is the largest energy consumer at activated sludge wastewater treatment plants. Replacement of less efficient aeration systems with fine pore aeration devices can save up to 50 percent of aeration energy costs. The purpose of this study was the diagnosis and evaluation of a domestic wastewater aeration system by the off-gas method which had been studied by US EPA and ASCE. For this study, an off-gas analyzer and its hood were made to collect off-gas. Also, a vacuum pump was connected to the analyzer to make suction of off-gas. Experiments were conducted at a domestic activated sludge wastewater treatment plant which had a single spiral roll aeration system installed with P.E tube diffuser. Data on OTE(f), SOTE(pw), OUR, and air flow rate were obtained from these experiments. In case of replacing an aeration system, it is recommended that it should be replaced with perforated membrane disc or ceramic disc fine bubble diffusers installed in a full floor coverage or grid pattern.
황경환 ( Kyong Hwan Hwang ),김종민 ( Jong Min Kim ),정대룡 ( Dae Ryong Jung ),김천중 ( Chun Joong Kim ),문태호 ( Tae Ho Moon ),손동연 ( Dong Yeon Son ),박병우 ( Byung Woo Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.4
To understand the photoluminescence (PL) mechanisms of nanophosphors, various experiments were conducted. The SnO2:Eu3+ nanoparticles were synthesized and calcined at various temperatures. The increase of the PL intensities with the increasing calcination temperature was due to the removal of the hydroxyl groups, and to the decrease of the surface area caused by the growth of the nanoparticles. Additionally, Mn-doped zinc sulfide monodispersed-nanoparticles were synthesized. The influence of Mn doping concentration was investigated with the decrease of crystallinity and capping. The increased crystallinity and removal of water/organic capping were suggested for the reasons of increased PL property.