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원추형 기판 위에 탄소 나노튜브의 선택적 성장이 전계방출 특성에 미치는 영향
김부종,박진석,노영록 한국반도체디스플레이기술학회 2012 반도체디스플레이기술학회지 Vol.11 No.1
In this study, for use of carbon nanotubes (CNTs) as a cold cathode of x-ray tubes, we examine the effects of selective growth of CNTs on their field emission properties and long-term stability. The selective growth of CNTs was performed by selectively etching the catalyst layer which was used for CNTs’ nucleation. CNTs were grown on conical-type tungsten substrates using an inductively-coupled plasma chemical vapor deposition system. For all the grown CNTs, their morphologies and microstructures were analyzed by field-emission scanning electron microscope and Raman spectroscopy. The electron-emission properties of CNTs and the long-term stability of emission currents were measured and characterized according to the CNTs’ growth position on the substrate.
계면층 형성 및 열처리가 탄소 나노튜브 미세팁의 전계방출 특성에 미치는 영향
김부종,박진석 한국반도체디스플레이기술학회 2013 반도체디스플레이기술학회지 Vol.12 No.2
The effects of interlayer formation and thermal treatment on the field-emission properties of carbon nanotubes (CNTs) were investigated. The CNTs were prepared on tungsten (W) micro-tip substrates using the electrophoretic deposition (EPD) method. The interlayers, such as aluminum (Al) and hafnium (Hf) were coated on the W-tips prior to CNT deposition and after the deposition of CNTs all the species were thermally treated at 700 oC for 30 min. The field-emission properties of CNTs were significantly improved by thermal treatment. The threshold electric field for igniting the electron emission was decreased and the emission current was increased. The Raman spectroscopy results indicated that this was attributed mainly to the enhancement of CNTs by thermal treatment. Also, the CNTs deposited on the interlayers showed the remarkably improved results in the long-term emission stability, especially when they were thermally treated. The X-ray photoelectron spectroscopy (XPS) measurement confirmed that this was resulted from the formation of the additional cohesive forces between the CNTs and the underlying interlayers.
김부종,박종설,황영진,박진석 한국반도체디스플레이기술학회 2015 반도체디스플레이기술학회지 Vol.14 No.1
This study demonstrates hybrid-type transparent electrodes for touch screen panels. The hybrid-type electrodes were fabricated by coating carbon nanotubes (CNTs) on metal meshes. To form the metal-meshes, thin films of silver (Ag) were deposited on glass substrates using the sputtering method and then patterned via photolithography to obtain mesh structures whose line width was 10 µm and line-to-line spacing was 300 µm. CNTs were coated on Ag-meshes by using two different methods, such as spray coating and electrophoretic deposition (EPD). For the samples of a Ag-meshes and CNTs-coated Ag-meshes, their surface morphologies, electrical sheet resistances, and visible-range transmittances and reflectances were characterized and compared. The experimental results indicated that the reflectance of Ag-mesh electrodes was substantially reduced by coating of CNTs. Especially, the hybrid electrodes of Ag-meshes with EPD-coated CNTs showed excellent properties such as sheet resistance lower than 20 /□, transmittance higher than 90 %, and reflectance lower than 8 %.
재난 뉴스의 점화 효과: 지리적․심리적 거리의 상호작용을 중심으로
김부종,최윤경 한국문화및사회문제심리학회 2023 한국심리학회지: 문화 및 사회문제 Vol.29 No.1
The purpose of this study was to identify the priming effects of disaster-related news. Specifically, this study aimed to examine the priming effects about trauma words and neutral words according to the geographical and psychological distance from the disaster. The participants in this study were 75 college students who had not experienced the Daegu subway fire accident, and whom were not ruled out after completing the screening measure completing the screening measure the completion of questionnaires for screening. All participants conducted a lexical decision task after watching a news video about the Daegu subway fire accident. The design was a 2 (Geographical distance: close vs. distant) × 2 (Psychological distance: close vs. distant) × 2 (Priming type: trauma priming vs. neutral priming) mixed-design. The results of this study are summarized as follows: First, the group which was geographically closer to the disaster tended to revealed a largerbigger priming effect than the distant group-a trend toward significance. Second, within the psychologically closer to the disaster, group, for those who were geographically closer too, the priming effect was larger for those who were geographically closer geographically closer than for the geographically distant group. Third, the geographically closer group had a largerbigger neutral priming effect than the distant group. Fourth, the psychologically distant group had a largerbigger neutral priming effect than the close group. To sum up, this study identified that disaster news coverage may have an implicit effect on people, and this influence can change according to the geographical and psychological distance. Finally, this study discussed the limitations of the study and recommendations for further research. 본 연구의 목적은 재난 뉴스의 점화 효과를 확인하는 것이다. 특히 재난과의 지리적 거리와 심리적 거리에따라 외상점화 효과 및 중립점화 효과에서 차이가 나는지를 검증하는 것이었다. 본 연구의 참가자는 대구지하철 화재 사건을 직접 경험한 적이 없고, 스크리닝 설문에서 배제 기준에 해당되지 않는 대학생 75명이었으며, 모든 참가자는 뉴스 동영상을 시청한 후 어휘판단과제를 수행하였다. 설계는 2(지리적 거리) × 2 (심리적 거리) × 2(점화 유형) 혼합 설계를 사용하였다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, 재난으로부터 지리적으로 가까운 집단이 먼 집단에 비해 점화 효과가 큰 경향성을 보였다. 둘째, 재난으로부터 심리적으로 가까운 경우, 지리적으로도 가까운 집단이 지리적으로 먼 집단에 비해 점화 효과가 큰 것으로 나타났다. 셋째, 재난으로부터 지리적으로 가까운 집단이 먼 집단에 비해 중립점화 효과가 크게 나타났다. 넷째, 재난으로부터 심리적으로 먼 집단이 가까운 집단에 비해 중립점화 효과가 크게 나타났다. 요약하면, 재난 뉴스가 사람들에게 암묵적으로 영향을 미칠 수 있으며, 지리적 거리와 심리적 거리에 따라 그 영향이 달라질 수 있음이 확인되었다. 마지막으로, 본 연구의 한계점과 후속연구를 위한 제언이 논의되었다.
전도성 고분자가 코팅된 탄소 나노튜브 투명전극의 특성 분석
김부종,박진석,한상훈 한국반도체디스플레이기술학회 2014 반도체디스플레이기술학회지 Vol.13 No.1
This study demonstrates transparent electrodes with characteristics desirable for touch screen panels using carbon nanotubes (CNTs). This has been accomplished by depositing CNTs on glass substrates via spray coating and then depositing thin conductive polymer films on the CNTs via spin coating. For all of the samples, such as CNTs, conductive polymers, and polymer-coated CNTs, the surface morphologies, sheet resistances, visible transmittances, chromatic properties are characterized as functions of their preparation conditions, such as the spray times for CNTs and the spin speeds for conductive polymers. The experimental results confirm that only the polymer-coated CNTs can satisfy all of the requirements that are required for electrodes of touch screen panels, such as the sheet resistance lower than 100 Ω/sq, the visible transmittance higher than 80 %, and the yellowness smaller than 1.