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탄소나노튜브 캐소드에서 표면처리 방법이 전계방출 특성에 미치는 영향
성명석,오정섭,이지언,정승진,김태식,조영래,Seong, Myeong-Seok,Oh, Jeong-Seob,Lee, Ji-Eon,Jung, Seung-Jin,Kim, Tae-Sik,Cho, Young-Rae 한국재료학회 2006 한국재료학회지 Vol.16 No.1
Carbon nanotube cathodes (CNT cathodes) were fabricated by a screen printing method using multi-walled carbon nanotubes. The effects of surface treatment on CNT cathodes were investigated for use in high efficiency field emission displays. The optimum surface treatment for a CNT cathode is dependent on a relative bonding force of CNT films on the cathode after a heat treatment. Because of the high bonding force used in the Liquid method, this method is recommended for CNT cathodes which are heat-treated at $390^{\circ}C$ in a $N_2$ atmosphere. The Rolling method is applicable for CNT cathodes fabricated at $350^{\circ}C$ in an atmosphere of air. The results of this study provide basic criteria for the selection of an appropriate surface treatment for large area CNT cathodes.
성명석,이윤복,김용진,김영석,김양도,Sung, Myoung-Seok,Lee, Yoon-Bok,Kim, Yong-Jin,Kim, Young-Seok,Kim, Yang-do 한국재료학회 2006 한국재료학회지 Vol.16 No.3
Cadmium selenide (CdSe) nanoparticles with the diameter of about 3.4nm have been synthesized from the mixed aqueous solution of distilled water and diethanolamine at room temperature. The cadmium chloride ($CdCl_2$), sodium selenosulfate ($Na_2SeSO_3$) were used as the cadmium and selenium source, respectively. The properties of CdSe nanoparticles were characterized by using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and UV-Vis measurements. CdSe nanoparticles were analyzed to be cubic phase with the absorption excition peaks between 540 and 600 nm. CdSe nanoparticles also showed red-shifted excition peaks with increasing the sonication time. This paper mainly presents the sonication effects on the formation of CdSe nanoparticles prepared from the mixed aqueous solution of distilled water and diethanolamine.
성명석(Sung, MyoungSeok),이윤복(Lee, YoonBok),김형국(Kim, HyongKuk),김양도(Kim, Yangdo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Diethnao lamine(DEA)을 함유한 수용액을 ultrasonic irradiation에 의하여 CdSe 반도체 양자점을 제조하였고 제조된 양자점의 광학적 성질을 조사하였다. CdSe 양자점 제조시 카드뮴을 제공하는 물질로는 CdCl₂{cdot}2.5H₂O를, 셀레늄을 제공하는 물질로는 Se powders를 Na₂SO₃ 수용액에서 90?C, 1시간 reflux 한 Na₂SeSO₃를 사용하였다. 상온에서 고출력의 초음파 조사 (20kHz, 60Wcm^{-2})에 의한 CdSe반도체 양자점을 얻기 위하여 초음파 시간을 각각 변화시켰고 XRD, UV-Vis, PL, TEM, XPS론 사용하여 CdSe 나노 입자의 특성을 분석하였다. CdSe흡수스펙트럼을 분석한 결과 450-640nm범위에서 양자점 형성에 의한 엑시톤 흡수 봉우리가 관찰되었음을 확인할 수 있었다. 또한 초음파 조사시간을 5분, 15분, 30분으로 증가시킴에 따라 505nm, 525nm, 545nm로서 엑시톤의 흡수 파장이 장파장 쪽으로 이동함을 확인함으로써 초음파 조사시간에 따라 CdSe 양자점의 크기를 변화시킬 수 있음을 알 수 있었다.
본딩재료의 성분 변화가 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
신허영,성명석,김태식,오정섭,정승진,이지언,조영래,Shin Heo-Young,Seong Myeong-Seok,Kim Tae-Sik,Oh Jeong-Seob,Jung Seung-Jin,Lee Ji-Eon,Cho Young-Rae 한국재료학회 2005 한국재료학회지 Vol.15 No.11
The effects of change in the component of bonding materials in carbon nanotube cathode (CNT-cathode) on field enhancement and field emission characteristics were investigated. The field enhancement factor$\beta$ was dependent on the electrical conductivity of the bonding materials. The use of frit glass as a bonding material showed a higher field enhancement factor and better field emission characteristics than an Ag paste. The reason for why the frit glass showed better field emission characteristics can be summarized as follows. First, a frit glass improves the real aspect ratio of CNTs compared to an Ag paste. Second, the number of CNTs in CNT-cathodes is considerably reduced because the CNTs were extensively oxidized during $390^{\circ}C$ heat treatment in air atmosphere in the case of Ag paste.
탄소나노튜브의 분산이 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
안병건,성명석,신허영,김동희,김태식,조영래,Ahn B. G.,Seung M. S.,Shin H. Y.,Kim D. H.,Kim T. S.,Cho Y. R. 한국재료학회 2004 한국재료학회지 Vol.14 No.11
The uniformity of emission mage and field emission properties of carbon nanotube(CNT) cathodes dependence on CNT particle dispersion were investigated for field emission displays. We used multi-walled carbon nanotubes (MWNTs) synthesized by CVD method as the field emitter materials. CNT dispersion in CNT ink was carried out by ultrasonication and shaking methods. According to CNT dispersion conditions, the uniformity of emission image and field emission properties of CNT cathodes were greatly affected. The smaller particles of filler materials and CNT powders provide the better properties of the CNT cathodes.