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전체 선택해제
총 52건 검색
본문검색 결과만 보기
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Device Optimization of N-Channel MOSFETs with Lateral Asymmetric Channel Doping Profiles
Baek. Ki-Ju, Kim. Jun-Kyu, Kim. Yeong-Seuk, Na. Kee-Yeol 한국전기전자재료학회 Transactions on electrical and electronic materials 5 Pages
한국전기전자재료학회 Transactions on electrical and electronic materials 2010, Vol.11 No.1 15-19 (5 pages)
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N-doped ZnO 박막의 미세 구조 특성
이은주, 박재돈, 윤기완, Lee. Eun-Ju, Park. Jae-Don, Yoon. Gi-Wan 한국해양정보통신학회 한국해양정보통신학회논문지 6 Pages
한국해양정보통신학회 한국해양정보통신학회논문지 2009, Vol.13 No.11 2385-2390 (6 pages)
본 연구에서는 C-축 우선 배향 특성을 가지는 N-doped ZnO 박막을 증착하고 그 미세구조의 특성을 분석 비교하였다. ZnO박막은 $N_2O$ 가스 분위기에서 RF reactive magnetron sputtering 시스템을 사용하여 p-Si(100) 웨이퍼 위에 증착되었다. $N_2O$ 가스는 N doping source로 사용되었으며, 전체 가스 유량에 대한 $N_2O$ 가스의 비율 $N_2O/(N_2O+Ar)$과 증착 전력을 증착의 주요 공정 변수로 선택하여 다양한 가스 비율과 증착 전력에 대한 박막의 미세 구조 특성을 비교 분석하였다. 특히, Auger electron spectroscopy (AES)를... -
The Comparison of Property and Visible Light Activity between Bulk and Surface Doped N-TiO2 Prepared by Sol-gel and N2-plasma Treatment
Hu. Shaozheng, Li. Fayun, Fan. Zhiping 대한화학회 Bulletin of the Korean Chemical Society 5 Pages
대한화학회 Bulletin of the Korean Chemical Society 2012, Vol.33 No.1 199-203 (5 pages)
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One-step synthesis of dual-transition metal substitution on ionic liquid based N-doped mesoporous carbon for oxygen reduction reaction
Ulziidelger Byambasuren, Yukwon Jeon, Dorjgotov Altansukh, Yunseong Ji, Yong-Gun Shul 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2016, Vol.17 No.1 8 53-64 (12 pages)
Nitrogen (N)-doped ordered mesoporous carbons (OMCs) with a dual transition metal system were synthesized as non-Pt catalysts for the ORR. The highly nitrogen doped OMCs were prepared by the precursor of ionic liquid (3-methyl-1-butylpyridine dicyanamide) for N/C species and a mesoporous silica template for the physical structure. Mostly, N-doped carbons are promoted by a single transition metal to improve catalytic activity for ORR in PEMFCs. In this study, our N-doped mesoporous carbons were... -
Significant enhancement of critical current density by effective carbon-doping in MgB2 thin films
Ranot. Mahipal, Lee. O.Y., Kang. W.N. 한국초전도저온공학회 Progress in superconductivity and cryogenics : PSAC 4 Pages
한국초전도저온공학회 Progress in superconductivity and cryogenics : PSAC 2013, Vol.15 No.2 12-15 (4 pages)
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$N-TiO_2$ 광촉매의 제조와 광촉매 활성 검토
강영구, 신기석, 안성환, 함현식, Kang. Young-Gu, Shin. Ki-Seok, Ahn. Sung-Hwan, Hahm. Hyun-Sik 한국유화학회 한국유화학회지 7 Pages
한국유화학회 한국유화학회지 2012, Vol.29 No.3 466-472 (7 pages)
가시광선에 감응하는 광촉매를 제조하기 위하여 $TiO_2$에 질소(N)를 도핑하여 $N-TiO_2$를 제조하였다. 제조한 광촉매의 결정성, 입자 형상 및 도핑 상태는 XRD, FE-SEM 및 XPS를 이용하여 조사하였다. 제조한 광촉매의 활성 평가는 메틸렌블루의 광분해로 조사하였다. 제조한 광촉매는 anatase type이었으며, pH가 높을수록 결정화도가 향상되었다. 제조한 광촉매의 입자 크기는 pH 2.0에서 5.42 nm, pH 4.7에서 5.99 nm, pH 9.0에서 7.58 nm로, 입자 크기는 pH가 증가 할수록 약간씩 증가하였다. 광촉매의 활성은 결정화도에... -
Carbon Doping of TiO2 for Visible Light Photo Catalysis - A review
K. Palanivelu, Ji Sun Im, Young-Seak Lee 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2007, Vol.8 No.3 6 214-224 (11 pages)
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Study on urea precursor effect on the electroactivities of nitrogen-doped graphene nanosheets electrodes for lithium cells
Ki-Yong Kim, Yongju Jung, Seok Kim 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 5 40-46 (7 pages)
Nitrogen-atom doped graphene oxide was considered to prevent the dissolution of polysulfide and to guarantee the enhanced redox reaction of sulfur for good cycle performance of lithium sulfur cells. In this study, we used urea as a nitrogen source due to its low cost and easy preparation. To find the optimum urea content, we tested three different ratios of urea to graphene oxide. The morphology of the composites was examined by field emission scanning electron microscope. Functional groups and... -
원소-도핑 광촉매를 활용한 저농도 황화 이메틸 및 이황화 이메틸의 제어
신명희, 조완근, Shin. Myeong-Hee, Jo. Wan-Kuen 한국환경과학회 한국환경과학회지 10 Pages
한국환경과학회 한국환경과학회지 2009, Vol.18 No.11 1215-1224 (10 pages)
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질소가 도핑된 DLC 막의 물성 조사 및 Mo-tip FEA 소자에의 응용
주병권, 정재훈, 김훈, 이윤희, 이남양, 오명환, Ju. Byeong-Gwon, Jeong. Jae-Hun, Kim. Hun, Lee. Yun-Hui, Lee. Nam-Yang, O. Myeong-Hwan 대한전기학회 전기학회논문지. The transactions of the Korean Institute of Electrical Engineers. C/ C, 전기물성·응용부문 4 Pages
대한전기학회 전기학회논문지. The transactions of the Korean Institute of Electrical Engineers. C/ C, 전기물성·응용부문 1999, Vol.48 No.1 19-22 (4 pages)
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Spark Plasma Sintering 법으로 제조한 CoSb3 Skutterudite계 열전소재의 n형 첨가제 효과
이재기, 최순목, 이홍림, 서원선, Lee. Jae-Ki, Choi. Soon-Mok, Lee. Hong-Lim, Seo. Won-Seon 한국재료학회 한국재료학회지 5 Pages
한국재료학회 한국재료학회지 2010, Vol.20 No.6 326-330 (5 pages)
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PLD 기법으로 성장된 n형 TiO2에서 Nb 도너의 활성화 에너지
배효정, 하준석, 박승환, Bae. Hyojung, Ha. Jun-Seok, Park. Seung Hwan 한국마이크로전자및패키징학회 마이크로전자 및 패키징 학회지 4 Pages
한국마이크로전자및패키징학회 마이크로전자 및 패키징 학회지 2014, Vol.21 No.4 41-44 (4 pages)
본 연구에서는 $TiO_2$에 나이오븀 (Nb) 도펀트가 주입되었을 때의 활성화 에너지를 홀 효과 측정 시스템과 온도에 따른 photoluminescence (PL) 실험을 통하여 살펴보았다. Nb 이 도핑 된 n형 아나타제 $TiO_2$ 박막은 pulsed laser deposition (PLD) 기법으로 $SrTiO_3$기판에 성장되었다. 측정 결과, Nb 도너의 활성화 에너지 값은 홀 효과 측정에서는 14.52 meV, PL 측정에서는 6.72 meV로 다소 차이를 보였다. 이 결과는 기존의 어셉터 물질의 활성화 에너지들과는 차이를 나타내고 있으며, 향후 본 연구와 같은 shallow 도너 준위의... -
Biocomposite membranes based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and multiwall carbon nanotubes for gas separation
Mongyoung Huh, Hye Min Lee, Young Soo Park, Seok Il Yun 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 17 116-121 (6 pages)
The development of gas separation membranes is currently an active research area because of the rapidly increasing interest in carbon dioxide capture and hydrogen recovery, which are two of the most important solutions for problems related to energy and the environment [1-4]. Polymer membranes show selectivity in the separation of gases due to differences in the permeability of individual gases through the polymer film [3,4]. Even though advantageous in terms of low cost, the segmental... -
Preparation of gold nanoparticle/single-walled carbon nanotube nanohybrids using biologically programmed peptide for application of flexible transparent conducting films
MinHo Yang, Bong Gill Choi 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 4 26-31 (6 pages)
In this study, we report a general method for preparation of a one-dimensional (1D) arrangement of Au nanoparticles on single-walled carbon nanotubes (SWNTs) using biologically programmed peptides as structure-guiding 1D templates. The peptides were designed by the combination of glutamic acid (E), glycine (G), and phenylalanine (F) amino acids; peptides efficiently debundled and exfoliated the SWNTs for stability of the dispersion and guided the growth of the array of Au nanoparticles in a... -
Waste coffee grounds-derived nanoporous carbon nanosheets for supercapacitors
Min Hong Park, Young Soo Yun, Se Youn Cho, Na Rae Kim, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 8 66-71 (6 pages)
The development of nanostructured functional materials derived from biomass and/or waste is of growing importance for creating sustainable energy-storage systems. In this study, nanoporous carbonaceous materials containing numerous heteroatoms were fabricated from waste coffee grounds using a top-down process via simple heating with KOH. The nanoporous carbon nanosheets exhibited notable material properties such as high specific surface area (1960.1 m2 g?1), numerous redox-active heteroatoms... -
Effect of nitrogen doping and hydrogen confinement on the electronic properties of a single walled carbon nanotube
Bashir Mohi Ud Din Bhat, Jehangir Rashid Dar, Pratima Sen 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2016, Vol.17 No.1 4 29-32 (4 pages)
This paper addresses the effect of dopants on the electronic properties of zigzag (8, 0) semiconducting single walled carbon nanotubes (SWCNTs), using extended H?ckel theory combined with nonequilibrium Green’s function formalism. Through appropriate dopant concentrations, the electronic properties of SWCNTs can be modified. Within this context, we present our ongoing investigation on (8, 0) SWCNTs doped with nitrogen. Quantum confinement effects on the electronic properties of the SWCNTs have... -
Excellent field emission properties from carbon nanotube field emitters fabricated using a filtration-taping method
Dong Hoon Shin, Seung Il Jung, Ki Nam Yun, Guohai Chen, Seok-Gy Jeon, Jung-Il Kim, Cheol Jin Lee 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 10 214-217 (4 pages)
A filtration-taping method was demonstrated to fabricate carbon nanotube (CNT) emitters. This method shows many good features, including high mechanical adhesion, good electrical contact, low temperature, organic-free, low cost, large size, and suitability for various CNT materials and substrates. These good features promise an advanced field emission performance with a turn-on field of 0.88 V/mm at a current density of 0.1 mA/cm2, a threshold field of 1.98 V/mm at a current density of 1 mA/cm2,... -
Effect of microporosity on nitrogen-doped microporous carbons for electrode of supercapacitor
Eun-A Cho, Seul-Yi Lee, Soo-Jin Park 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 9 210-213 (4 pages)
Nitrogen-doped microporous carbons were prepared using a polyvinylidene fluoride/melamine mixture. The electrochemical performance of the nitrogen-doped microporous carbons after being subjected to different carbonization conditions was investigated. The nitrogen to carbon ratio and specific surface area decreased with an increase in the carbonization temperature. However, the maximum specific capacitance of 208 F/g was obtained at a carbonization temperature of 800°C because it produced the... -
Double-walled carbon nanotubes: synthesis, structural characterization, and application
Yoong Ahm Kim, Kap-Seung Yang, Hiroyuki Muramatsu, Takuya Hayashi, Morinobu Endo, Mauricio Terrones, Mildred S. Dresselhaus 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.2 4 77-88 (12 pages)
Double walled carbon nanotubes (DWCNTs) are considered an ideal model for studying the coupling interactions between different concentric shells in multi-walled CNTs. Due to their intrinsic coaxial structures they are mechanically, thermally, and structurally more stable than single walled CNTs. Geometrically, owing to the buffer-like function of the outer tubes in DWCNTs, the inner tubes exhibit exciting transport and optical properties that lend them promise in the fabrication of field-effect... -
Physical-chemical and biological characterization of different preparations of equine chorionic gonadotropin
Rafael Herrera Alvarez, Fabio Luis Nogueira Natal, Maria Teresa Carvalho Pinto Ribela, Beatriz Elane de Almeida, Jo?o Ezequiel d 대한수의학회 Journal of Veterinary Science 7 Pages
대한수의학회 Journal of Veterinary Science 2016, 제 17권 제 4호 4 459-465 (7 pages)
Ovarian stimulation with commercial preparations of equine chorionic gonadotropin (eCG) produces extremely variable responses in domestic animals, ranging from excessive stimulation to practically no stimulation, when applied on the basis of their declared unitage. This study was conducted to analyze four commercial preparations from different manufacturers via reversed-phase HPLC (RP-HPLC) in comparison with a reference preparation and an official International Standard from the World Health... -
저압화학증착을 이용한 실리콘-게르마늄 이종접합구조의 에피성장과 소자제작 기술 개발
심규환, 김상훈, 송영주, 이내응, 임정욱, 강진영, Shim. K.H, Kim. S.H, Song. Y.J, Lee. N.E, Lim. J.W, Kang. J.Y 한국전기전자재료학회 전기전자재료학회논문지 12 Pages
한국전기전자재료학회 전기전자재료학회논문지 2005, Vol.18 No.4 285-296 (12 pages)
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In-situ 도핑된 M/NEMS용 다결정 3C-SiC 박막의 특성
김강산, 정귀상, Kim. Kang-San, Chung. Gwiy-Sang 한국센서학회 센서학회지 4 Pages
한국센서학회 센서학회지 2008, Vol.17 No.5 325-328 (4 pages)
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졸-겔법으로 제조한 Al-doped ZnO 박막의 특성에 관한 연구
김용남, 이승수, 송준광, 노태민, 김정우, 이희수, Kim. Yong-Nam, Lee. Seoung-Soo, Song. Jun-Kwang, Noh. Tai-Min, Kim. Jung-Woo, Lee. Hee-Soo 한국결정성장학회 한국결정성장학회지 6 Pages
한국결정성장학회 한국결정성장학회지 2008, Vol.18 No.1 50-55 (6 pages)
졸-겔 공정을 이용하여 유리기판 위에 Al-doped ZnO(AZO) 박막을 제조하였고, AZO 박막의 특성에 대하여 Al 전구체 종류 및 post-annealing 온도가 미치는 영향에 대하여 고찰하였다. AZO 박막 제조용 졸은 zinc acetate, EtOH, MEA 등을 사용하여 제조하였고, Al doping 을 위한 전구체로는 aluminum nitrate 와 aluminum chloride 를 사용하였다. Sol 내의 Zn 농도는 0.5 mol/l 로 하였고, Al doping 양은 Zn 대비 1 at%로 고정하였다. 유리기판 위에 졸을 spin-coating 한 후 $550^{circ}C$에서 2 시간 동안 열처리한 후, $N_2$와... -
Doping된 Ⅲ-Ⅴ族 化合物 半導體 界面에서 空間電荷效果
천장호, Chun. Jang-Ho 대한전자공학회 전자공학회논문지 5 Pages
대한전자공학회 전자공학회논문지 1990, Vol.27 No.2 93-97 (5 pages)
도핑된 半導體 界面의 界面電荷 近似式과 構造를 提案하였다. III-V族 化合物 半導體인 p-GaP,p-InP,n-GaAs와 <TEXT>$C_sNO_3$</TEXT> 水性 電解質 界面에서 整流現象은 循環電流-電壓特性으로 定性的 解析을 하였다. 半導體 界面의 電流-電壓 特性曲線, 이온 吸着과 電位障壁 過程은 連續循環電壓方法으로 實證하였다. 도핑된 半導體-電解質 界面에서 pn 또는 np 接合構造와 그에 따른 整流形은 空間電荷에 의하여 決定된다. -
고저 접합 에미터 구조를 갖는 $N^+NPP^+$ Si 태양전지의 효율 개선
장지근, 김봉렬 대한전자공학회 電子工學會誌 9 Pages
대한전자공학회 電子工學會誌 1984, Vol.21 No.1 62-70 (9 pages)
비저항이 10Ω-cm, 두께가 13∼15mi1인 <111> oriented, p형 Si기판을 이용하여 N+PP+ BSF 전지와 에미터 영역이 N+N 고저 접합으로 이루어진 N+NPP+ HELEBSF(high low emitter bach surface field) 전지를 설계 제작하였다. 접합형 태양전지의 에미터 영역에서 고저 접합구조가 효율 개선에 미치는 영향을 검토하기 위해 HLEBSF 전지의 N영역을 제외하고는 같은 마스크와 동시 공정을 통해 N+PP-전지와 N+NPP+ 전지의 가영역에서 물리적 파라미터들(불순물 농도, 두께)을 동일하게 만들었다. 100mW/㎠의 인공조명에서 측정한 결과... -
The electrical and heating properties of copper-incorporated graphite fibers fabricated using different ultrasonication techniques
Kyeong Min Lee, Min-Ji Kim, Hanjoo Jo, Sang Young Yeo, Young-Seak Lee 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 15 111-114 (4 pages)
Electrical energy can be converted into heat energy through ohmic joule heating. Metallic materials are typically used in electrical heating elements because of their great electrical conductivity. However, metallic materials have several weaknesses, such as corrosion susceptibility, heavy weight, high manufacturing costs, and electromagnetic wave emissions [1,2]. To resolve these problems, carbon materials with good electrical conductivity, such as carbon fibers, graphite fibers, carbon... -
Preparation of photoresist-derived carbon micropatterns by proton ion beam lithography and pyrolysis
Hui-Gyun Nam, Jin-Mook Jung, In-Tae Hwang, Junhwa Shin, Chang-Hee Jung, Jae-Hak Choi 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 8 55-61 (7 pages)
Carbon micropatterns (CMs) were fabricated from a negative-type SU-8 photoresist by proton ion beam lithography and pyrolysis. Well-defined negative-type SU-8 micropatterns were formed by proton ion beam lithography at the optimized fluence of 1×1015 ions cm?2 and then pyrolyzed to form CMs. The crosslinked network structures formed by proton irradiation were converted to pseudo-graphitic structures by pyrolysis. The fabricated CMs showed a good electrical conductivity of 1.58×102 S cm?1 and a... -
Study on properties of eco-friendly reduction agents for the reduced graphene oxide method
Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 1 1-9 (9 pages)
We studied the basic properties and fabrication of reduced graphene oxide (rGO) prepared using eco-friendly reduction agents in the graphene solution process. Hydrazine is generally used to reduce graphene oxide (GO), which results in polluting emissions as well as fixed nitrogen functional groups on different defects in the graphene sheets. To replace hydrazine, we developed eco-friendly reduction agents with similar or better reducing properties, and selected of them for further analysis. In...
