• Title/Summary/Keyword: Nano-Electronics

검색결과 746건 처리시간 0.032초

나노 인텐테이션을 이용한 산화알루미늄(AAO, Anodic Aluminum Oxide)구조물의 물성치에 대한 연구 (The study on properties of AAO(Anodic Aluminum Oxide) structures using nano indentation)

  • 고성현;이대웅;지상은;박현철;이건홍;황운봉
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.144-149
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    • 2004
  • Porous anodic alumina has been used widely for corrosion protection of aluminum surfaces or as dielectric material in micro-electronics applications. It exhibits a homogeneous morphology of parallel pores which can easily be controlled between 10 and 400nm. It has been applied as a template for fabrication of the nanometerscale composite. In this study, mechanical properties of the AAO structures are measured by the nano indentation method. Nano indentation technique is one of the most effective method to measure the mechanical properties of nano-structures. Basically, hardness and elastic modulus can be obtained by the nano-indentation. Using the nano-indentation method, we investigated the mechanical properties of the AAO structure with different size of nano-holes. In results, we find the hole effect that changes the mechanical properties as size of nano hole.

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마이크로 렌즈 어레이와 회절격자 레지스트 패턴을 이용한 유기광원(OLED)의 광 추출 효율 향상 (Outcoupling Enhancement of OLED using Microlens Array and Diffractive Grating)

  • 장지향;김경조;김진헌;오민철
    • 한국광학회지
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    • 제18권6호
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    • pp.441-446
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    • 2007
  • OLED 소자는 유리기판과 공기 층의 경계면에서 발생하는 전반사와 ITO-유기층으로 형성되는 광도파로를 따라 진행하는 도파모드 결합으로 인해 내부에서 생성된 빛의 80% 이상이 외부로 추출되지 못하게 된다. 본 연구에서는 마이크로 렌즈 어레이와 회절격자 레지스트 층을 이용하여 소자 내부에서 손실되는 빛을 외부로 추출시킴으로써 OLED의 발광효율을 향상시킨다. 마이크로 렌즈 어레이를 이용하여 유리기판-공기 전반사로 인해 내부에 갇히는 빛을 외부로 출력시키고, ITO 와 유기물 사이에 회절격자 레지스트 층을 삽입하여 ITO-유기층 광도파로에 갇힌 빛들을 수직방향으로 추출될 수 있도록 하였다. 제작된 OLED 소자에 전류밀도 $20mA/cm^2$를 인가한 경우, 마이크로 렌즈 어레이를 적용한 OLED에서 22%의 효율 개선을 얻었고, 회절격자 레지스트 층을 가지는 OLED 의 경우 41%의 효율개선을 얻을 수 있었다.

Effect of gas condition on graphene synthesized by rapid thermal chemical vapor deposition

  • Yang Soo Lee;Dong In Jeong;Yeojoon Yoon;Byeongmin Baek;Hyung Wook Choi;Seok Bin Kwon;Do Hun Kim;Young Joon Hong;Won Kyu Park;Young Hyun Song;Bong Kyun Kang;Dae Ho Yoon;Woo Seok Yang
    • Journal of Ceramic Processing Research
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    • 제21권
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    • pp.47-52
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    • 2020
  • Graphene was synthesized using rapid thermal chemical vapor deposition (RT-CVD) equipment designed to produce largearea graphene at high speed. The effects of methane (CH4), argon (Ar), and hydrogen (H2) gases were investigated between 800 ℃ and 1,000 ℃ during heating and cooling in the graphene synthesis process. The findings reveal that multilayer domains increased due to hydrogen pretreatment with increase in temperature. Furthermore, when pretreated with the same gas, it was confirmed that the post-argon-treated sample cooled from 1,000 ℃ to 800 ℃ had a higher ID/IG value than that of the other samples. This result was consistent with the sheet resistance properties of graphene. The sample prepared in methane atmosphere maintained during both the pre-treatment and post-treatment demonstrated the lowest sheet resistance of 787.49 Ω/sq. Maintaining the methane gas atmosphere in the high-temperature region during graphene synthesis by RT-CVD reduced the defects and improved the electrical property.

Molecular Dynamics Simulations of Nanomemory Element Based on Boron Nitride Nanotube-to-peapod Transition

  • Hwang Ho Jung;Kang Jeong Won;Byun Ki Ryang
    • Transactions on Electrical and Electronic Materials
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    • 제5권6호
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    • pp.227-232
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    • 2004
  • We investigated a nonvolatile nanomemory element based on boron nitride nanopeapods using molecular dynamics simulations. The studied system was composed of two boron-nitride nanotubes filled Cu electrodes and fully ionized endo-fullerenes. The two boron-nitride nanotubes were placed face to face and the endo-fullerenes came and went between the two boron-nitride nanotubes under alternatively applied force fields. Since the endo-fullerenes encapsulated in the boron-nitride nanotubes hardly escape from the boron-nitride nanotubes, the studied system can be considered to be a nonvolatile memory device. The minimum potential energies of the memory element were found near the fullerenes attached copper electrodes and the activation energy barrier was $3{\cdot}579 eV$. Several switching processes were investigated for external force fields using molecular dynamics simulations. The bit flips were achieved from the external force field of above $3.579 eV/{\AA}$.

유연·신축성 전자 소자 개발을 위한 은 나노와이어 기반 투명전극 기술 (Recent Trends in Development of Ag Nanowire-based Transparent Electrodes for Flexible·Stretchable Electronics)

  • 김대곤;김영민;김종웅
    • 마이크로전자및패키징학회지
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    • 제22권1호
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    • pp.7-14
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    • 2015
  • Recently, advances in nano-material researches have opened the door for various transparent conductive materials, which include carbon nanotube, graphene, Ag and Cu nanowire, and printable metal grids. Among them, Ag nanowires are particularly interesting to synthesize because bulk Ag exhibits the highest electrical conductivity among all metals. Here we reviewed recently-published research works introducing various devices from organic light emitting diode to tactile sensing devices, all of which are employing AgNW for a conducting material. They proposed methods to enhance the stretchability and reversibility of the transparent electrodes, and apply them to make various flexible and stretchable electronics. It is expected that Ag nanowires are applicable to a wide range of high-performance, low-cost, stretchable electronic devices.

CNT(Carbon Nano Tube) FEL(Field Emission Lamp)용 고전압 구동 회로 (High voltage driver circuit for CNT Field Emission Lamp)

  • 김헌규;노정욱;한상규;홍성수;사공석진
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2007년도 하계학술대회 논문집
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    • pp.359-361
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    • 2007
  • 본 논문은 CNT(Carbon Nano Tube) FEL(Field Emission Lamp)에서 애노드(Anode)-캐소드(Cathode) 구동용 고전압 구동 회로 구현에 관한 것이다. 본 논문에서 제안하는 고전압 DC 전원 회로는 턴비가 높은 고전압 트랜스포머의 Leakage 인덕턴스를 이용하는 Series-Resonant 형태의 Full Bridge 컨버터를 적용하고 고전압 트랜스포머와 Voltage Multiplier를 이용한다. 고전압 트랜스의 절연전압을 줄이기 위해서 두개의 트랜스포머와 Voltage Multiplier를 이용하여 애노드 전극에는 Positive 고전압, 캐소드 전극에는 Negative 고전압을 인가한다. 이 경우 애노드와 캐소드 사이의 아크 방전 시에도 구동 IC 및 스위칭 소자를 보호할 수 있는 장점이 있다.

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Direct Conversion Sintering of Super-hard Nano-polycrystalline Diamond from Graphite

  • Sumiya, Hitoshi;Irifune, Tetsuo
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.1309-1310
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    • 2006
  • High-purity and super-hard nano-polycrystalline diamond has been successfully synthesized by direct conversion from high-purity graphite under static pressures above 15 GPa and temperatures above $2300^{\circ}C$. This paper describes research findings on the formation mechanism of nano-structure and on the contributing factor leading to high hardness.

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Tracking/Erosion Resistance Analysis of Nano-Al(OH)3 Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

  • Kannan, P.;Sivakumar, M.;Mekala, K.;Chandrasekar, S.
    • Journal of Electrical Engineering and Technology
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    • 제10권1호
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    • pp.355-363
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    • 2015
  • HVDC technology has become popular as an economic mode of bulk power transmission over very long distances. Polymeric insulators in HVDC power transmission lines are affected by surface tracking and erosion problems due to contamination deposit, which pose a greater challenge in maintaining the reliability of the HVDC system. In addition, polymeric insulators are also naturally affected by aging due to various environmental stresses, which in turn accelerates the surface tracking and erosion problems. Research works towards the improvement of tracking and erosion resistance of polymeric insulators by adding nano-sized fillers in the base material are being carried out worldwide. However, surface tracking and erosion performance of nano-filled aged polymeric insulators for HVDC applications are not well reported. Hence, in the present work, tracking and erosion resistance of the nano $Al(OH)_3$ filled silicone rubber insulation material has been evaluated under DC voltages at different filler concentrations and aged conditions, as per IEC 60587 test procedures. Leakage current and contact angle measurements were carried out to understand the surface hydrophobicity. Moving average technique was used to analyze the trend followed by leakage current. Water aged specimen shows less tracking resistance when compared with thermal aged specimen. It is observed that nano-filler concentration of 5% is even sufficient to get better tracking/erosion resistance under DC voltages.