• Title/Summary/Keyword: Direct writing

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Direct-Write Fabrication of Solid Oxide Fuel Cell by Robo-Dispensing (로보 디스펜싱을 이용하여 직접묘화방식으로 제조된 고출력 소형 고체산화물 연료전지)

  • Kim, Yong-Bum;Moon, Jooho;Kim, Joosun;Lee, Jong-Ho;Lee, Hae-Weon
    • Journal of the Korean Ceramic Society
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    • v.42 no.6 s.277
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    • pp.425-431
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    • 2005
  • Line Shaped Solid Oxide Fuel Cell (SOFC) with multilayered structure has been fabricated via direct-writing process. The cell is electrolyte of Ni-YSZ cermet anode, YSZ electrolyte and LSM cathode. They were processed into pastes for the direct writing process. Syringe filled with each electrode and electrolyte paste was loaded into the computer-controlled robe-dispensing machine and the paste was dispensed through cylindrical nozzle of 0.21 mm in diameter under the air pressure of 0.1 tow onto a moving plate with 1.22 mm/s. First of all, the anode paste was dispensed on the PSZ porous substrate, and then the electrolyte paste was dispensed. The anode/electrolyte and the PSZ substrate were co-fired at $1350^{\circ}C$ in air atmosphere for 3 h. The cathode layer was similarly dispensed and sintered at $1200^{\circ}C$ for 1 h. All the electrode/electrolyte lines were visually aligned during the direct writing process. The effective reaction area of fabricated SOFC was $0.03 cm^2$, and the thickness of anode, electrolyte and cathode was 20 $\mu$m, 15 $\mu$m, and 10 $\mu$m, respectively. The single line-shaped SOFC fabricated by direct-writing process exhibited OCV of 0.95 V and maximum power density of $0.35W/cm^2$ at $810^{\circ}C$.

Direct Writing Lithography Technique for Semiconductor Fabrication Process Using Proton Beam

  • Kim, Kwan Do
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.1
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    • pp.38-41
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    • 2019
  • Proton beam writing is a direct writing lithography technique for semiconductor fabrication process. The advantage of this technique is that the proton beam does not scatter as they travel through the matter and therefore maintain a straight path as they penetrate into the resist. The experiment has been carried out at Accelerator Mass Spectrometry facility. The focused proton beam with the fluence of $100nC/mm^2$ was exposed on the PMMA coated silicon sample to make a pattern on a photo resist. The results show the potential of proton beam writing as an effective way to produce semiconductor fabrication process.

Development of a Photopolymer-based Flexible Tactile Sensor using Layered Fabrication and Direct Writing (적층조형과 직접주사방식을 결합한 광경화성 수지 기반의 신축성 촉각센서의 제작)

  • Woo, Sang Gu;Lee, In Hwan;Kim, Ho-Chan;Lee, Kyung Chang;Cho, Hae-Yong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.8-14
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    • 2014
  • Many kinds of robots and machines have been developed to replace human laborin industrial and medical fields, as well as domestic life. In these applications, the device sneed to obtain environmental data using diverse sensors. Among such sensors, the tactile sensor is important because of its ability to get information regarding surface texture and force through the use of mechanical contact. In this research, a simple tactile sensor was developed using the direct writing of pressure sensitive material and layered fabrication of photocurable material. The body of the sensor was fabricated using layered fabrication, and pressure sensitive materials were dispensed between the layers using direct writing. We examined the line fabrication characteristics of the pressure sensitive material according to nozzle dispensing conditions. A simple $4{\times}4$ array flexible tactile sensor was successfully fabricated using the proposed process.

Characteristics of Surface Lamination according to Nozzle Position in Liquid Direct Writing SFF (액체 재료 직접주사방식 SFF에서 노즐 위치에 따른 적층 특성)

  • Jung, Hung Jun;Lee, In Hwan;Kim, Ho-Chan;Cho, Hae Yong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.41-48
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    • 2014
  • Direct writing(DW) is a method of patterning materials to a substrate directly, without a mask. It can use a variety of materials and be applied to various fields. Among DW systems, the flow-based type, using a syringe pump and nozzle, is simpler than other types. Furthermore, the range of materials is exceptionally wide. In additive processes, a three dimensional structure is made of stacking layer. Each layer is made of several lines. In this regard, good surface roughness of fabricated layers is essential to three dimensional fabrication. The surface roughness of any fabricated layer tends to change with the dispensing pattern. When multiple layers fabricated by a nozzle dispensing system are stacked, control of the nozzle position from the substrate is important in order to avoid interference between the nozzle and the fabricated layer. In this study, a fluid direct writing system for three dimensional structure fabrication was developed. Experimentsto control the position of the nozzle from substrate were conducted in order to examine the characteristics of the material used in this system.

Direct writing of multi-layer diffraction grating inside fused silica glass by using a femtosecond laser (펨토초 레이저를 이용한 실리카 내부의 다층 회절격자 가공 기술)

  • Choi, Hun-Kook;Kim, Jin-Tae;Sohn, Ik-Bu;Noh, Young-Chul
    • Laser Solutions
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    • v.14 no.3
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    • pp.17-20
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    • 2011
  • We fabricated a multi-layer diffraction grating inside fused silica glass by using a femtosecond laser direct writing method. The femtosecond laser with a wavelength of 515 nm, a pulse width of 250 fs, a repetition rate of 100 kHz, and an average output power of 6 W was used. Two layer diffraction grating with a grating period of $6{\mu}m$ was successfully fabricated with the layer gap of 0.5, 1, 2, 3, and $5{\mu}m$, respectively. Also, we investigated the diffraction pattern by illuminating a He-Ne laser beam. Finally, we demonstrated the diffraction grating with a grating period of $3{\mu}m$ by adjusting the gap of each layer with a grating period of $6{\mu}m$. Femtosecond laser direct writing technology of multi-layer has a potential to fabricate the diffraction grating with a grating period of below $1.5{\mu}m$.

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Study on the stamper mold manufacture and molding of barrier ribs for polymer solar cells using direct writing method (Direct writing 기법을 이용한 유기태양전지용 격벽 stamper 금형 제작 및 성형에 관한 연구)

  • Hwang, C.J.;Kim, J.S;Hong, S.K.;Oh, J.G.;Kang, J.J.
    • Design & Manufacturing
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    • v.2 no.6
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    • pp.28-32
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    • 2008
  • Polymer solar cells are a type of organic solar cell (also called plastic solar cell), or organic photovoltaic cell that produce electricity from sunlight using polymers. It is a relatively novel technology, they are being researched by universities, national laboratories and several companies around the world. In this paper, stamping mold of barrier ribs for polymer solar cells was manufactured by lithography and electroforming which can control the height of pattern and 80nl of barrier ribs was manufactured by using hot embossing.

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