• 한국분말재료학회지
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• 제17권5호
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• pp.390-398
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• 2010

Aqueous gold nanoparticle dispersion was synthesized by chemical reduction method using diethanolamine as reducing agent and polyethyleneimine as dispersion stabilizer. The synthesis conditions for the stable dispersion of the gold nanoparticle suspension were determined by changing the amount of the reducing agent and dispersant during the wet chemical synthesis procedures. The face centered cubic lattice structure of the gold nanoparticles was confirmed by using X-ray diffraction and the morphologies of the nanoparticles were observed by transmission electron microscope. The synthesized gold nanoparticle dispersion was concentrated by evaporating the dispersion medium at room temperature followed by the addition of ethyleneglycol as humectant for the increase of the elastic properties to obtain gold nanoparticle inks for direct ink writing process. The line patterns were obtained with the gold nanoparticle inks during the writing procedures and the morphologies of the fine patterns were observed by scanning electron microscope.

• 한국결정성장학회지
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• 제30권5호
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• pp.174-182
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• 2020

최근 잉크젯 프린팅 기술을 이용한 인쇄전자 분야가 차세대 기술로서 각광받고 있으며, 복수의 프린트 헤드(head)로부터 다양한 잉크 형태의 소재를 정밀하게 출력하여 적층할 수 있는 3D 프린팅 기술에 관한 연구가 활발하게 진행되고 있다. 본 연구에서는 잉크젯 3D 프린팅 기술을 이용하여 광경화성 실리카 잉크와 PVP가 첨가된 나노 구리 잉크로 절연층과 전도층의 복합구조체를 제작하였다. 프린팅 구동 조건과 잉크의 유변학적 거동을 최적화하여 정밀한 광경화 실리카 절연층을 적층 제조하였으며, 절연층의 저항은 2.43 × 10¹³ Ω·cm의 값을 나타내었다. 광경화 실리카 절연층 위에는 액적 간격 제어를 통하여 나노 구리 전도층을 프린팅하였다. PVP 첨가 나노 구리 잉크의 소결은 IPL 광소결 공정을 이용하였으며, 어닐링 온도와 인가 전압 변화에 따른 전기적, 기계적 특성을 확인하였다. 100℃ 어닐링 온도와 700 V IPL 광소결 조건에서 PVP가 첨가된 나노 구리 전도층의 저항은 29 μΩ·cm으로 매우 낮으며, 광경화 실리카 절연층과의 접착력은 매우 우수한 것으로 확인하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1466-1468
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• 2009

The preparation method of copper nanopowder by dry process for conductive ink was investigated. Inert gas condensation method was used to synthesize copper nanopowder. The produced powders was spherical and sized 10~100nm flowing the conditions. The results showed that input voltage and evaporation rate is critical variables for nano-sized copper powder.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.865-867
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• 2009

In this paper, we describe the fabrication of nano-scale ink particles with narrow size distribution to offer high optical density in electrophoretic display applications. Charged white ($TiO_2$ and polyester) and black (carbon black and polyester) nano size ink particles in size range of 200 ~ 700nm were made successively using modified non-aqueous base emulsion process. The EPD showed white reflectance of 58% and saturation voltage of ${\pm}10V$.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.579-580
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• 2011

• 한국세라믹학회지
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• 제41권10호
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• pp.788-791
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• 2004

입자크기가 수 nm인 고농도 은 나노 졸을 이용하여 잉크젯 기법으로 은 미세라인을 형성하고자 하였다. 고분자전해질을 사용하여 합성한 $10wt\%$ 농도의 은 나노 졸의 입자크기는 10nm 이하였으며, 은 나노 졸을 이용한 미세 라인의 인쇄특성은 은 나노 졸의 접촉각에 매우 깊은 관계를 갖고 있었다. 순수한 ITO 기판에서 은 나노 졸은 높은 접촉각을 나타내었으며, dot 형상이 나타났다. 그러나 100ppm의 Polyethylenimine(PEI)을 코팅한 ITO 기판은 젖음성이 크게 개선되었으며, 잉크젯 기법을 이용하여 $60\~100{\mu}m$의 선폭을 갖는 은 나노 졸의 미세라인 형성이 가능함을 확인할 수 있었다.

• 한국분말재료학회지
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• 제18권4호
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• pp.322-326
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• 2011

Inkjet printing was successfully done using Cu nano powder ink after these Cu nano powders were dry-coated with 1-octanethiol for oxidation prevention. 1-octanethiol, which is Self-Assembled Multi-layers (SAMs), was coated approximately 10-nm thick on the surface of Cu nano powders. 1-Octanol, which has the same chain length as that for 1-octanethiol, was used as a solvent to make the ink for inkjet printing. As a result, the fabricated ink was dispersed for about 4 weeks, and after printing and heat treatment at $350^{\circ}C$ for 4 hours, the resistivity for the printed pattern was measured to be $1.15{\times}10^{-5}{\Omega}{\cdot}cm$.

• 한국정밀공학회지
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• 제24권5호
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• pp.89-96
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• 2007

Inkjet printing has become one of the most attractive manufacturing techniques in industry. Especially inkjet printing technology will soon be part of the PCB (Printed Circuit Board) fabrication processes. Traditional printing on PCB includes screen printing and photolithography. These technologies involve high costs, time-consuming procedures and several process steps. However, by inkjet technology manufacturing time and production costs can be reduced, and procedures can be more efficient. PCB manufacturers therefore willingly accept this inkjet technology to the PCB industry, and are quickly shifting from conventional to inkjet printing. To produce the printed circuit board by the inkjet technology, it must be harmonized with conductive nano ink, printing process, system, and inkjet printhead. In this study, micro patterning of conductive line has been investigated using the piezoelectric printhead driven by a bipolar voltage signal is used to dispense 20-40 ${\mu}m$ diameter droplets and silver nano ink which consists of 1 to 50 nm silver particles that are homogeneously suspended in an organic carrier. To fabricate a conductive line used in PCB with high precision, a printed line width was calculated and compared with printing results.

• 한국재료학회지
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• 제24권2호
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• pp.73-80
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• 2014

Ink-jet printing technology has been widely attractive due to its facility for direct and fine printing on various substrates. Recent studies have focused on expanding the application of ink-jet printing technology from general consumer use and design companies to the prototype production of precision parts and parts manufacturing. The use of ink-jet printing technology in decorated tableware, tiles, and other ceramic products also has many advantages. The printing process is fast and can be adaptable to various kinds of objects because there is no direct contact point between the printer and the substrates to be printed. For application to ceramic product decoration, inks containing highly dispersed inorganic nano-pigments are required. Here we report the synthesis and characterization of blue $CoAl_2O_4$ nanopigment for ink-jet printing. Blue ceramic ink based on the obtained $CoAl_2O_4$ pigment was prepared by dissolving $CoAl_2O_4$ pigment in a mixed solution of ethylene glycol and ethanol with volume ratios of 7:3 and 8:2, respectively, to obtain the appropriate viscosity for ink-jet printing. The ink solution contained 15 wt% of $CoAl_2O_4$ pigment and Cetyltrimethyl ammonium bromide(CTAB) and Sodium dodecyl sulfate(SDS) as dispersive agents. The prepared blue ceramic ink was stably jetted and formed a sphere-shaped droplet from an ink-jet printer.

• 한국결정성장학회지
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• 제29권6호
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• pp.345-351
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• 2019

디지털 잉크젯 프린팅 기술은 고해상도, 빠른 인쇄 속도, 높은 잉크 효율과 같은 장점과 함께 다양한 소재 적용이 용이하여 반도체, 디스플레이, 세라믹 타일 등의 산업 분야에서 주목을 받고 있다. 최근에는 전통적인 잉크 소재에서 벗어나 우수한 내열성, 내광성, 내화학성 등을 보이는 기능성 소재도 잉크젯 프린팅 공정에 적용하려는 시도가 활발히 진행되고 있다. 특히 2차원 인쇄뿐만 아니라 3차원 적층인쇄에 관한 연구도 시작되고 있으며 이를 위해서는 토출되는 잉크의 유변학적 물성과 프린트되는 기판과의 상호작용를 제어하는 것이 필수적이다. 본 연구에서는 나노 실리카 입자가 포함된 광경화성 세라믹 잉크를 합성하고 잉크의 물성과 프린팅 기판의 표면특성을 제어하였다. 나노 실리카 입자가 포함된 광경화성 세라믹 잉크의 퍼짐현상을 억제하고 기판과의 접촉각 특성을 개선함으로써 결과적으로 프린팅 해상도 및 적층성을 향상시켰으며 잉크젯 프린팅을 이용한 광경화 나노 실리카 잉크의 3D 프린팅에 대한 가능성을 확인하였다.