• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1806-1809
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• 2008

Study that form micro pattern by direct ink jet printing method is getting attention recently. Direct ink jet printing spout fine droplet including nano metal particle by force or air pressure. There is reason which ink jet printing method is profitable especially in a various micro-patterning technology. It can embody patterns directly without complex process such as mask manufacture or screen-printing for existent lithography. In this study, research of a technology that ejects fine droplet form of Pico liter and forms metal micro pattern was carried with inkjet head of piezoelectricity drive system. Droplet established pattern while ejecting consecutively and move on the surface at the fixed speed. Patterns formed in ink are mixed with organic solvent and polymer that act as binder. So added thermal hardening process after evaporate organic solvent at isothermal after printing. I executed high frequency special quality estimation of CPW transmission line to confirm electrical property of manufactured circuit board. We tried a large area printing to confirm application possibility of an ink jet technology.

• Journal of Fashion Business
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• v.16 no.2
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• pp.138-150
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• 2012

Nano Inkjet DTP technology, a new technology introduced recently, can be applied to various types of fabric, and pre-treatment process can be omitted, which makes the whole printing process compact. Some important factors for DTP are color difference between the color selected by the designer on PC and the color on the final product and durability of the final fabrics. In this study, the twenty-three trend colors of 2012-2013 F/W suggested by PeclersParis have been picked to be printed on cotton, silk and polyester fabrics, then K/S and ${\Delta}E$ value and color fastness were measured. The results show that dyeability of fabric is varied for each color group, and that also tone of color affect to dyeability when measured for colors in the same group. In general, for all fabric, light fastness, washing fastness and color fastness to sublimation are outstanding. However, because of poor rubbing fastness, additional treatment to fix colorant on fabric is required.

• Journal of Aerospace System Engineering
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• v.13 no.4
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• pp.37-42
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• 2019

The objective of this study was to study the bending characteristics of Ag nano ink using EHD (Electrohydrodynamics) inkjet printing technology for flexibility and miniaturization of devices. The optimal conditions for the technology were derived, and bending characteristics of the Ag nano circuit obtained. For the EHD printing, it is essential to find the optimal point for each parameter such as material characteristics, density, flow rate, voltage, discharge height etc. Therefore, it was derived as the point from the working height and the applied voltage. Also, bending characteristics are confirmed by measuring resistance with each radius of curvature using a fabricated bending module. It was confirmed that rate of resistance change increases rapidly as the radius of curvature increases.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1326-1327
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• 2011

결정질 태양전지 제작 시 실리콘 기판 표면의 전극형성은 주로 스크린 프린트를 이용하여 형성되고 있다. 이는 squeeze 와 실리콘 기판과의 직접 접촉으로 인하여 기판의 파손이 야기 될 수 있으며, 보다 미세한 전극 형성이 어려운 단점이 있다. 본 연구에서는 비접촉식 잉크젯 프린팅을 이용한 태양전지의 전극형성에 관하여 기술하였으며, 고효율 태양전지를 제작하기 위해 레이저를 이용한 grooving 형성과 전극의 패턴에 따른 반사방지막층 제거를 통하여 Buried contact cell 제작을 연구하였다. 이를 통해 전극의 선 폭을 $45{\mu}m$로 구현하였으며, 나노 크기의 입자 형태를 띤 Ag 잉크를 이용하여 인쇄하였다.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.446-450
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• 2007

It is strongly expected that inkjet printing method will be play and important role on printable electronics such as 3D integration of embedded ceramic devices(capacitor, resistor, inductor and electrode or circuit), Si-TFT and organic TFT including display C/F, RFID, FPCB, and etc. A inkjet printing method had been center of attention to strengthen the competitiveness of flat panel display on market and to open the new world of manufacturing process of printable electronics. We will survey the industrial tendency of printable electronics and flat panel display including some examples of inkjet printing and present the considerable points of inkjet printing method and some role of materials for successful inkjet printing.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1553-1555
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• 2008

Super-hydrophobic treated Polyimide film was used as a flexible substrate for developing a new method of metallization. Hydrophilic patterns were fabricated by IN irradiation through shadow mask. Patterned super-hydrophobic substrate was dipped into a bath containing silver nano ink Silver ink was only coated on hydrophilic patterned area. Metal lines of $600{\mu}m$ pitch were fabricated successfully. However, their thickness was too thin to serve as interconnection. To overcome this problem, iterative dipping was conducted. After repeating five times, the thickness of silver metal lines were increased to over than $2{\mu}$. After heat treatment of silver lines, their resistivities were reduced to order of $30{\mu}{\Omega}$-cm the similar level of values reported in other literatures. So, a new method of metallization has high potential for application of RFID antenna and flexible electronics substrates.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.252-252
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• 2014

투명전극 제조에 이용되고 있는 진공기반 ITO공정의 제조 단가를 줄이기 위하여 용액 기반의 투명전극 제조 기술에 대한 연구를 수행 하였다. 용액공정을 수행하기 위하여 ITO 나노입자를 이용한 잉크를 제조하고 이를 잉크젯 인쇄공정에 적용하여 ITO 투명전극을 제조하였다. 열처리 온도에 따른 전기적 광학적 특성에 대한 분석을 진행하였다. 전기적 물성의 극대화를 위해 Ag metal grid를 인쇄공정을 통해 제작하고 용액기반 ITO 박막과 융합화(hybridization) 시켰다. Ag metal grid의 line width를 최소화 하기 위하여 전기수력학 방식의 잉크젯 시스템을 사용하여 metal grid를 형성하였고 Ag metal grid는 약 10um의 선폭을 가졌다. 인쇄된 Ag-grid/ITO 박막의 경우 550 nm파장에서(Ag grid pitch: 500 um기준) 약88%의 투과도를 보이며 저항이 $5{\Omega}/{\square}$ 이하의 특성을 나타내었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.329-329
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• 2008

Silver nanoparticles were synthesized by polyol process and its particle size observed with TEM is about 20nm. Silver nanoparticle ink with metal content of 30wt% was prepared using solvent of ethanol and has low viscosity of 5cps (10rpm). This ink was printed by as ink-jet printer on Al2O3 and Silicone substrate. The resistivity and morphology of the printed film was investigated as a function of sintering termperature.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1446-1447
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• 2006

Electronics 분야에서 잉크젯 프린팅 배선 제작에 많이 사용되는 전도성 은 나노 잉크의 소성 특성을 연구하였다. 잉크젯 프린터를 이용하여 미세 배선을 인쇄하고, 열처리에 따른 비저항의 변화 양상을 관찰하였다. SEM을 통해 미세구조를 관찰하여 배선의 전기 저항과 미세 구조와의 상관관계를 고찰하였다. $250^{\circ}C$ 20분 동안 소성을 하였을 매 가장 낮은 비저항을 얻었으며 순수 은의 비저항 대비 약 2.6배였다. 또한 TEM을 통해 배선 내부의 pore를 관찰하였고, 그 분포올를 측정하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.559-560
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• 2006

Inkjet Printing is very attractive method for direct patterns with no masks, In order to Achieve direct printing with nano metal, It is often necessary to print them with highly concentrated Ink We research the High Concentrated silver nano ink. Formulation which has a good thermal stability and storage stability and jet stability using a ethylene glycol ether. Normally Alcohol-based inks can be sensitive But High boiling point ethylene glycol ether base Ink is creating a stable meniscus and minimum maintenance issues. We are reaching a 50~60wt% high Silver Ink using a Hydrophilic Ag Nano powder. (30~50nm)