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Jung, Minhun,Noh, Jinsoo,Kim, Junseok,Kim, Donghwan,Cho, Gyoujin American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>Stretchable electronics may open new applications in display, sensors and actuators. To attain the stretchable electronics, the ink formulation should be compatible with elastomeric substrates. Here, we present the formulation of silver nanoparticles and single walled carbon nanotubes (SWNTs) for printing stretchable silver electrodes on the elastomeric substrates. Highly conductive stretchable electrodes can be printed directly on the poly(styrene-b-butadiene-b-styrene) (PSBS) substrates by roll to plate (R2P) gravure printer. During the stretching test, R2P printed silver based stretchable electrodes show the high conductivity of 1000 S cm(-1) at 0.27 wt% of SWNT loading. Furthermore, the resistance of the printed silver electrode was not changed up to 15% of tensile strain.</P>
All-Printed and Roll-to-Roll-Printable 13.56-MHz-Operated 1-bit RF Tag on Plastic Foils
Minhun Jung,Jaeyoung Kim,Jinsoo Noh,Namsoo Lim,Chaemin Lim,Gwangyong Lee,Junseok Kim,Hwiwon Kang,Kyunghwan Jung,Leonard, A.D.,Tour, J.M.,Gyoujin Cho IEEE 2010 IEEE transactions on electron devices Vol.57 No.3
<P>An all-printed rectifier that can provide at least 10 V dc from a 13.56-MHz radio frequency identification (RFID) reader and an all-printed ring oscillator that can generate at least 100 Hz of clock signal to read a 96-bit RFID tag in a second under the dc power provided by the rectifier should first be printable on plastic foils for the realization of roll-to-roll (R2R) printed ultralow cost RFID tags. Here, we describe a practical way to provide all-printed and R2R-printable antenna, rectifiers, and ring oscillators on plastic foils and demonstrate 13.56-MHz-operated 1-bit RF tags. The all-printed and R2R-printable 13.56-MHz 1-bit tags can generate 102.8 Hz of clock signal as the tag approaches the 13.56-MHz RFID reader.</P>
3D printed heater and sensor fabrication by Reverse-offset printing process using soft blanket
Minhun Jung(정민훈),Hyunha Lee(이현아),Dong Soo Kim(김동수) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This paper is about 3D shape heater with the embedded heating element using 4D printing technology including 3D and 2D printing processes. The shape of the 3D shape heater with the embedded heating element was printed using a fused deposition modeling (FDM) 3D printer. The 2D printing process used an aerosol jet printer, and the printer of the non-contact method was printed a line width of 1mm using conductive silver ink. It was used the conductive silver ink of viscosity of 10,000cP, silver content of 87wt%, and conductivity of 10 to 50uΩ·cm. In this study, it was fabricated a100% printed 3D shape heater with the embedded heating element including a heating temperature of 60°C at 5V using conductive silver ink and 4D printing process. In additional, we have also succeeded in printing wide and flat patterned layers onto curved surfaces using silver nanoparticle inks by a developed reverse-offset printing process. The printed interdigitated electrodes (IDE) for curved humidity sensor are also characterized by uniform thicknesses and low resistivities, equivalent to those of layers printed on planar substrates. Finally, we have demonstrated humidity sensor on curved object surface using sensing material of cellulose nanofiber.
Fully Gravure-Printed D Flip-Flop on Plastic Foils Using Single-Walled Carbon-Nanotube-Based TFTs
Noh, J,Minhun Jung,Kyunghwan Jung,Gwangyong Lee,Joonseok Kim,Soyeon Lim,Daae Kim,Youngchul Choi,Yoonjin Kim,Subramanian, V,Gyoujin Cho IEEE 2011 IEEE electron device letters Vol.32 No.5
<P>Since D flip-flop is one of the indispensable building blocks in integrated circuit (IC) design, providing a successful way to print D flip-flop on plastic foils will be the first step to reach fully printed flexible IC. Here, the network structure of single-walled carbon nanotubes (SWNTs) as an active layer has been employed to print the driver and load thin-film transistors (TFTs) of the D flip-flop. The same physical dimensions of driver and load TFTs were first developed to fully gravure print the D flip-flop because of the advantage of tunable electrical properties of network density of SWNTs. Therefore, the circuit design and printing becomes simpler and more convenient than using general design rules. Furthermore, the SWNT network structure in the active layer can also minimize the fluctuation of threshold voltages (<I>V</I><SUB>th</SUB>) of SWNT-TFTs because of the use of the same physical dimensions in TFTs. The resulting gravure-printed D flip-flop shows a clock-to-output delay of 23 ms for 20-Hz clock signal. This is the first reported D flip-flop performance using all gravure-printing method yet achieved.</P>