KR – Page 16 – TechConnect Briefs

Instability and Dynamics of EHD Flow with Unipolar and Bipolar Charge Injection in an Annulus

Fernandes D.V., Suh Y.K., Dong-A University, KR

Instability of steady-state conduction of a fluid in an annulus between two concentric circular cylinders subjected to charge injection either from the inner or outer and from both cylinder electrodes is considered. The results given [...]

FineMetalLine Patterning on Hydrophilic Non-Conductive SubstratesBased on EHD Printing withLaser Sintering

Son S., Lee S., Kim Y.J., An K., Choi J., Sungkyunkwan University, KR

In this paper, we report the successful EHD printing and laser sintering of a 5 um width of metal line patterns, with the line thickness of over 340 nm, on a hydrophilic non-conductive glass substrate [...]

High Aspect Ratio EHD Printing with High Viscosity Ink Ejection

Choi J., Lee S., Kim Y.J., Son S.U., An K.C., Sungkyunkwan University, KR

EHD (Electro-hydro-dynamics) printing technology, one of the printing technologies based on EHD discharging theory, can be patterning of high resolution and high aspect ratio compared to conventional inkjet printing systems. We have been investigating to [...]

The Effect of Surface Treatment on The Line Formation of Inkjet-Printed Silver Nanoparticles

Moon S.J., Moon Y.J., Kang H.S., Kang K.T., Kang H.S., Kang K.T., Lee S-H., Moon S.J., Moon Y.J., Hwang J.Y., Korea Institute of Industrial Technology(KITECH), KR

Printing technologies have emerged as a promising technique to realize low-cost integrated circuits. Among several printing techniques, drop-on-demand inkjet printing is an attractive tool for low-cost electronics fabrication. Inkjet printing can generate patterns of metal, [...]

The effect of Rheological Property of Ink on the Generation of Inkjet Droplet

Yoo H., Kim C., Korea university, KR

In inkjet printing the ink is usually a suspension of particles in liquid. Suspensions usually have shear-thinning viscosities. Also they have large zero shear viscosities. To understand the jetting and drop generation mechanism we investigated [...]

Micro Patterning of Organic Solvents on OLED Device Using EHD Inkjet Technology

Lee S-H., Nguyen X.H., Jo W., Ko H.S., Sungkyunkwan University, KR

Although there are many modes of the ejection mechanism from the EHD nozzle [2], a cone-jet mode, a pulse-jet mode and a micro-dripping mode have been analyzed by capturing the jetting phenomena using organic solvents [...]

A MEMS-type Micro Sensor for Hydrogen Gas Detection

Yoon J-H, Kim B.-J., Kim J-S, Kim B.-J., Kim J-S, University of Seoul, KR

In this study, a highly sensitive hydrogen gas sensor of the multi-layer and micro-heater type was designed and fabricated using a microelectromechanical system (MEMS) process. The dimension of fabricated hydrogen gas sensor was 5 mm×4 [...]

NH3 sensing properties of centimeter scaled CVD graphene in ambient condition

Lim J., Anoop R., Kim J.H., Kim Y.J., Yoon J., Ahn H-R, Song S., Kim J.H., Kim Y.J., Jun S.C., Yonsei University, KR

The present work reports ammonia (NH3) gas sensing properties of Graphene film synthesized by chemical vapor deposition (CVD) in ambient condition. Graphene with a large area is synthesized on Cu foils by chemical vapor deposition [...]

Topology Optimization of Ultrasonic Transducers for Microsystem and IC Packaging

Kim J-M, Kim J-S, Kim J-M, Kim J-S, Lee S.I., Lim E.J., University of Seoul, KR

In this study, we introduce the method of topology optimization for piezoelectric transducers including ultrasonic tool horns for flip chip or wire bonding. Topology optimization performs an optimization with the objective function regardless of initial [...]

Synthesis of ZnO Nanosheets by Exposing Zn Film to Oxygen Plasma at Low Temperatures

Yoon J-H, Kangwon National University, KR

We report that the well-defined ZnO nanosheets can be synthesized by directly exposing Zn film to oxygen plasma produced by PECVD method using N2O gas at temperatures below 350 oC. FESEM, XRD, TEM, and PL [...]