미세전극 패터닝 기술을 이용한 바이오센서 패턴 구현

고정범(Jeong Beom Ko),김형찬(Hyung Chan Kim),양영진(Young Jin Yang),김현범(Hyun Bum Kim),양성욱(Seong Wook Yang),오승호(Seung Ho Oh),도양회(Yang Hoi Doh),최경현(Kyung Hyun Choi) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.6

The Biosensor biosensor pattern was developed by via an EHD (electro-hydro-dynamics (EHD) patterning process that was performed under atmospheric pressure at room temperature in a single step. The drop diameter was smaller than nozzle diameter and applied high viscosity conductive ink was applied in the EHD patterning method to provide a clear advantage over the piezo and thermal inkjet printing techniques. The Biosensor’s biosensor’s micro electrode pattern was printed by via a continuous EHD patterning method using 3three- type types of control parameters parameter (input voltage, patterning speed, nozzle pressure). High viscosity (1000 cps) conductive ink with 75 wt% of silver nanoparticles was used for experimentation. The incremental result of impedance of biosensor impedance was measured between the antibody (10 ugμg/ml) to spore (0.1 ng/ml, 10 ng/ml, and 1 ugμg./ml) reaction at frequency 493 MHz frequency.

증강현실을 이용한 실내가구 인테리어 AR레이블링 모델에 대한 연구

고정범(Jeong-Beom Ko),김재웅(Jae-Woong Kim),이윤열(Yun-Yeol Lee),채의근(Yi-Geun Chae),김준용(JoonYong Kim) 한국컴퓨터정보학회 2022 한국컴퓨터정보학회 학술발표논문집 Vol.30 No.2

고점도 전도성 잉크 패터닝 기술을 이용한 고성능 미세전극 패턴 구현

고정범(Jeong Beom Ko),김형찬(Hyung Chan Kim),당현우(Hyun Woo Dang),양영진(Young Jin Yang),최경현(Kyung Hyun Choi),도양회(Yang Hoi Doh) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.1

EHD (electro-hydro-dynamics) patterning was performed under atmospheric pressure at room temperature in a single step. The drop diameter smaller than nozzle diameter and applied high viscosity conductive ink in EHD patterning method provide a clear advantage over the piezo and thermal inkjet printing techniques. The micro electrode pattern was printed by continuous EHD patterning method using 3-type control parameters (input voltage, patterning speed, nozzle pressure). High viscosity (1000cps) conductive ink with 75wt% of silver nanoparticles was used. EHD cone type nozzle having an internal diameter of 50μm was used for experimentation. EHD jetting mode by input voltage and applied 1st order linear regression in stable jet mode was analyzed. The stable jet was achieved at the amplitude of 1.4~1.8 kV. 10μm micro electrode pattern was created at optimized parameters (input voltage 1.6kV, patterning speed 25mm/sec and nozzle pressure -2.3kPa).

메니스커스 제어를 위한 정전기력 헤드용 공압 잉크공급장치 개발

양영진(Young Jin Yang),고정범(Jeong Beom Ko),당현우(Hyun Woo Dang),김형찬(Hyung Chan Kim),최경현(Kyung Hyun Choi),조경호(Kyung Ho Cho) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.4

The Electrostatic Inkjet system has many applications in cost and time effective manufacturing of printed electronics like RFIDs, OLEDs and flexible displays etc. This paper presents pneumatic ink supply system for an electrohydrodynamic deposition (EHD) setup for the precise pressure control to produce a small amount of discharge at the end of the capillary. The meniscus shape depends upon the applied pneumatic pressure to the ink supply system. Furthermore, this paper also compares meniscus shapes at different applied pneumatic pressures. It is concluded that patterning of constant line-width can be achieved better by controlling the meniscus shape using this technique.

R2R 미세선폭 인쇄용 ESD(Electro-Static Deposition) 기술 개발

최경현(Kyung Hyun Choi),고정범(Jeong Beom Ko),김형찬(Hyung Chan Kim),김동수(Dong Soo Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6

Optimized Microstructures for High Performance Ag/MWCNT/Ecoflex- based Flexible Pressure Sensors

정현윤(Hyeon Yun Jeong),고정범(Jeong Beom Ko) Korean Society for Precision Engineering 2025 한국정밀공학회지 Vol.42 No.8

Recently, flexible pressure sensors featuring enhanced sensitivity and durability through nano/micro additive manufacturing have been employed in various fields, including medical monitoring, E-skin technology, and soft robotics. This study focuses on the fabrication and verification of an interdigitated electrode (IDE) based flexible pressure sensor that incorporates microstructures, utilizing a direct patterning-based additive process. The IDE-patterned sample was designed with a total size of 7.95 × 10 mm2, a line width of 150 µm, a spacing of 200 µm, and a probe pad measuring 1.25 × 2 mm2. It was fabricated using AgNP ink on a primed 100 µm thick polyethylene naphthalate (PEN) substrate. The electrode layer was subsequently covered with a sensing layer made of a MWCNT/Ecoflex composite material, resulting in the final pressure sensor sample. Measurements indicated that the sensor exhibited good sensitivity and response speed, and it was confirmed that further improvements in sensitivity could be achieved by optimizing the size, spacing, and height of the microstructures. Building on the flexible pressure sensor structure developed in this study, we plan to pursue future research aimed at fabricating array sensors with integrated circuits and exploring their applicability in wearable devices for pressure sensing and control functions.

스프레이 프린팅 기반 포토다이오드 제작 연구

정재경(Jae-Kyung Jeong),김수완(Soo Wan Kim),김현범(Hyeon Beom Kim),고정범(Jeong Beom Ko),도양회(Yang-Hoi Doh),박성현(Sung Hyun Park) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.5

Effect of flow rate in the generation of printed line in electrostatic inkjet system

Ahsan Rahman(아산 라만),Jeong-Beom Ko(고정범),Hyung-Chan kim(김형찬),Su-Jin Kim(김수진),Khalid Rahman(카리드 래만),Asif Ali(아시프 알리),Bong-Su Yang(양봉수),Adnan Ali(아드난 알리),Yang-Hoi Doh(도양회),Kyung-Hyun Choi(최경현),Dong-Won Je 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-

The Electrostatic Inkjet system has a huge number of applications in cost and time effected manufacturing of printed electronics like RFID, flexible display, solar cell, sensors, batteries etc. So, the fundamental focus will be to investigate the drop generation phenomena by applying the electrostatic forces. Electrostatic inkjet printing for printed electronics technology is advancing rapidly but it s still in its infancy as inkjet printing system is not able to design complicated devices. This paper explains the behavior of the multiphysics phenomena of the Drop on Demand (DOD) electrostatic Inkjet system for printed electronics devices.

MWCNT/PEDOT:PSS 기반 습도센서 제작을 위한 EHD 패터닝 공정 연구

정현윤(Hyeon-Yun Jeong),양영진(Young-Jin Yang),고정범(Jeong-Beom Ko) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.10

Currently, the EHD patterning technology is applied to a wide range of sensor applications, such as temperature and humidity sensors, using various functional materials. In this study, we optimized the EHD patterning process for AgNPs and MWCNT/PEDOT:PSS materials to fabricate a resistive humidity sensor based on Ag-MWCNT/PEDOT:PSS. After implementing the line patterns using a multihead direct patterning device, we optimized the linewidth values according to the control conditions of the process variables. Based on the optimized process conditions, we printed the AgNP electrode layer pattern and MWCNT/PEDOT:PSS sensing layer to fabricate an all-printed humidity sensor. The fabricated humidity sensor exhibited a sensitivity of 12.13 Ω/%RH in the relative humidity range of 30%–90% RH. The humidity sensor fabricated through the optimized EHD patterning process can be efficiently applied to a wide range of applications, including industrial applications and in the food and medical fields.

용액 미립화공정 기반의 마이크로 스텐실 프린팅에 관한 연구

당현우(Hyun Woo Dang),김형찬(Hyung Chan Kim),고정범(Jeong Beom Ko),양영진(Young Jin Yang),양봉수(Bong Su Yang),최경현(Kyung Hyun Choi),도양회(Yang Hoi Doh) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.6

In this study, experiments were conducted for micro pattern printing to combine solution atomization process and stencil printing based on electrospray deposition. The stencil mask fabricated by etching the photosensitive glass placed below 0.3 mm distance to substrate has 100 um line width. The process parameters of electrospray deposition system for the atomization of the solution are applied voltage and supply flow rate of the solution. Meniscus angle of cone-jet was optimized by varying the supply flow rate from 0.3 ml/hr to 0.7 ml/hr. Voltage condition was verified having symmetric cone-jet angle and no pulsation at 8.5 kV applied voltage. In addition, a number of micro patterns are printed using a single 1 step process by solution atomization process. Variable line width of approximate 100 um was confirmed by changing conditions of solution atomization regardless of the pattern size of stencil mask.