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"패터닝"

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"패터닝"

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Mass-producible Stepwise Thermal Patterning for Bio-inspired Dry Adhesives
Han Jun Park, Minsu Kim, Songyoung Lee, Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2025;42(10):833-841.
Published online October 1, 2025
DOI: https://doi.org/10.7736/JKSPE.D.25.00008

Dry adhesives inspired by gecko footpads have garnered considerable attention due to their unique features, including strong yet reversible adhesion, self-cleaning properties, and repeatable use. However, scaling these microstructured adhesives from laboratory fabrication to continuous, high-throughput manufacturing poses significant challenges. In this study, we introduce a stepwise thermal patterning system designed for the scalable production of gecko-inspired dry adhesives on flexible substrates. This automated system combines sequential processes such as plate-to-plate micro-molding, rapid thermal curing, demolding, and roll-up of the patterned film. By raising the curing temperature to approximately 180oC and employing an efficient stepwise imprinting method, we achieve fabrication speeds of up to 150 mm/min without compromising pattern accuracy. The system successfully replicates micropillar structures with a diameter of 15 μm and height of 15 μm, featuring 20 μm mushroom-shaped tips on flexible substrates. The resulting dry adhesives demonstrate stable pull-off strengths of 20-23 N/cm² and retain over 83.5% of their initial adhesion after 100,000 attachment–detachment cycles. These findings highlight the potential of our platform for reliable, high-throughput manufacturing of bio-inspired adhesives, paving the way for various industrial applications such as robotic manipulators, pick-and-place electronic assembly, and wearable devices that require repeated, residue-free attachment.

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Emerging Patterning Strategies for Intrinsically Stretchable Conductors: Materials, Architectures, and Device-level Performance
Donghyeon Seo, Seongsik Jeong, Hae-Jin Kim
J. Korean Soc. Precis. Eng. 2025;42(10):789-816.
Published online October 1, 2025
DOI: https://doi.org/10.7736/JKSPE.D.25.00003

Intrinsically stretchable electronics enable seamless integration with dynamic biological tissues and curved surfaces, making them vital for next-generation wearables, biointerfaces, and intelligent robotics. Yet, precise, high-resolution patterning of stretchable electrodes and circuits remains challenging, limiting practical applications. Traditional lithography offers excellent resolution but is hindered by thermal and chemical incompatibilities with soft substrates. Consequently, alternative approaches such as soft lithography, laser-based patterning, printing methods, and electrospray deposition have gained importance. Soft lithography provides an economical, low-temperature option suitable for delicate materials like liquid metals. Laser-based techniques deliver high resolution and design flexibility but require careful parameter tuning for specific substrates. Mask-free printing methods, including direct ink writing and inkjet printing, enable versatile patterning of complex geometries, while electrospray deposition supports precise, non-contact patterning on stretchable surfaces. Collectively, these techniques advance the fabrication of robust stretchable displays, wireless antennas, and bioelectronic interfaces for accurate physiological monitoring. Despite progress, challenges persist, particularly in achieving large-area uniformity, multilayer stability, and sustainable processing. Addressing these issues demands interdisciplinary collaboration across materials science, fluid dynamics, interfacial engineering, and digital manufacturing. This review highlights recent progress and remaining hurdles, offering guidance for future research in stretchable electronics.

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Optimized Microstructures for High Performance Ag/MWCNT/Ecoflex- based Flexible Pressure Sensors
Hyeon Yun Jeong, Jeong Beom Ko
J. Korean Soc. Precis. Eng. 2025;42(8):657-664.
Published online August 1, 2025
DOI: https://doi.org/10.7736/JKSPE.025.065
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.
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Patterning of Functional Nanoparticles Using Solution-based Selective Surface Treatment Process
Chang-Goo Park, Jun-Ho Jeong, Jun-Hyuk Choi, Jihye Lee, Joo-Yun Jung, Sohee Jeon, Eungsug Lee, Dae-Geun Choi
J. Korean Soc. Precis. Eng. 2019;36(11):1051-1057.
Published online November 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.11.1051
The purpose of this study was to develop a selective patterning process with functional nanoparticles, using the selective hydrophobic treatment which can give surface energy differences. It is important to selectively pattern the nanoparticles in solution, to the desired site in a variety of fields such as transparent electrodes, displays, and bio-sensors. Selective hydrophobic treatment can reduce the additional post processes such as cleaning to remove particles unwanted position, which is a drawback of the existing solution process. Various patterns with sub-micron size that can’t be achieved with other solution processes could be fabricated by nanoimprint lithography, selective surface treatment, and a solution coating process. The transparent conductive electrode (TCE) using silver mesh patterns on the flexible substrate created from our study showed 24 Ω of sheet resistance and more than 82% transmittance. To verify the possibility of nano-patterning of various materials, quantum dot (QD) was also patterned by selectively filling. Selective surface treatment technology has significantly improved the filling process of nanoparticles into fine patterns less than 1 μm wide.
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Fabrication of Micro Pattern Through Analysis of Contact Area of the Jet-Circulating Electrodeposition
Haan Kim, Chong Nam Chu
J. Korean Soc. Precis. Eng. 2019;36(6):523-529.
Published online June 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.6.523
In the Jet-Circulating electrodeposition, selective electrodeposition is done using the local circulation of the electrolyte. The Scale of fabricated patterns using the Jet-Circulating electrodeposition is dependent on the contact area between the nozzle and the workpiece surface through the electrolyte circulation. The shape of the electrolyte meniscus determines the contact area. The factors that influence the shape of the meniscus include the electrolyte jetting parameter and the characteristics of the workpiece surface. The jet distances are analyzed based on the shape of the electrolyte meniscus and contact area which is dependent on the jetting pressure and the suction pressure. In order to investigate the effect of contact area on the workpiece surface, the surface is treated using Hexamethyldisilazane spin coating, self-assembled monolayer formation, and Neverwet ® spray coating. The contact angle and the contact area based on the surface treatment methods are analyzed. The width of the copper patterns fabricated through Jet-Circulating electrodeposition are compared. The copper pattern width of the self-assembled monolayer formation surface had reduction of 30% in comparison to the untreated surface.
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Recent Research Trend of Micro Hot-Embossing
Seung-Hyun Lee, Jeongdai Jo, Kwang-Young Kim, Young-Man Choi
J. Korean Soc. Precis. Eng. 2018;35(11):1027-1034.
Published online November 1, 2018
DOI: https://doi.org/10.7736/KSPE.2018.35.11.1027
Micro hot-embossing is a powerful tool in the agile additive manufacturing industry. Its applications include optical components, micro-fluidic devices, MEMS, hydrophobic/hydrophilic surfaces, and energy harvesting devices. To overcome a drawback of low-process speed, the R2R process has been innovated, with novel embossing mechanisms and process optimization. Also, new materials beyond thermoplastic polymers have been applied to develop new devices, or enhance device performance. This review surveys recent progress in micro hot-embossing technology, in terms of new mold fabrication process, process innovation, and various applications.

Citations

Citations to this article as recorded by  Crossref logo
  • Manufacturing Process for Highly Stable Thermal Imprinting Transparent Electrode Using IPL Sintering
    Yunseok Jang
    Journal of the Korean Society for Precision Engineering.2025; 42(1): 75.     CrossRef
  • Finding Ways to Deform Fine Patterns Fabricated by UV Curable Resin
    Woo Young Kim, Su Hyun Choi, Seonjun Kim, Young Tae Cho
    Journal of the Korean Society for Precision Engineering.2020; 37(4): 291.     CrossRef
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  • Crossref
Development of Patterning Process for Copper Nanowire Using LASER
Nguyen Hung Tran, Duong Thanh Hung, Hyun Chul Kim
J. Korean Soc. Precis. Eng. 2017;34(8):581-586.
Published online August 1, 2017
DOI: https://doi.org/10.7736/KSPE.2017.34.8.581
This paper introduces a facile method to enhance the functionality of a patterned metallic transparent conductor through selective laser ablation of the metal nanowire percolation network. By scanning focused nanosecond pulsed laser a on copper nanowire percolation network, the copper nanowires are selectively ablated and patterned without resorting to any conventional chemical etching or photolithography steps. Several arbitrary patterns of copper nanowire transparent conductors are readily created on the percolation network by changing various laser parameters, such as repetition rate and power. Finally, in a few seconds, the copper nanowire electrode is continuously ablated to a 1 × 1 mm square area. This research thereby proves the advantage of the laser fabrication method.
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