https://scholar.dgist.ac.kr/handle/20.500.11750/812 2026-04-04T14:43:29Z https://scholar.dgist.ac.kr/handle/20.500.11750/59285 Title: Ultra-thin high-resolution transfer-printed breathable electronics for conformal wearable devices Author(s): Choi, Hyeokjoo; Lee, Dongju; Hwang, Sieun; Shin, Juhee; Bae, Jihoon; Jang, Gain; Kwon, Seokhun; Kang, Hyunil; Myeong, Jihyeon; Jeong, Youngtae; Roh, Jong Wook; Lee, Sungwon Abstract: Nanomesh electronics offer remarkable potential for biomedical and human–machine interface applications due to their conformability to nonplanar surfaces, versatile functionality, and long-term reliability. However, existing materials face significant challenges related to surface structure and chemical resistance, resulting in high electrical resistance and complex fabrication requirements. To address these challenges, we present transfer-printed nanomesh electrodes (NEs) produced by integrating fine-patterned 2D electrodes with porous nanomesh. Electrospun thermoplastic-polyurethane nanofibers provide strong adhesion to the electrodes, which generate sufficient force (95.1 mN∙cm−1) to maintain structural integrity and electrical performance. Unlike direct deposition, which requires a minimum thickness of 100nm to achieve 14.12±2 mS, transfer-printed NEs reach 16.91±8.7 mS only with 20nm. Furthermore, our electrodes demonstrate excellent durability under deformation, maintaining stable electrical performance with only a 0.53% change at a bending radius of 1mm. To validate their practical application, we demonstrate a NE-based tactile sensor, which exhibits a conductance change from 0 mS in the normal state to 130 mS upon touch. These results highlight the potential of transfer-printed NEs for next-generation e-skin with fine patterning, high conductivity, and long-term reliability. In addition, our novel method addresses the challenges of manufacturing breathable devices with functionalities extending beyond simple electrodes. 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59253 Title: 초음파 센서를 이용한 방광 모니터링 장치 및 방법 Author(s): 고영휘; 윤영훈; 이성원 Abstract: Provided is a bladder monitoring apparatus including: an ultrasonic sensor module including an ultrasonic sensor configured to transmit an ultrasonic wave toward a front wall of a bladder and receive the reflected ultrasonic wave; a control module configured to measure a passage time interval, calculate distance information, and calculate a volume of the bladder from the distance information and configuration information; and an output module configured to output the bladder volume calculated by the control module. https://scholar.dgist.ac.kr/handle/20.500.11750/59050 Title: BIOELECTRODE HAVING IMPROVED MECHANICAL AND CHEMICAL DURABILITY AND METHOD FOR MANUFACTURING SAME Author(s): 이선학; 정우성; 이선민; 최혁주; 마요한; 이성원 Abstract: The present invention relates to a bioelectrode having excellent breathability and flexibility as well as excellent mechanical and chemical durability and, specifically, to a bioelectrode comprising: an elastic nanofiber mesh sheet including polymer nanofibers formed by electrospinning; a first metal nanowire network impregnated on the elastic nanofiber mesh sheet such that at least a portion thereof is exposed to the outside; and a corrugated layer formed by a second metal located on the first metal nanowire network exposed to the outside. https://scholar.dgist.ac.kr/handle/20.500.11750/59035 Title: Robust, Stretchable, and Flexible Polymer Nanofiber-Based Wearable Platform for Colorimetric and Chemiresistive Dual-Mode Ammonia Gas Sensing Author(s): Kwon, Seokhun; Choi, Hyeokjoo; Kim, Chulsoo; Shin, Juhee; Kim, Kangmin; Noh, Jihwan; Eo, Sungwoo; Lee, Seokwon; Hwang, Hyunsuk; Lee, Sungwon; Kang, Hyunil Abstract: Ammonia (NH3) is the second-most-produced chemical worldwide and has numerous industrial applications. However, such applications pose significant risks, as evidenced by human casualties caused by NH3 leaks or poisoning in confined environments. This highlights the critical need for highly portable and intuitive wearable NH3 sensors. The chemiresistive sensors are widely employed in wearable devices due to their simple structure, high sensitivity, and short response times, but are prone to malfunctioning and inaccurate gas detection because of the corrosion or failure of the sensing material under the influence of humidity, high temperatures, and interfering gas species. Addressing these limitations, a gas-sensing platform with a polymer-based nanofiber structure has been developed, providing flexibility and facilitating efficient transport of NH3 between the colorimetric (bromocresol-green-based) and chemiresistive (poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)-based) sensing layers. This dual-mode design enables reliable NH3 detection. The NH3-sensing performance of each individual layer is comparable to that of the dual-mode gas-sensing platform, which operates effectively even when attached to human skin and in humid environments. Therefore, this study establishes a robust, selective, and reproducible NH3 sensor for diverse applications and introduces an innovative sensor engineering paradigm. 2025-11-30T15:00:00Z