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Your search keyword '"Lim, Seung-Ju"' showing total 42 results
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42 results on '"Lim, Seung-Ju"'

7. Durable and Washable Sheath/Core-Type Polyamide 6-Rhyk/Pp Colorimetric Bicomponent Fiber Sensor for Hazardous Acidic Gas Detection

Author

Oh, Hyun Ju, primary, Park, Young Ki, additional, Bae, Jong Hyuk, additional, Lim, Jeeyoung, additional, Lee, Seung Jin, additional, kim, Do-Kun, additional, Jang, Seongjin, additional, Yeang, Byeong Jin, additional, Lee, Heedong, additional, Lim, Seung Ju, additional, Lee, Woosung, additional, and Hahm, Wan-gyu, additional

Published
2023
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16. Washable Colorimetric Nanofiber Nonwoven for Ammonia Gas Detection

Author

Oh, Hyun Ju, primary, Yeang, Byeong Jin, additional, Park, Young Ki, additional, Choi, Hyun Jung, additional, Kim, Jong H., additional, Kang, Young Sik, additional, Bae, Younghwan, additional, Kim, Jung Yeon, additional, Lim, Seung Ju, additional, Lee, Woosung, additional, and Hahm, Wan-Gyu, additional

Published
2020
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18. A Highly Porous Nonwoven Thermoplastic Polyurethane/Polypropylene-Based Triboelectric Nanogenerator for Energy Harvesting by Human Walking

Author

Oh, Hyun Ju, primary, Bae, Jong Hyuk, additional, Park, Young Ki, additional, Song, Jinkyu, additional, Kim, Do Kun, additional, Lee, Woosung, additional, Kim, Minhee, additional, Heo, Ki Joon, additional, Kim, Yoonjin, additional, Kim, Seong Hun, additional, Yeang, Byeong Jin, additional, and Lim, Seung Ju, additional

Published
2020
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40. Colorimetric Textile Sensor for the Simultaneous Detection of NH 3 and HCl Gases.

Author

Park, Young Ki, Oh, Hyun Ju, Bae, Jong Hyuk, Lim, Jee Young, Lee, Hee Dong, Hong, Seok Il, Son, Hyun Sik, Kim, Jong H., Lim, Seung Ju, and Lee, Woosung

Subjects
HAZARDOUS substances, DETECTORS, GAS leakage, ELECTROTEXTILES, NATURAL dyes & dyeing, GASES, FIRE detectors, FIREPROOFING agents
Abstract

For the immediate detection of strong gaseous alkalis and acids, colorimetric textile sensors based on halochromic dyes are highly valuable for monitoring gas leakages. To date, colorimetric textile sensors for dual-gas detection have usually been fabricated by electrospinning methods. Although nanofibrous sensors have excellent pH sensitivity, they are difficult to use commercially because of their low durability, low productivity, and high production costs. In this study, we introduce novel textile sensors with high pH sensitivity and durability via a facile and low-cost screen-printing method. To fabricate these textiles sensors, Dye 3 and RhYK dyes were both incorporated into a polyester fabric. The fabricated sensors exhibited high detection rates (<10 s) and distinctive color changes under alkaline or acidic conditions, even at low gas concentrations. Furthermore, the fabricated sensors showed an outstanding durability and reversibility after washing and drying and were confirmed to contain limited amounts of hazardous materials. Thus, our results show that the fabricated textile sensors could be used in safety apparel that changes its color in the presence of harmful gases. [ABSTRACT FROM AUTHOR]

Published
2020
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41. Fabrication of piezoelectric poly(l-lactic acid)/BaTiO3 fibre by the melt-spinning process.

Author

Oh, Hyun Ju, Kim, Do-Kun, Choi, Young Chan, Lim, Seung-Ju, Jeong, Jae Bum, Ko, Jae Hoon, Hahm, Wan-Gyu, Kim, Sang-Woo, Lee, Yongju, Kim, Hyeok, and Yeang, Byeong Jin

Subjects
PIEZOELECTRIC materials, PIEZOELECTRIC ceramics, POLYLACTIC acid, FABRICATION (Manufacturing), METAL fibers, MELT spinning, ELECTRIC properties of barium titanate, PHASE transitions
Abstract

Poly(l-lactic acid) (PLLA) based piezoelectric polymers are gradually becoming the substitute for the conventional piezoelectric ceramic and polymeric materials due to their low cost and biodegradable, non-toxic, piezoelectric and non-pyroelectric nature. To improve the piezoelectric properties of melt-spun poly(l-lactic acid) (PLLA)/BaTiO3, we optimized the post-processing conditions to increase the proportion of the β crystalline phase. The α → β phase transition behaviour was determined by two-dimensional wide-angle x-ray diffraction and differential scanning calorimetry. The piezoelectric properties of PLLA/BaTiO3 fibres were characterised in their yarn and textile form through a tapping method. From these results, we confirmed that the crystalline phase transition of PLLA/BaTiO3 fibres was significantly enhanced under the optimised post-processing conditions at a draw ratio of 3 and temperature of 120 °C during the melt-spinning process. The results indicated that PLLA/BaTiO3 fibres could be a one of the material for organic-based piezoelectric sensors for application in textile-based wearable piezoelectric devices. [ABSTRACT FROM AUTHOR]

Published
2020
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42. Methylammonium Iodide-Mediated Controlled Crystal Growth of CsPbI 2 Br Films for Efficient and Stable All-Inorganic Perovskite Solar Cells.

Author

Kim KS, Jin IS, Park SH, Lim SJ, and Jung JW

Abstract

A high-quality perovskite film is a key aspect contributing to high photovoltaic performance of all-inorganic perovskite solar cells. We herein demonstrate that the addition of methylammonium iodide (MAI) influences effectively both the tailored film morphology and precise crystal growth to construct high-quality CsPbI 2 Br films. It is found that an MAI additive retards the crystallization kinetics to control the inorganic perovskite films to form a highly crystalline α-CsPbI 2 Br structure consisting of microsized grains with reduced defect density. The optimal MAI additive (10 wt %) achieves a power conversion efficiency (PCE) of 10.40% for the CsPbI 2 Br-based all-inorganic perovskite solar cells, which is >30% enhancement from 6.95% of the pristine one. The solar cells employing the MAI additive possess high operational and thermal stability, retaining >70% of the original PCE after aging for 1500 h in ambient atmosphere and under continuous heating at 85 °C for 30 h, respectively. The photovoltaic performance with an indoor light source was also examined using a white light-emitting diode (6500 K, 1000 lux), showing promising PCEs of 23.51% with a stabilized power output of 21.15%.

Published
2020
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