Author: J.Park†, J.Park†, S.Lee, H.Kim, H.Kim, J.Park, T.Yun, J.Lee, S.Kim, H.Jin, K.Parkm H.Kang, H.Kim, H.Jin, J.Kim*, S.Kim*, B.Kim*Title: 2D MoS2 Helical Liquid Crystalline Fibers for Multifunctional Wearable SensorsJournal: Advanced Fiber MaterialsYear: 2024Impact factor: 17.2Abstract:Fiber-based material systems are emerging as key elements for next-generation wearable devices due to their remarkable advantages, including large mechanical deformability, breathability, and high durability. Recently, greatly improved mechanical stability has been established in functional fiber systems by introducing atomic-thick two-dimensional (2D) materials. Further development of intelligent fibers that can respond to various external stimuli is strongly needed for versatile applications. In this work, helical-shaped semiconductive fibers capable of multifunctional sensing are obtained by wet-spinning MoS2 liquid crystal (LC) dispersions. The mechanical properties of the MoS2 fibers were improved by exploiting high-purity LC dispersions consisting of uniformly-sized MoS2 nanoflakes. Notably, three-dimensional (3D) helical fibers with structural chirality were successfully constructed by controlling the wet-spinning process parameters. The helical fibers exhibited multifunctional sensing characteristics, including (1) photodetection, (2) pH monitoring, (3) gas detection, and (4) 3D strain sensing. 2D materials with semiconducting properties as well as abundant surface reactive sites enable smart multifunctionalities in one-dimensional (1D) and helical fiber geometry, which is potentially useful for diverse applications such as wearable internet of things (IoT) devices and soft robotics.

Author: H.Kim†, J.Choi†, I.Bae, H.Son, J.Choi, J.Lee, J.Kim*Title: Functionalized MXene anodes for high-performance lithium-ion batteriesJournal: Journal of alloys and compoundsYear: 2024Impact factor: 5.8Abstract:Investigating the fundamental properties of anode materials is essential for developing lithium-ion batteries (LIBs). Herein, ab initio calculations are used to determine the suitability of MXene M2CTX (M = Sc, Ti, V, Cr, and Mn; TX = Cl, Br, S, Se, O, and Te) sheets as anode materials for LIBs. We revealed that Cr2CSe2 sheet exhibited a Li storage capacity of 391.340 mAh/g, surpassing that of graphite (372 mAh/g). Furthermore, diffusion barrier analysis revealed considerably lower energy barriers (~0.05 eV) for Li-ion diffusion along the C1–A–C2 pathway compared to graphite, demonstrating the potential for enhanced rate and capacity in MXene-based anode materials. These findings provide valuable insights into developing LIBs with enhanced performance.

Author: S.Lee†, H.Lee†, J.Kim, J.Park, S.Kyung, H.Choi, S.Baek, J.Park, S.Park, J.Kim, H.Jo, S.Cho, J.Kim, H.Kim, S.Han*, J.Oh* and B.Kim*Title: Active-type piezoelectric smart textiles with antifouling performance for pathogenic controlJournal: npj flexible electronicsYear: 2024Impact factor: 12.3Abstract:Recently, an investigation into preventive measures for coronavirus disease 2019 (COVID-19) has garnered considerable attention. Consequently, strategies for the proactive prevention of viral pathogens have also attracted significant interest in the field of wearable devices and electronic textiles research, particularly due to their potential applications in personal protective equipment. In this study, we introduce smart textiles designed with optimized piezoelectric devices that exhibit antifouling performance against microorganisms and actively inactivate viruses. These active-type smart textiles, which incorporate advanced lead zirconate titanate (PZT) ceramics, a stretchable interconnector array, and polymeric fabric, demonstrate effective antifouling capabilities, detaching approximately 90% of Escherichia coli and 75% of SARS-CoV-2. Furthermore, they inactivate viruses, releasing ~26.8 ng of N protein from ruptured SARS-CoV-2, using ultrasonic waves within the wearable platform. Experimental results show that piezoelectric smart textiles significantly reduce the spread of COVID-19 by leveraging the electrical and acoustic properties of PZT ceramics.

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