https://scholar.dgist.ac.kr/handle/20.500.11750/9971 2026-10-27T07:04:33Z https://scholar.dgist.ac.kr/handle/20.500.11750/60960 Title: Progress in PDMS modification strategies for high-performance triboelectric nanogenerators: design, applications and future perspective Author(s): Inbaraj, Davis Jacob; Gwak, Sujeong; Lee, Ju-Hyuck; Shin, Dong-Wook Abstract: Eco- and bio-friendly polydimethylsiloxane (PDMS) material-based triboelectric nanogenerators (TENGs) have attracted significant attention for applications in energy harvesting, sensing, and self-powered systems. The performance of PDMS-based TENGs is highly dependent on rational material selection and structural engineering within the PDMS matrix. While conventional components such as dielectrics, metals, two-dimensional (2D) materials, and carbon-based fillers have been widely used, there is a growing demand for advanced materials to enhance efficiency and broaden the scope of applications. In this context, a variety of fillers have been explored in PDMS-based TENGs owing to their favorable properties, including biocompatibility, high sensitivity, nontoxicity, and superior electron mobility. These features make them particularly suitable for next-generation energy harvesting technologies. Unlike previous reviews, this work provides an in-depth and systematic overview of PDMS-based TENGs incorporating diverse fillers, with a focus on their impact on triboelectric performance and practical applications. It highlights the influence of these fillers on output efficiency and expands on their use in areas such as energy harvesting, self-powered sensing, human-machine interaction, and wearable devices. The review concludes by outlining current challenges, emphasizing the need for further research, and offering perspectives to guide future developments in this rapidly advancing field. 2026-07-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60902 Title: Large-area kinetic stabilization of metastable R-glycine via meniscus-driven self-assembly with anisotropic piezoelectricity Author(s): Ryu, Yeonkyeong; Lee, Cheoljae; Zhao, Pin; Yeon, Jimin; Choi, Jinsung; Ibrahim, Tijani Okanlawon; Gwak, Sujeong; Gbadam, Gerald Selasie; Moon, Yeongheum; Shin, Dong-Myeong; Lee, Ju Hun; Lee, Ju-Hyuck Abstract: The development of natural piezoelectric biomaterials with tunable structure and functionality is crucial for advancing sustainable and biocompatible technologies in energy harvesting, implantable electronics, and biomedical systems. Glycine, the simplest amino acid classified into alpha, R, and gamma polymorphs, exhibits inherent substantial piezoelectricity at the R-phase structure. However, achieving controllable and scalable R-phase formation remains a key challenge due to its thermodynamic instability. Here, we present a scalable meniscus-guided self-assembly strategy for the large-area fabrication of uniform R-glycine crystals. Precise balancing of solvent evaporation and crystal growth kinetics enables direct crystallization and selective stabilization of the R-phase. This approach further induces pronounced crystallographic alignment, producing highly oriented R-glycine domains. The non-centrosymmetric structure and electromechanical functionality of the aligned crystals are verified by piezoresponse force microscopy (PFM) and second harmonic generation (SHG) analysis. The resulting assemblies demonstrate piezoelectric energy harvesting capability, confirming the potential of R-glycine as a functional piezoelectric material. This work offers a promising step toward enhancing the piezoelectric performance of natural biomaterials with potential implications for future self-powered biomedical applications. 2026-06-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60423 Title: Skin-Integrated Wearable Electronics: A Dual-Interface Perspective Author(s): Dong, Fuying; Han, Chi; Cai, Sheling T.; Lee, Ju-Hyuck; Niu, Simiao Abstract: Skin-integrated wearable electronics enable continuous, medical-grade monitoring and therapy in daily life, but must balance conflicting needs related to mechanics, power, and communication. This review uses a dual-interface approach that separates the sensor–receiver interface, which handles wireless data and energy transfer, from the sensor–skin interface, where physiological signals are converted and mechanical and biological integration occur. We first reviewed wireless connections designed for skin electronics, focusing on Bluetooth Low Energy (BLE), Radio Frequency Identification (RFID)/Near-Field Communication (NFC) systems, and hybrid systems. Next, we examine sensor–skin interfaces ranging from mediated contact layers such as hydrogels for wearable ultrasound and soft conductive electrodes, to skin-conformal direct-contact methods based on structural mechanics, and ultrathin epidermal devices. Finally, we discuss cross-interface coupling, emphasizing how antenna layouts, power budgets, and body-induced RF effects limit mechanical design, and how skin mechanics influence link reliability. We conclude by exploring opportunities in battery-free and energy-autonomous systems, body-coupled communication, and integration with artificial intelligence (AI)-enabled digital health, positioning future electronic skins as soft, networked platforms that are comfortable and reliable. © 2026 The Author(s). SmartSys published by John Wiley & Sons Australia, Ltd on behalf of Youke Publishing Co., Ltd. 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60328 Title: 이온성 폴리우레탄 기반 자가치유 및 생분해성 마찰전기 나노발전소자 Author(s): 이주혁; 주현서 Abstract: 본 발명은 이온성 폴리우레탄 기반 자가치유 및 생분해성 마찰전기 마찰전기 나노발전소자에 관한 것으로, 본 발명의 일실시예에 따른 이온성 폴리우레탄 기반 자가치유 및 생분해성 마찰전기 나노발전소자는 음극성(negative)을 나타내는 마찰 물질로 형성되는 제1 마찰층, 상기 제1 마찰층에 대향하고, 이온성 액체 기반 사슬 연장제의 비율에 따라 양극성(positive), 자가치유 및 생분해성 정도가 제어되는 이온성 폴리우레탄으로 형성되는 제2 마찰층 및 상기 제2 마찰층내 삽입되고, 상기 이온성 폴리우레탄과 금속 물질이 결합된 물질로 형성되며, 상기 제1 마찰층과 상기 제2 마찰층 간의 접촉 마찰에서 발생되는 전자를 생성 및 전달하는 전극층을 포함할 수 있다.